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Herczeg M, Demeter F, Nagy T, Rusznyák Á, Hodek J, Sipos É, Lekli I, Fenyvesi F, Weber J, Kéki S, Borbás A. Block Synthesis and Step-Growth Polymerization of C-6-Sulfonatomethyl-Containing Sulfated Malto-Oligosaccharides and Their Biological Profiling. Int J Mol Sci 2024; 25:677. [PMID: 38203849 PMCID: PMC10779578 DOI: 10.3390/ijms25010677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 12/30/2023] [Accepted: 12/31/2023] [Indexed: 01/12/2024] Open
Abstract
Highly sulfated malto-oligomers, similar to heparin and heparan-sulfate, have good antiviral, antimetastatic, anti-inflammatory and cell growth inhibitory effects. Due to their broad biological activities and simple structure, sulfated malto-oligomer derivatives have a great therapeutic potential, therefore, the development of efficient synthesis methods for their production is of utmost importance. In this work, preparation of α-(1→4)-linked oligoglucosides containing a sulfonatomethyl moiety at position C-6 of each glucose unit was studied by different approaches. Malto-oligomeric sulfonic acid derivatives up to dodecasaccharides were prepared by polymerization using different protecting groups, and the composition of the product mixtures was analyzed by MALDI-MS methods and size-exclusion chromatography. Synthesis of lower oligomers was also accomplished by stepwise and block synthetic methods, and then the oligosaccharide products were persulfated. The antiviral, anti-inflammatory and cell growth inhibitory activity of the fully sulfated malto-oligosaccharide sulfonic acids were determined by in vitro tests. Four tested di- and trisaccharide sulfonic acids effectively inhibited the activation of the TNF-α-mediated inflammatory pathway without showing cytotoxicity.
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Affiliation(s)
- Mihály Herczeg
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary;
| | - Fruzsina Demeter
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary;
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, Institute of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (S.K.)
| | - Ágnes Rusznyák
- Department of Molecular and Nanopharmaceutics, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (Á.R.); (F.F.)
- Institute of Healthcare Industry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Jan Hodek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16000 Prague, Czech Republic; (J.H.); (J.W.)
| | - Éva Sipos
- Department of Pharmacodynamics, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (É.S.); (I.L.)
| | - István Lekli
- Department of Pharmacodynamics, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (É.S.); (I.L.)
| | - Ferenc Fenyvesi
- Department of Molecular and Nanopharmaceutics, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (Á.R.); (F.F.)
| | - Jan Weber
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16000 Prague, Czech Republic; (J.H.); (J.W.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, Institute of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (S.K.)
| | - Anikó Borbás
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary;
- HUN-REN-UD Molecular Recognition and Interaction Research Group, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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Papp B, Le Borgne M, Perret F, Marminon C, Józsa L, Pető Á, Kósa D, Nagy L, Kéki S, Ujhelyi Z, Pallér Á, Budai I, Bácskay I, Fehér P. Formulation and Investigation of CK2 Inhibitor-Loaded Alginate Microbeads with Different Excipients. Pharmaceutics 2023; 15:2701. [PMID: 38140042 PMCID: PMC10748227 DOI: 10.3390/pharmaceutics15122701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/22/2023] [Accepted: 11/27/2023] [Indexed: 12/24/2023] Open
Abstract
The aim of this study was to formulate and characterize CK2 inhibitor-loaded alginate microbeads via the polymerization method. Different excipients were used in the formulation to improve the penetration of an active agent and to stabilize our preparations. Transcutol® HP was added to the drug-sodium alginate mixture and polyvinylpyrrolidone (PVP) was added to the hardening solution, alone and in combination. To characterize the formulations, mean particle size, scanning electron microscopy analysis, encapsulation efficiency, swelling behavior, an enzymatic stability test and an in vitro dissolution study were performed. The cell viability assay and permeability test were also carried out on the Caco-2 cell line. The anti-oxidant and anti-inflammatory effects of the formulations were finally evaluated. The combination of Transcutol® HP and PVP in the formulation of sodium alginate microbeads could improve the stability, in vitro permeability, anti-oxidant and anti-inflammatory effects of the CK2 inhibitor.
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Affiliation(s)
- Boglárka Papp
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Institute of Healthcare Industry, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
| | - Marc Le Borgne
- Small Molecules for Biological Targets Team, Centre de Recherche en Cancérologie de Lyon, Centre Léon Bérard, CNRS 5286, INSERM 1052, Université Claude Bernard Lyon 1, Univ Lyon, 69373 Lyon, France; (M.L.B.); (C.M.)
| | - Florent Perret
- Univ Lyon, Université Lyon 1, CNRS, INSA, CPE, ICBMS, 69622 Lyon, France;
| | - Christelle Marminon
- Small Molecules for Biological Targets Team, Centre de Recherche en Cancérologie de Lyon, Centre Léon Bérard, CNRS 5286, INSERM 1052, Université Claude Bernard Lyon 1, Univ Lyon, 69373 Lyon, France; (M.L.B.); (C.M.)
| | - Liza Józsa
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Institute of Healthcare Industry, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
| | - Ágota Pető
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Institute of Healthcare Industry, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
| | - Dóra Kósa
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Institute of Healthcare Industry, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, Institute of Chemistry, University of Debrecen, Egyetem Tér 1, H-4032 Debrecen, Hungary; (L.N.); (S.K.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, Institute of Chemistry, University of Debrecen, Egyetem Tér 1, H-4032 Debrecen, Hungary; (L.N.); (S.K.)
| | - Zoltán Ujhelyi
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Doctoral School of Pharmaceutical Sciences, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
| | - Ádám Pallér
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
| | - István Budai
- Faculty of Engineering, University of Debrecen, Ótemető Utca 2–4, H-4028 Debrecen, Hungary;
| | - Ildikó Bácskay
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Institute of Healthcare Industry, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
- Doctoral School of Pharmaceutical Sciences, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
| | - Pálma Fehér
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary; (B.P.); (L.J.); (Á.P.); (D.K.); (Z.U.); (Á.P.); (I.B.)
- Doctoral School of Pharmaceutical Sciences, University of Debrecen, Nagyerdei Körút 98, H-4032 Debrecen, Hungary
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Pardi-Tóth V, Kuki Á, Kordován MÁ, Róth G, Nagy L, Zsuga M, Nagy T, Kéki S. Molecular data storage using direct analysis in real time (DART) ionization mass spectrometry for decoding. Sci Rep 2023; 13:16576. [PMID: 37789061 PMCID: PMC10547761 DOI: 10.1038/s41598-023-43658-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 09/26/2023] [Indexed: 10/05/2023] Open
Abstract
Molecular data storage is becoming a viable alternative to traditional information storage systems. Here, we propose a method where the presence or absence of a given molecule in a mixture of compounds represents a bit of information. As a novel approach, direct analysis in real time (DART) ionization mass spectrometry is used to recover and decode the information stored at the molecular level. Nicotinic acid derivatives were synthesized and used as the 'bit compounds'. Their volatility and ease of ionization make these molecules especially suitable for DART-MS detection. The application of DART-MS as a method with an ambient ionization technique, enables the re-reading of digital chemical codes embedded in the material of ordinary objects. Our method is designed to store and read back short pieces of digital information, up to several hundred bits. These codes can have the function of barcodes or QR codes, as shown in our proof-of-principle applications. First, modelling a QR code as a link to our university's website, three solutions were prepared, each representing 22 bits. Proceeding further, the bit compounds were incorporated into a polymer matrix that is suitable for 3D printing, and a toy ship was created with a hidden barcode. In addition, decoding software was developed to process the DART-MS spectra. The nicotinic acid components representing the bits dominated the DART-MS spectra and error-free decoding was achieved.
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Grants
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- TKP2021-NKTA-34 National Research, Development and Innovation Fund of Hungary
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- FK-132385 National Research, Development and Innovation Office
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- GINOP-2.3.3-15-2016-00021 European Union and the European Regional Development Fund
- BO/00212/20/7 Hungarian Academy of Sciences
- ÚNKP-22-05-DE-426 National Research, Development and Innovation Fund
- University of Debrecen
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Affiliation(s)
- Veronika Pardi-Tóth
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
| | - Marcell Árpád Kordován
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
| | - Gergő Róth
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary.
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary
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Czifrák K, Lakatos C, Szabó G, Vadkerti B, Daróczi L, Zsuga M, Kéki S. Bisphenol A Diglycidyl Ether-Primary Amine Cooligomer-poly(ε-caprolactone) Networks: Synthesis and Characterization. Polymers (Basel) 2023; 15:2937. [PMID: 37447582 DOI: 10.3390/polym15132937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 06/30/2023] [Accepted: 07/02/2023] [Indexed: 07/15/2023] Open
Abstract
In this work, the preparation and systematic investigation of cross-linked polyurethane-epoxy (PU-EP) polymer systems are reported. The PU-EP polymers were prepared using a reaction of isocyanate (NCO)-terminated PU-prepolymer with diglycidyl ether of bisphenol A (DGEBA)-amine cooligomer. The oligomerization of DGEBA was carried out by adding furfurylamine (FA) or ethanolamine (EA), resulting in DGEBA-amine cooligomers. For the synthesis of NCO-terminated PU-prepolymer, poly(ε-caprolactone)diol (PCD) (Mn = 2 kg/mol) and 1,6-hexamethylene diisocyanate (HDI) were used. The cross-linking was achieved by adding DGEBA-amine cooligomer to PU-prepolymer, in which the obtained urethane bonds, due to the presence of free hydroxil groups in the activated DGEBA, served as netpoints. During cross-linking, ethanolamine provides an additional free hydroxyl group for the formation of a new urethane bond, while furfurylamine can serve as a thermoreversible coupling element (e.g., Diels-Alder adduct). The PU-EP networks were characterized using attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), dynamical mechanical analysis (DMA) and scanning electron microscopy (SEM). The DMA curves of some PU-EPs (depending on the compositions and the synthetic method) revealed a plateau-like region above the melting temperature (Tm) of PCD, confirming the presence of a cross-linked structure. This property resulted in a shape memory (SM) behavior for these samples, which can be fine-tuned in the presence of furfurylamine through the formation of additional thermoreversible bonds (e.g., Diels-Alder adduct).
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Affiliation(s)
- Katalin Czifrák
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Csilla Lakatos
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Gabriella Szabó
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Bence Vadkerti
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Lajos Daróczi
- Department of Solid State Physics, University of Debrecen, Bem tér 18/b, H-4026 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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Nagy T, Róth G, Benedek M, Kuki Á, Timári I, Zsuga M, Kéki S. Enhanced Copolymer Characterization for Polyethers Using Gel Permeation Chromatography Combined with Artificial Neural Networks. Anal Chem 2023. [PMID: 37344969 DOI: 10.1021/acs.analchem.2c02913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/23/2023]
Abstract
Gel permeation chromatography (GPC) is a generally applied method for the mass analysis of various polymers and copolymers, but it inherently fails to provide additional important information such as the composition of copolymers. However, we will show that GPC measurements using different solvents can yield not just the correct molecular weight but the composition of the copolymer. Accordingly, artificial neural networks (ANNs) have been developed to process the data of GPC measurements and determine the molecular weight and the chemical composition of the copolymers. The target values of the ANNs were obtained by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and nuclear magnetic resonance (NMR) spectroscopy. Our GPC-ANN method is demonstrated by the analysis of various poloxamers, i.e., poly(ethylene oxide) (PEO)-poly(propylene oxide) (PPO) block copolymers. Two ANNs were constructed. The first one (ANN_1) works in a wider mass range (from 900 to 12,500 dalton), while the second one (ANN_2) produces more output values. ANN_2 can thus predict seven characteristic copolymer parameters, namely, two average molecular weights, the average weight fraction of the EO unit, and four average numbers of the repeat units. The correlation between the experimentally obtained outputs and the predicted ones is high (r > 0.98). The accuracy of the ANNs is very convincing, and both ANNs predict the number-average molecular weight (Mn) with an accuracy below 5%. Furthermore, this work is the first step for creating an open database and applications extending the use of the GPC-ANN method for the analysis of copolymers.
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Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Gergő Róth
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Máté Benedek
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - István Timári
- Department of Organic Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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Szabó L, Deák G, Nyul D, Kéki S. Flexible Investment Casting Wax Patterns for 3D-Printing: Their Rheological and Mechanical Characterizations. Polymers (Basel) 2022; 14:4744. [PMID: 36365739 PMCID: PMC9657807 DOI: 10.3390/polym14214744] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/31/2022] [Accepted: 11/03/2022] [Indexed: 04/12/2024] Open
Abstract
The mechanical and rheological characterizations of flexible investment casting patterns capable of 3D printing are reported. The wax pattern was composed of microcrystalline hydrocarbon wax (DMW7478), Piccotex 75 (a copolymer of α-methyl-styrene and vinyl toluene with a 75/25 molar ratio, respectively) and Escorene (a copolymer of ethylene and vinyl acetate with a 72/28 mass ratio, respectively). It was found that in order to obtain a wax pattern with appreciable mechanical properties, the content of the microcrystalline hydrocarbon wax in these blends should not exceed 30% (m/m). Thus, a series of patterns with 28% (m/m) wax and varying Piccotex and Escorene contents spanning from 0 to 72% (m/m) was prepared. The dependence of the dynamic viscosities of the wax patterns on the composition was described using a stretched exponential model, whereas their variations with the temperature were interpreted in terms of the Arrhenius-Guzman equation. Furthermore, the slopes of the lines fitted to the viscosity versus temperature curves at the pour point decreased linearly with the Piccotex content. Non-Newtonian changes in the shear stress with the shear rate and shear stress crystallization were observed at temperatures near the pour points. The mechanical properties were evaluated using the uniaxial tensile mode and by three-point bending experiments. It was found that the stress (σ) versus the relative elongation (ε) curves can effectively be rendered by means of the standard linear solid (SLS) viscoelastic model. In addition, it was also established that the Young's modulus varied according to a sigmoid-type curve with the piccotex content, while the yield stress decreased linearly with the concentration of Piccotex. In addition, based on the spooling suitability and printability, the patterns were rated and it was found that the most appropriate wax pattern compositions for 3D printing were those which contained 30% (m/m) and 35% (m/m) Piccotex.
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Affiliation(s)
- László Szabó
- Bogdány Petrol Ltd., Gyártelep, H-4511 Nyírbogdány, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - György Deák
- Department of Applied Chemistry, Faculty of Sciences and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Dávid Nyul
- Department of Physical Chemistry, Faculty of Sciences and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Sciences and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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7
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Papp F, Toombes GES, Pethő Z, Bagosi A, Feher A, Almássy J, Borrego J, Kuki Á, Kéki S, Panyi G, Varga Z. Multiple mechanisms contribute to fluorometry signals from the voltage-gated proton channel. Commun Biol 2022; 5:1131. [PMID: 36289443 PMCID: PMC9606259 DOI: 10.1038/s42003-022-04065-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 09/30/2022] [Indexed: 11/30/2022] Open
Abstract
Voltage-clamp fluorometry (VCF) supplies information about the conformational changes of voltage-gated proteins. Changes in the fluorescence intensity of the dye attached to a part of the protein that undergoes a conformational rearrangement upon the alteration of the membrane potential by electrodes constitute the signal. The VCF signal is generated by quenching and dequenching of the fluorescence as the dye traverses various local environments. Here we studied the VCF signal generation, using the Hv1 voltage-gated proton channel as a tool, which shares a similar voltage-sensor structure with voltage-gated ion channels but lacks an ion-conducting pore. Using mutagenesis and lipids added to the extracellular solution we found that the signal is generated by the combined effects of lipids during movement of the dye relative to the plane of the membrane and by quenching amino acids. Our 3-state model recapitulates the VCF signals of the various mutants and is compatible with the accepted model of two major voltage-sensor movements. Fluorometry signals indicating conformational change in an ion channel are generated by quenching amino acids and lipid effects during movement of the dye relative to the plane of the membrane.
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Affiliation(s)
- Ferenc Papp
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Gilman E. S. Toombes
- grid.94365.3d0000 0001 2297 5165Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 35 Convent Dr., MSC 3701, Bethesda, MD 20892-3701 USA
| | - Zoltán Pethő
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary ,grid.5949.10000 0001 2172 9288Institut für Physiologie II, Robert-Koch-Str. 27b, 48149 Münster, Germany
| | - Adrienn Bagosi
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Adam Feher
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - János Almássy
- grid.7122.60000 0001 1088 8582Department of Physiology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Jesús Borrego
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Ákos Kuki
- grid.7122.60000 0001 1088 8582Department of Applied Chemistry, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Sándor Kéki
- grid.7122.60000 0001 1088 8582Department of Applied Chemistry, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Gyorgy Panyi
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
| | - Zoltan Varga
- grid.7122.60000 0001 1088 8582Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Egyetem ter 1, Debrecen, H-4032 Hungary
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8
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Bereczki I, Vimberg V, Lőrincz E, Papp H, Nagy L, Kéki S, Batta G, Mitrović A, Kos J, Zsigmond Á, Hajdú I, Lőrincz Z, Bajusz D, Petri L, Hodek J, Jakab F, Keserű GM, Weber J, Naesens L, Herczegh P, Borbás A. Semisynthetic teicoplanin derivatives with dual antimicrobial activity against SARS-CoV-2 and multiresistant bacteria. Sci Rep 2022; 12:16001. [PMID: 36163239 PMCID: PMC9511441 DOI: 10.1038/s41598-022-20182-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/08/2022] [Indexed: 11/09/2022] Open
Abstract
Patients infected with SARS-CoV-2 risk co-infection with Gram-positive bacteria, which severely affects their prognosis. Antimicrobial drugs with dual antiviral and antibacterial activity would be very useful in this setting. Although glycopeptide antibiotics are well-known as strong antibacterial drugs, some of them are also active against RNA viruses like SARS-CoV-2. It has been shown that the antiviral and antibacterial efficacy can be enhanced by synthetic modifications. We here report the synthesis and biological evaluation of seven derivatives of teicoplanin bearing hydrophobic or superbasic side chain. All but one teicoplanin derivatives were effective in inhibiting SARS-CoV-2 replication in VeroE6 cells. One lipophilic and three perfluoroalkyl conjugates showed activity against SARS-CoV-2 in human Calu-3 cells and against HCoV-229E, an endemic human coronavirus, in HEL cells. Pseudovirus entry and enzyme inhibition assays established that the teicoplanin derivatives efficiently prevent the cathepsin-mediated endosomal entry of SARS-CoV-2, with some compounds inhibiting also the TMPRSS2-mediated surface entry route. The teicoplanin derivatives showed good to excellent activity against Gram-positive bacteria resistant to all approved glycopeptide antibiotics, due to their ability to dually bind to the bacterial membrane and cell-wall. To conclude, we identified three perfluoralkyl and one monoguanidine analog of teicoplanin as dual inhibitors of Gram-positive bacteria and SARS-CoV-2.
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Affiliation(s)
- Ilona Bereczki
- Department of Pharmaceutical Chemistry, University of Debrecen, Debrecen, Egyetem tér 1, 4032, Hungary.,National Laboratory of Virology, University of Pécs, Pecs, Ifjúság útja 20, 7624, Hungary
| | - Vladimir Vimberg
- Laboratory for Biology of Secondary Metabolism, Institute of Microbiology, Academy of Sciences of the Czech Republic, BIOCEV, Průmyslová 595, 252 50, Vestec, Czech Republic
| | - Eszter Lőrincz
- Department of Pharmaceutical Chemistry, University of Debrecen, Debrecen, Egyetem tér 1, 4032, Hungary.,Institute of Healthcare Industry, University of Debrecen, Debrecen, Nagyerdei körút 98, 4032, Hungary.,Doctoral School of Pharmaceutical Sciences, University of Debrecen, Debrecen, Egyetem tér 1, 4032, Hungary
| | - Henrietta Papp
- National Laboratory of Virology, University of Pécs, Pecs, Ifjúság útja 20, 7624, Hungary.,Faculty of Sciences, Institute of Biology, University of Pécs, Pecs, Ifjúság útja 6, 7624, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, University of Debrecen, Debrecen, 4032, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Debrecen, 4032, Hungary
| | - Gyula Batta
- Department of Organic Chemistry, University of Debrecen, Debrecen, 4032, Hungary
| | - Ana Mitrović
- Department of Biotechnology, Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
| | - Janko Kos
- Department of Biotechnology, Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia.,Faculty of Pharmacy, University of Ljubljana, Aškerčeva cesta 7, 1000, Ljubljana, Slovenia
| | - Áron Zsigmond
- TargetEx Ltd., Dunakeszi, Madách Imre utca 31/2, 2120, Hungary
| | - István Hajdú
- TargetEx Ltd., Dunakeszi, Madách Imre utca 31/2, 2120, Hungary
| | - Zsolt Lőrincz
- TargetEx Ltd., Dunakeszi, Madách Imre utca 31/2, 2120, Hungary
| | - Dávid Bajusz
- Medicinal Chemistry Research Group, Research Centre for Natural Sciences, Budapest, Magyar tudósok krt. 2, 1117, Hungary
| | - László Petri
- Medicinal Chemistry Research Group, Research Centre for Natural Sciences, Budapest, Magyar tudósok krt. 2, 1117, Hungary
| | - Jan Hodek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, 16000, Prague 6, Czech Republic
| | - Ferenc Jakab
- National Laboratory of Virology, University of Pécs, Pecs, Ifjúság útja 20, 7624, Hungary.,Faculty of Sciences, Institute of Biology, University of Pécs, Pecs, Ifjúság útja 6, 7624, Hungary
| | - György M Keserű
- Medicinal Chemistry Research Group, Research Centre for Natural Sciences, Budapest, Magyar tudósok krt. 2, 1117, Hungary.
| | - Jan Weber
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, 16000, Prague 6, Czech Republic
| | - Lieve Naesens
- Rega Institute for Medical Research, KU Leuven, 3000, Leuven, Belgium.
| | - Pál Herczegh
- Department of Pharmaceutical Chemistry, University of Debrecen, Debrecen, Egyetem tér 1, 4032, Hungary
| | - Anikó Borbás
- Department of Pharmaceutical Chemistry, University of Debrecen, Debrecen, Egyetem tér 1, 4032, Hungary. .,National Laboratory of Virology, University of Pécs, Pecs, Ifjúság útja 20, 7624, Hungary.
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9
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Kordován MÁ, Hegedűs C, Czifrák K, Lakatos C, Kálmán-Szabó I, Daróczi L, Zsuga M, Kéki S. Novel Polyurethane Scaffolds Containing Sucrose Crosslinker for Dental Application. Int J Mol Sci 2022; 23:ijms23147904. [PMID: 35887250 PMCID: PMC9319899 DOI: 10.3390/ijms23147904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/14/2022] [Accepted: 07/16/2022] [Indexed: 02/05/2023] Open
Abstract
In this paper, the synthesis, characterization, and properties of crosslinked poly(ε-caprolactone)-based polyurethanes as potential tissue replacement materials are reported. The polyurethane prepolymers were prepared from poly(ε-caprolactone)diol (PCD), polyethylene glycol (PEG)/polylactic acid diol (PLAD), and 1,6-hexamethylene diisocyanate (HDI). In these segmented polyurethanes, the role of PEG/PLAD was to tune the hydrophobic/hydrophilic character of the resulting polymer while sucrose served as a crosslinking agent. PLAD was synthesized by the polycondensation reaction of D,L-lactic acid and investigated by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and nuclear magnetic resonance spectroscopy (NMR). The crosslinked polyurethane samples (SUPURs) obtained were characterized by attenuated total reflectance Fourier-transform infrared spectroscopy (AT-FT-IR), swelling, and mechanical (uniaxial tensile tests) experiments. The thermo and thermomechanical behavior were studied by differential scanning calorimetry (DSC) and dynamical mechanical analysis (DMA). The viability of dental pulp stem cells was investigated in the case of polyurethanes composed of fully biocompatible elements. In our studies, none of our polymers showed toxicity to stem cells (DPSCs).
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Affiliation(s)
- Marcell Árpád Kordován
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (M.Á.K.); (K.C.); (C.L.); (M.Z.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Csaba Hegedűs
- Department of Prosthetic Dentistry and Biomaterials, Faculty of Dentistry, University of Debrecen, H-4012 Debrecen, Hungary; (C.H.); (I.K.-S.)
| | - Katalin Czifrák
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (M.Á.K.); (K.C.); (C.L.); (M.Z.)
| | - Csilla Lakatos
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (M.Á.K.); (K.C.); (C.L.); (M.Z.)
| | - Ibolya Kálmán-Szabó
- Department of Prosthetic Dentistry and Biomaterials, Faculty of Dentistry, University of Debrecen, H-4012 Debrecen, Hungary; (C.H.); (I.K.-S.)
| | - Lajos Daróczi
- Department of Solid State Physics, University of Debrecen, Bem tér 18/b, H-4026 Debrecen, Hungary;
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (M.Á.K.); (K.C.); (C.L.); (M.Z.)
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (M.Á.K.); (K.C.); (C.L.); (M.Z.)
- Correspondence: ; Tel.: +36-52-512-900 (ext. 22455)
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10
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Nagyházi M, Lukács Á, Turczel G, Hancsók J, Valyon J, Bényei A, Kéki S, Tuba R. Catalytic Decomposition of Long-Chain Olefins to Propylene via Isomerization-Metathesis Using Latent Bicyclic (Alkyl)(Amino)Carbene-Ruthenium Olefin Metathesis Catalysts. Angew Chem Int Ed Engl 2022; 61:e202204413. [PMID: 35420225 PMCID: PMC9400880 DOI: 10.1002/anie.202204413] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Indexed: 02/02/2023]
Abstract
One of the most exciting scientific challenges today is the catalytic degradation of non-biodegradable polymers into value-added chemical feedstocks. The mild pyrolysis of polyolefins, including high-density polyethylene (HDPE), results in pyrolysis oils containing long-chain olefins as major products. In this paper, novel bicyclic (alkyl)(amino)carbene ruthenium (BICAAC-Ru) temperature-activated latent olefin metathesis catalysts, which can be used for catalytic decomposition of long-chain olefins to propylene are reported. These thermally stable catalysts show significantly higher selectivity to propylene at a reaction temperature of 75 °C compared to second generation Hoveyda-Grubbs or CAAC-Ru catalysts under ethenolysis conditions. The conversion of long-chain olefins (e.g., 1-octadecene or methyl oleate) to propylene via isomerization-metathesis is performed by using a (RuHCl)(CO)(PPh3 )3 isomerization co-catalyst. The reactions can be carried out at a BICAAC-Ru catalyst loading as low as 1 ppm at elevated reaction temperature (75 °C). The observed turnover number and turnover frequency are as high as 55 000 and 10 000 molpropylene molcatalyst -1 h-1 , respectively.
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Affiliation(s)
- Márton Nagyházi
- Institute of Materials and Environmental Chemistry, Eötvös Loránd Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1519, Budapest, Hungary.,Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, 1111, Budapest, Hungary
| | - Ádám Lukács
- Institute of Materials and Environmental Chemistry, Eötvös Loránd Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1519, Budapest, Hungary.,Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, 1111, Budapest, Hungary
| | - Gábor Turczel
- Institute of Materials and Environmental Chemistry, Eötvös Loránd Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1519, Budapest, Hungary
| | - Jenő Hancsók
- Research Centre for Biochemical, Environmental and Chemical Engineering, Department of MOL Hydrocarbon and Coal Processing, University of Pannonia, Egyetem u. 10, 8210, Veszprém, Hungary
| | - József Valyon
- Institute of Materials and Environmental Chemistry, Eötvös Loránd Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1519, Budapest, Hungary
| | - Attila Bényei
- Department of Pharmaceutical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, 4032, Debrecen, Hungary
| | - Róbert Tuba
- Institute of Materials and Environmental Chemistry, Eötvös Loránd Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1519, Budapest, Hungary
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11
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Kuki Á, Hashimov M, Nagy T, Tóth C, Zsuga M, Kéki S. Quantification of Polyethylene Glycol 400 Excreted in the Urine by MALDI-TOF Mass Spectrometry. Pharmaceutics 2022; 14:pharmaceutics14071341. [PMID: 35890237 PMCID: PMC9322888 DOI: 10.3390/pharmaceutics14071341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 04/27/2022] [Accepted: 04/29/2022] [Indexed: 11/16/2022] Open
Abstract
Polyethylene glycol 400 (PEG 400) was used as a permeability probe to examine the gastrointestinal tract which can be involved in the pathogenesis of some inflammatory and autoimmune diseases. A novel methodology was developed and validated for the quantitation of PEG 400 excreted in human urine after oral administration using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). The excretion ratios were determined for the most intense ions corresponding to nine PEG 400 oligomers. The relative error of accuracy was between –6.0% and 8.5%, and the relative standard deviation (RSD) of the precision was below 15%. Our method was successfully applied in a large-scale experimental study involving nearly two hundred volunteers. Due to the large number of measurements, detailed and reliable statistical analysis was performed. No significant difference was found between the male and female group of volunteers at 0.05 significance level, except the two largest PEG oligomers. However, the average excretion ratios of the male volunteers are greater than that of the women for all the nine PEG oligomers, suggesting a difference in the intestinal permeability between men and women.
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Affiliation(s)
- Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (Á.K.); (M.H.); (T.N.); (M.Z.)
| | - Mahir Hashimov
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (Á.K.); (M.H.); (T.N.); (M.Z.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (Á.K.); (M.H.); (T.N.); (M.Z.)
| | - Csaba Tóth
- Today’s Life Science and Research Kft., Bulcsú utca 20/A, H-2120 Dunakeszi, Hungary;
| | - Miklos Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (Á.K.); (M.H.); (T.N.); (M.Z.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (Á.K.); (M.H.); (T.N.); (M.Z.)
- Correspondence: ; Fax: +36-52-518662
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12
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Nagyházi M, Lukács Á, Turczel G, Hancsók J, Valyon J, Bényei A, Kéki S, Tuba R. Catalytic Decomposition of Long‐Chain Olefins to Propylene via Isomerization‐Metathesis Using Latent Bicyclic (Alkyl)(Amino)Carbene‐Ruthenium Olefin Metathesis Catalysts. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Márton Nagyházi
- Research Centre for Natural Sciences: Termeszettudomanyi Kutatokozpont Institute of Material and Environmental Chemistry HUNGARY
| | - Ádám Lukács
- Research Centre for Natural Sciences: Termeszettudomanyi Kutatokozpont Institute of Material and Environmental Chemistry HUNGARY
| | - Gábor Turczel
- Research Centre for Natural Sciences: Termeszettudomanyi Kutatokozpont Institute of Materials and Environmental Chemistry Magyar Tudósok körútja 2 1117 Budapest HUNGARY
| | - Jenő Hancsók
- University of Pannonia: Pannon Egyetem Biochemical, Environmental and Chemical Engineering HUNGARY
| | - József Valyon
- Research Centre for Natural Sciences: Termeszettudomanyi Kutatokozpont Institute of Material and Environmental Chemistry HUNGARY
| | - Attila Bényei
- University of Debrecen: Debreceni Egyetem Department of Pharmaceutical Chemistry HUNGARY
| | - Sándor Kéki
- University of Debrecen: Debreceni Egyetem Department of Applied Chemistry HUNGARY
| | - Robert Tuba
- Research Centre for Natural Sciences of the Hungarian Academy of Sciences Institute of Materials and Environmental Chemistry Magyar tudosok korutja 2. 1117 Budapest HUNGARY
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13
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Lakatos C, Kordován MÁ, Czifrák K, Nagy L, Vadkerti B, Daróczi L, Zsuga M, Kéki S. Synthesis of Sucrose-HDI Cooligomers: New Polyols for Novel Polyurethane Networks. Int J Mol Sci 2022; 23:ijms23031444. [PMID: 35163372 PMCID: PMC8836168 DOI: 10.3390/ijms23031444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 02/04/2023] Open
Abstract
Sucrose-1,6-hexamethylene diisocyanate (HDI) cooligomers were synthesized and used as new polyols for poly(ε-caprolactone) (PCL)-based polyurethanes. The polyaddition reaction of sucrose and HDI was monitored by MALDI-TOF MS. It was found that by selecting appropriate reaction conditions, mostly linear oligomer chains containing 16 sucrose units could be obtained. For the synthesis of polyurethane networks, prepolymers were prepared by the reaction of poly(ε-caprolactone) (PCL, 10 kg/mol) with HDI or 4,4′-methylene diphenyl diisocyanate (MDI) and were reacted with sucrose-HDI cooligomers. The so-obtained sucrose-containing polyurethanes were characterized by means of attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FT IR), swelling, mechanical (uniaxial tensile tests) and differential scanning calorimetry (DSC).
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Affiliation(s)
- Csilla Lakatos
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
| | - Marcell Árpád Kordován
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Katalin Czifrák
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
| | - Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
| | - Bence Vadkerti
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Lajos Daróczi
- Department of Solid State Physics, Faculty of Science and Technology, University of Debrecen, Bem tér 18/b, H-4026 Debrecen, Hungary;
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (C.L.); (M.Á.K.); (K.C.); (L.N.); (B.V.); (M.Z.)
- Correspondence: ; Tel.: +36-52-512-900 (ext. 22455)
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14
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Vadkerti B, Juhász A, Lakatos C, Zsuga M, Kéki S, Nagy L. Reactivity of multi-arm polyols towards isocyanates. NEW J CHEM 2022. [DOI: 10.1039/d2nj01103d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this research, the kinetics of the reaction of various polymer polyol crosslinking agents with phenyl isocyanate is reported.
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Affiliation(s)
- Bence Vadkerti
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Anett Juhász
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- BorsodChem Zrt., Bólyai tér 1, H-3700 Kazincbarcika, Hungary
| | - Csilla Lakatos
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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15
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Balla A, Nagyhazi M, Turczel G, Solt HE, Mihályi MR, Hancsók J, Valyon J, Nagy T, Kéki S, Anastas P, Tuba R. Hydrolytic Dehydrogenation of Ammonia Borane in Neat Water Using Recyclable Zeolite-Supported Cyclic Alkyl Amino Carbene (CAAC)-Ru Catalysts. NEW J CHEM 2022. [DOI: 10.1039/d2nj03334h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclic alkyl amino mono- and biscarbene ruthenium (CAAC-Ru) complexes were immobilized on mesoporous Y zeolite (catalysts 3 and 4) and showed high activity and stability in ammonia borane (AB) hydrolytic...
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16
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Patzkó Á, Deli G, Cseh T, Beleznay Z, Nagy L, Kéki S, Mike A, Pál E, Komoly S, Illes Z, Csongor A, Pfund Z. Investigation of oxidative stress in patients with multifocal motor neuropathy. Ideggyógyászati szemle 2022; 75:385-393. [DOI: 10.18071/isz.75.0385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Multifocal motor neuropathy (MMN) is a rare, immune-mediated illness attacking exclusively motor nerves. It is known that oxidative stress is present in peripheral neuropathies, but it has not been investigated MMN. We measured in our prospective study the L-arginine, symmetric and asymmetric dimethylarginine (SDMA, ADMA) serum concentrations of 10 patients and 10 controls before and after intravenous immunoglobulin treatment (IVIG), as markers of the L-arginine/NO pathway involved in chronic inflammation and oxidative stress. The functions of motor nerves were tested in all patients and the serum antiganglioside antibody levels were detected, as well. MMN patients showed significantly higher ADMA (p = 0.0048; 0.98 and 0.63, respectively) and SDMA levels (p = 0.001; 0.88 and 0.51, respectively) than healthy controls, while L-arginine was not different. Controlling for the covariant age, ADMA (B = -0.474; p = 0.041) or SDMA (B = -0.896; p < 0.0005) serum levels proved to be the significant predictors of the presence of MMN. IVIG therapy decreased significantly ADMA concentrations (p = 0.025; 0.98 and 0.84, respectively) and showed a trend to reduce SDMA levels (p = 0.1; 0.88 and 0.74, respectively). The dimethylamine levels did not correlate with the number of affected nerves, disease duration, or the presence of ganglioside antibodies. The conduction block-related peripheral motor dysfunction improved right after the IVIG treatment. Dimethylamine levels are elevated in the serum and are responsive to IVIG therapy in MMN. These findings support the presence of oxidative stress in MMN.
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Róth G, Nagy T, Kuki Á, Hashimov M, Vonza Z, Timári I, Zsuga M, Kéki S. Polydispersity Ratio and Its Application for the Characterization of Poloxamers. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01552] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gergő Róth
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Mahir Hashimov
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Zsófia Vonza
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - István Timári
- Department of Organic Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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Borbély A, Pethő L, Szabó I, Al-Majidi M, Steckel A, Nagy T, Kéki S, Kalló G, Csősz É, Mező G, Schlosser G. Structural Characterization of Daunomycin-Peptide Conjugates by Various Tandem Mass Spectrometric Techniques. Int J Mol Sci 2021; 22:ijms22041648. [PMID: 33562082 PMCID: PMC7914584 DOI: 10.3390/ijms22041648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 02/01/2021] [Accepted: 02/03/2021] [Indexed: 11/16/2022] Open
Abstract
The use of peptide-drug conjugates has generated wide interest as targeted antitumor therapeutics. The anthracycline antibiotic, daunomycin, is a widely used anticancer agent and it is often conjugated to different tumor homing peptides. However, comprehensive analytical characterization of these conjugates via tandem mass spectrometry (MS/MS) is challenging due to the lability of the O-glycosidic bond and the appearance of MS/MS fragment ions with little structural information. Therefore, we aimed to investigate the optimal fragmentation conditions that suppress the prevalent dissociation of the anthracycline drug and provide good sequence coverage. In this study, we comprehensively compared the performance of common fragmentation techniques, such as higher energy collisional dissociation (HCD), electron transfer dissociation (ETD), electron-transfer higher energy collisional dissociation (EThcD) and matrix-assisted laser desorption/ionization–tandem time-of-flight (MALDI-TOF/TOF) activation methods for the structural identification of synthetic daunomycin-peptide conjugates by high-resolution tandem mass spectrometry. Our results showed that peptide backbone fragmentation was inhibited by applying electron-based dissociation methods to conjugates, most possibly due to the “electron predator” effect of the daunomycin. We found that efficient HCD fragmentation was largely influenced by several factors, such as amino acid sequences, charge states and HCD energy. High energy HCD and MALDI-TOF/TOF combined with collision induced dissociation (CID) mode are the methods of choice to unambiguously assign the sequence, localize different conjugation sites and differentiate conjugate isomers.
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Affiliation(s)
- Adina Borbély
- MTA-ELTE Lendület Ion Mobility Mass Spectrometry Research Group and Department of Analytical Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (A.B.); (M.A.-M.); (A.S.)
| | - Lilla Pethő
- Eötvös Loránd Research Network, Supported Research Groups, Research Group of Peptide Chemistry, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (L.P.); (I.S.); (G.M.)
| | - Ildikó Szabó
- Eötvös Loránd Research Network, Supported Research Groups, Research Group of Peptide Chemistry, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (L.P.); (I.S.); (G.M.)
| | - Mohammed Al-Majidi
- MTA-ELTE Lendület Ion Mobility Mass Spectrometry Research Group and Department of Analytical Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (A.B.); (M.A.-M.); (A.S.)
- Hevesy György PhD School of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
| | - Arnold Steckel
- MTA-ELTE Lendület Ion Mobility Mass Spectrometry Research Group and Department of Analytical Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (A.B.); (M.A.-M.); (A.S.)
- Hevesy György PhD School of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (S.K.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (S.K.)
| | - Gergő Kalló
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (G.K.); (É.C.)
| | - Éva Csősz
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (G.K.); (É.C.)
| | - Gábor Mező
- Eötvös Loránd Research Network, Supported Research Groups, Research Group of Peptide Chemistry, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (L.P.); (I.S.); (G.M.)
- Department of Organic Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
| | - Gitta Schlosser
- MTA-ELTE Lendület Ion Mobility Mass Spectrometry Research Group and Department of Analytical Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary; (A.B.); (M.A.-M.); (A.S.)
- Correspondence: ; Tel.: +36-1-372-2500
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Nagy T, Nagy L, Erdélyi Z, Baradács E, Deák G, Zsuga M, Kéki S. Environmentally friendly Zn-air rechargeable battery with heavy metal free charcoal based air cathode. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137592] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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20
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Nagy T, Róth G, Kuki Á, Zsuga M, Kéki S. Mass Spectral Filtering by Mass-Remainder Analysis (MARA) at High Resolution and Its Application to Metabolite Profiling of Flavonoids. Int J Mol Sci 2021; 22:ijms22020864. [PMID: 33467107 PMCID: PMC7830504 DOI: 10.3390/ijms22020864] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 01/13/2021] [Accepted: 01/14/2021] [Indexed: 11/16/2022] Open
Abstract
Flavonoids represent an important class of secondary metabolites because of their potential health benefits and functions in plants. We propose a novel method for the comprehensive flavonoid filtering and screening based on direct infusion mass spectrometry (DIMS) analysis. The recently invented data mining procedure, the multi-step mass-remainder analysis (M-MARA) technique is applied for the effective mass spectral filtering of the peak rich spectra of natural herb extracts. In addition, our flavonoid-filtering algorithm facilitates the determination of the elemental composition. M-MARA flavonoid-filtering uses simple mathematical and logical operations and thus, it can easily be implemented in a regular spreadsheet software. A huge benefit of our method is the high speed and the low demand for computing power and memory that enables the real time application even for tandem mass spectrometric analysis. Our novel method was applied for the electrospray ionization (ESI) DIMS spectra of various herb extract, and the filtered mass spectral data were subjected to chemometrics analysis using principal component analysis (PCA).
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Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (G.R.); (Á.K.); (M.Z.)
| | - Gergő Róth
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (G.R.); (Á.K.); (M.Z.)
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (G.R.); (Á.K.); (M.Z.)
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (G.R.); (Á.K.); (M.Z.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (T.N.); (G.R.); (Á.K.); (M.Z.)
- Correspondence: ; Fax: +36-52-518662
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21
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Farkas V, Turczel G, Deme J, Domján A, Trif L, Mirzaei A, Vu Hai D, Nagyházi M, Kéki S, Huszthy P, Tuba R. Synthesis and characterization of a pH-responsive mesalazine-polynorbornene supramolecular assembly. Polym Chem 2021. [DOI: 10.1039/d1py00194a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A pH-responsive mesalazine (anti-inflammatory drug for Crohn's disease)–crown ether and perfluoro tert-butyl functionalized polynorbornene supramolecular assembly has been prepared for targeted drug delivery.
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Affiliation(s)
- Vajk Farkas
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
| | - Gábor Turczel
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
| | - János Deme
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
| | - Attila Domján
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
- NMR Laboratory
- Research Centre for Natural Sciences
| | - László Trif
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
| | - Anvar Mirzaei
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
| | - Dang Vu Hai
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
| | - Márton Nagyházi
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
| | - Sándor Kéki
- Department of Applied Chemistry
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Péter Huszthy
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- H-1111 Budapest
- Hungary
| | - Róbert Tuba
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungary
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22
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Czifrák K, Lakatos C, Árpád Kordován M, Nagy L, Daróczi L, Zsuga M, Kéki S. Block Copolymers of Poly(ω-Pentadecalactone) in Segmented Polyurethanes: Novel Biodegradable Shape Memory Polyurethanes. Polymers (Basel) 2020; 12:polym12091928. [PMID: 32859018 PMCID: PMC7563291 DOI: 10.3390/polym12091928] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 08/21/2020] [Accepted: 08/22/2020] [Indexed: 11/18/2022] Open
Abstract
In this report, the synthesis of poly(ω-pentadecalactone) (PPDL) (co)polymers and their incorporation into polyurethanes (PUs) are reported. Optimal conditions for the ring-opening polymerization (ROP) of ω-pentadecalactone (PDL) using dibutyltin dilaurate catalyst were established. For the synthesis of linear and crosslinked PUs, 50 kDa poly(ε-caprolactone) (PCL) and 1,6-hexamethylenediisocyanate (HDI) were used. The obtained polyurethanes were characterized by Attenuated Total Reflectance Fourier-Transform Infrared spectroscopy (AT-FTIR), differential scanning calorimetry (DSC), and dynamical mechanical analysis (DMA). The DMA of the selected sample showed a rubbery plateau on the storage modulus versus temperature curve predicting shape memory behavior. Indeed, good shape memory performances were obtained with shape fixity (Rf) and shape recovery (Rr) ratios.
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Affiliation(s)
- Katalin Czifrák
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (K.C.); (C.L.); (M.Á.K.); (L.N.); (M.Z.)
| | - Csilla Lakatos
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (K.C.); (C.L.); (M.Á.K.); (L.N.); (M.Z.)
| | - Marcell Árpád Kordován
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (K.C.); (C.L.); (M.Á.K.); (L.N.); (M.Z.)
| | - Lajos Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (K.C.); (C.L.); (M.Á.K.); (L.N.); (M.Z.)
| | - Lajos Daróczi
- Department of Solid State Physics, University of Debrecen, Bem tér 18/b, H-4026 Debrecen, Hungary;
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (K.C.); (C.L.); (M.Á.K.); (L.N.); (M.Z.)
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (K.C.); (C.L.); (M.Á.K.); (L.N.); (M.Z.)
- Correspondence: ; Tel.: +36-52-512-900 (ext. 22455)
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Adamoczky A, Nagy L, Nagy M, Zsuga M, Kéki S. Conversion of Isocyanide to Amine in The Presence of Water and Hg(II) Ions: Kinetics and Mechanism as Detected by Fluorescence Spectroscopy and Mass Spectrometry. Int J Mol Sci 2020; 21:E5588. [PMID: 32759870 PMCID: PMC7432382 DOI: 10.3390/ijms21155588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 07/27/2020] [Accepted: 07/30/2020] [Indexed: 11/16/2022] Open
Abstract
Aromatic isocyanides including isocyanonaphthalene derivatives have been proven to be very effective fluorescent sensors for the quantification of Hg(II) ions in water. Thus, the reaction of 1,5-isocyanoaminonaphthalene (1,5-ICAN), which is one of the most important members of this family, with water and HgCl2 as the oxidation agents, was studied by fluorescence spectroscopy and mass spectrometry in order to get deeper insight into the kinetics and mechanistic details of this complex reaction. The reactions of 1,5-ICAN with water and HgCl2 were performed in various water/co-solvent mixtures of different compositions. The co-solvents used in this study were both aprotic solvents including tetrahydrofuran, acetonitrile and N,N-dimethylformamide and protic solvents, such as ethanol and 2-propanol. It was found that in aprotic solvents the conversion of the isocyano group to amino moiety takes place, while in protic solvents the corresponding carbamate (urethane) group is formed in addition to the amino moiety. The variation of the resulting fluorescence intensities versus time curves were described using an irreversible, consecutive reaction model, in which the formation of isocyanate and carbamic acid intermediates, as well as diamino and carbamate (in the case of protic solvents) products were assumed. The formation of these intermediates and products was unambiguously confirmed by mass spectrometric measurements. Furthermore, by fitting the model to the experimental fluorescence versus time curves, the corresponding rate coefficients were determined. It was observed that the overall rate of transformation of the isocyano group to amino moiety increased with the water concentration and the polarity of the co-solvent. It was also supported that formation of diamino and carbamate derivatives in protic solvents takes place simultaneously and that the ratio of the amino to the carbamate function increased with the increasing water concentration. In addition, with an extension, the model presented herein proved to be capable of describing the kinetics of the transformation of 1,5-diisocyanonaphthalene (1,5-DIN) into 1,5-diaminonaphthalene (1,5-DAN) in the mixtures of water/aprotic solvents.
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Affiliation(s)
- Anita Adamoczky
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary
| | - Miklós Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary
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Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
| | - Mahir Hashimov
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
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25
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Nagy M, Szemán-Nagy G, Kiss A, Nagy ZL, Tálas L, Rácz D, Majoros L, Tóth Z, Szigeti ZM, Pócsi I, Kéki S. Antifungal Activity of an Original Amino-Isocyanonaphthalene (ICAN) Compound Family: Promising Broad Spectrum Antifungals. Molecules 2020; 25:molecules25040903. [PMID: 32085460 PMCID: PMC7070524 DOI: 10.3390/molecules25040903] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 02/11/2020] [Accepted: 02/13/2020] [Indexed: 02/07/2023] Open
Abstract
: Multiple drug resistant fungi pose a serious threat to human health, therefore the development of completely new antimycotics is of paramount importance. The in vitro antifungal activity of the original, 1-amino-5-isocyanonaphthalenes (ICANs) was evaluated against reference strains of clinically important Candida species. Structure-activity studies revealed that the naphthalene core and the isocyano- together with the amino moieties are all necessary to exert antifungal activity. 1,1-N-dimethylamino-5-isocyanonaphthalene (DIMICAN), the most promising candidate, was tested further in vitro against clinical isolates of Candida species, yielding a minimum inhibitory concentration (MIC) of 0.04-1.25 µg/mL. DIMICAN was found to be effective against intrinsically fluconazole resistant Candida krusei isolates, too. In vivo experiments were performed in a severly neutropenic murine model inoculated with a clinical strain of Candida albicans. Daily administration of 5 mg/kg DIMICAN intraperitoneally resulted in 80% survival even at day 13, whereas 100% of the control group died within six days. Based on these results, ICANs may become an effective clinical lead compound family against fungal pathogens.
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Affiliation(s)
- Miklós Nagy
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (M.N.); (Z.L.N.); (D.R.)
| | - Gábor Szemán-Nagy
- Department of Molecular Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (G.S.-N.); (A.K.); (L.T.); (Z.M.S.)
| | - Alexandra Kiss
- Department of Molecular Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (G.S.-N.); (A.K.); (L.T.); (Z.M.S.)
| | - Zsolt László Nagy
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (M.N.); (Z.L.N.); (D.R.)
| | - László Tálas
- Department of Molecular Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (G.S.-N.); (A.K.); (L.T.); (Z.M.S.)
| | - Dávid Rácz
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (M.N.); (Z.L.N.); (D.R.)
| | - László Majoros
- Department of Medical Microbiology, Faculty of Medicine, University of Debrecen, 1 Egyetem tér, 4010 Debrecen, Hungary; (L.M.); (Z.T.)
| | - Zoltán Tóth
- Department of Medical Microbiology, Faculty of Medicine, University of Debrecen, 1 Egyetem tér, 4010 Debrecen, Hungary; (L.M.); (Z.T.)
| | - Zsuzsa Máthéné Szigeti
- Department of Molecular Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (G.S.-N.); (A.K.); (L.T.); (Z.M.S.)
| | - István Pócsi
- Department of Molecular Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (G.S.-N.); (A.K.); (L.T.); (Z.M.S.)
- Correspondence: (I.P.); (S.K.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary; (M.N.); (Z.L.N.); (D.R.)
- Correspondence: (I.P.); (S.K.)
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Nagy L, Kuki Á, Nagy T, Vadkerti B, Erdélyi Z, Kárpáti L, Zsuga M, Kéki S. Encoding Information into Polyethylene Glycol Using an Alcohol-Isocyanate "Click" Reaction. Int J Mol Sci 2020; 21:ijms21041318. [PMID: 32075293 PMCID: PMC7072859 DOI: 10.3390/ijms21041318] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/07/2020] [Accepted: 02/12/2020] [Indexed: 11/29/2022] Open
Abstract
In this article, the capability of encoding information using a homologous series of monodisperse monomethoxypolyethylene glycols (mPEG), with a number of ethylene oxide units ranging from nEO = 5 to 8, and monodisperse linear aliphatic isocyanates containing a number of CH2 units from 3 to 7, is demonstrated. The “click” reaction of the two corresponding homologous series yielded 20 different isocyanate end-capped polyethylene glycol derivatives (mPEG-OCONHR) whose sodiated adduct ion’s nominal m/z values spanned from 360 to 548, providing an average ca. 8 m/z unit for the storage of one-bit information. These mPEG-OCONHR oligomers were then used to encode information in binary sequences using a 384-well MALDI sample plate and employing the common dried-droplet sample preparation method capable of encoding 20 bit, i.e., 2.5 byte information in one spot, was employed. The information stored in the spots was read by MALDI-TOF MS using the m/z value of the corresponding mPEG-OCONHR oligomers. The capability of the method to store data was demonstrated by writing and reading a text file, visualizing a small picture and capturing a short audio file written in Musical Instrument Digital Interface (MIDI) sequence. Due to the very large similarities in the chemical structures of the encoding oligomers and their “easy to be ionized” property, as well as their very similar ionization efficiencies, the MALDI-TOF MS signal intensities from each compound was so strong and unambiguous that complete decoding could be performed in each case. In addition, the set of the proposed encoding oligomers can be further extended to attain higher bit “densities”.
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Affiliation(s)
- Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary; (L.N.); (Á.K.); (T.N.); (B.V.); (M.Z.)
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary; (L.N.); (Á.K.); (T.N.); (B.V.); (M.Z.)
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary; (L.N.); (Á.K.); (T.N.); (B.V.); (M.Z.)
| | - Bence Vadkerti
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary; (L.N.); (Á.K.); (T.N.); (B.V.); (M.Z.)
- Doctoral School of Chemistry, University of Debrecen, H-4032 Debrecen, Hungary
| | - Zoltán Erdélyi
- Department of Solid State Physics, Faculty of Science and Technology, University of Debrecen, H-4002 Debrecen, Hungary;
| | - Levente Kárpáti
- Department of Organic Chemistry, Faculty of Pharmacy, Semmelweis University, H-1092 Budapest, Hungary;
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary; (L.N.); (Á.K.); (T.N.); (B.V.); (M.Z.)
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Hungary; (L.N.); (Á.K.); (T.N.); (B.V.); (M.Z.)
- Correspondence:
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Kéki S. Functional Polyurethanes-In Memory of Prof. József Karger-Kocsis. Polymers (Basel) 2020; 12:polym12020434. [PMID: 32069776 PMCID: PMC7077621 DOI: 10.3390/polym12020434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 02/10/2020] [Indexed: 11/16/2022] Open
Affiliation(s)
- Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Debrecen, Egyetem tér 1., Hungary
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Todea A, Bîtcan I, Aparaschivei D, Păușescu I, Badea V, Péter F, Gherman VD, Rusu G, Nagy L, Kéki S. Biodegradable Oligoesters of ε-Caprolactone and 5-Hydroxymethyl-2-Furancarboxylic Acid Synthesized by Immobilized Lipases. Polymers (Basel) 2019; 11:E1402. [PMID: 31455024 PMCID: PMC6780942 DOI: 10.3390/polym11091402] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 08/22/2019] [Accepted: 08/23/2019] [Indexed: 12/19/2022] Open
Abstract
Following the latest developments, bio-based polyesters, obtained from renewable raw materials, mainly carbohydrates, can be competitive for the fossil-based equivalents in various industries. In particular, the furan containing monomers are valuable alternatives for the synthesis of various new biomaterials, applicable in food additive, pharmaceutical and medical field. The utilization of lipases as biocatalysts for the synthesis of such polymeric compounds can overcome the disadvantages of high temperatures and metal catalysts, used by the chemical route. In this work, the enzymatic synthesis of new copolymers of ε-caprolactone and 5-hydroxymethyl-2-furancarboxylic acid has been investigated, using commercially available immobilized lipases from Candida antarctica B. The reactions were carried out in solvent-less systems, at temperatures up to 80 °C. The structural analysis by MALDI TOF-MS, NMR, and FT-IR spectroscopy confirmed the formation of cyclic and linear oligoesters, with maximal polymerization degree of 24 and narrow molecular weight distribution (dispersity about 1.1). The operational stability of the biocatalyst was explored during several reuses, while thermal analysis (TG and DSC) indicated a lower thermal stability and higher melting point of the new products, compared to the poly(ε-caprolactone) homopolymer. The presence of the heterocyclic structure in the polymeric chain has promoted both the lipase-catalyzed degradation and the microbial degradation. Although, poly(ε-caprolactone) is a valuable biocompatible polymer with important therapeutic applications, some drawbacks such as low hydrophilicity, low melting point, and relatively slow biodegradability impeded its extensive utilization. In this regard the newly synthesized furan-based oligoesters could represent a "green" improvement route.
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Affiliation(s)
- Anamaria Todea
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania
| | - Ioan Bîtcan
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania
| | - Diana Aparaschivei
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania
| | - Iulia Păușescu
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania
| | - Valentin Badea
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania
| | - Francisc Péter
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania.
| | - Vasile Daniel Gherman
- Faculty of Civil Engineering, Hydrotechnical Department, Politehnica University of Timisoara, Victoriei Sq. 2, 30006 Timisoara, Romania
| | - Gerlinde Rusu
- University Politehnica Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, Biocatalysis Group, C. Telbisz 6, 300001 Timisoara, Romania
| | - Lajos Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Egyetem tér 1, 4032 Debrecen, Hungary.
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, H-4032 Egyetem tér 1, 4032 Debrecen, Hungary
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Kovács SL, Nagy M, Fehér PP, Zsuga M, Kéki S. Effect of the Substitution Position on the Electronic and Solvatochromic Properties of Isocyanoaminonaphthalene (ICAN) Fluorophores. Molecules 2019; 24:molecules24132434. [PMID: 31269691 PMCID: PMC6650821 DOI: 10.3390/molecules24132434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/26/2019] [Accepted: 06/30/2019] [Indexed: 11/16/2022] Open
Abstract
The properties of 1,4-isocyanoaminonaphthalene (1,4-ICAN) and 2,6-isocyanoaminonaphthalene (2,6-ICAN) isomers are discussed in comparison with those of 1,5-isocyanoaminonaphthalene (1,5-ICAN), which exhibits a large positive solvatochromic shift similar to that of Prodan. In these isocyanoaminonaphthalene derivatives, the isocyano and the amine group serve as the donor and acceptor moieties, respectively. It was found that the positions of the donor and the acceptor groups in these naphthalene derivatives greatly influence the Stokes and solvatochromic shifts, which decrease in the following order: 1,5-ICAN > 2,6-ICAN > 1,4-ICAN. According to high-level quantum chemical calculations, this order is well correlated with the charge transfer character of these compounds upon excitation. Furthermore, unlike 1,5-ICAN, the 1,4-ICAN and 2,6-ICAN isomers showed relatively high quantum yields in water, that were determined to be 0.62 and 0.21, respectively. In addition, time-resolved fluorescence experiments revealed that both the radiative and non-radiative decay rates for these three ICAN isomers varied unusually with the solvent polarity parameter ET(30). The explanations of the influence of the solvent polarity on the resulting steady-state and time-resolved fluorescence emission spectra are also discussed.
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Affiliation(s)
- Sándor Lajos Kovács
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
| | - Miklós Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Péter Pál Fehér
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2., H-1519 Budapest, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary
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Nagy M, Rácz D, Nagy ZL, Fehér PP, Kovács SL, Bankó C, Bacsó Z, Kiss A, Zsuga M, Kéki S. Amino-isocyanoacridines: Novel, Tunable Solvatochromic Fluorophores as Physiological pH Probes. Sci Rep 2019; 9:8250. [PMID: 31160696 PMCID: PMC6547668 DOI: 10.1038/s41598-019-44760-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 05/23/2019] [Indexed: 11/09/2022] Open
Abstract
Amino-isocyanoacridines (ICAAcs), as first members of their class, turned out to be a novel, multifunctional acridine orange (AO) type dye family with a number of additional favorable properties. They have enhanced solvatochromic emission range, low quantum yields (ΦF = 2.9-0.4%) in water, reduced basicity (pKa = 7.05-7.58), and their optical behavior could be fine-tuned by complexation with Ag(I) ions, too. Based on both their vibronic absorption and the charge transfer bands, ICAAcs can be applied as stable pH-probes with great precision (2-3% error) in the physiological pH range of 6-8 using UV-vis and fluorescence detection. The dyes are also able to sense pH change in different microenvironments, such as the Stern layer, as it was demonstrated on sodium lauryl sulfate micelles. The optical behavior of the ICAAc derivatives is discussed based on high-level quantum chemical calculations. All three dyes are well-applicable with conventional epifluorescence imaging. Furthermore, at the blue excitation, diMICAAc is optimally suited as a whole-cell probe for both the conventional microscopic and the laser-illumination studies, like flow- and imaging cytometric, or confocal laser-scanning microscopic examinations.
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Affiliation(s)
- Miklós Nagy
- Department of Applied Chemistry, University of Debrecen, 4010, Debrecen, Hungary
| | - Dávid Rácz
- Department of Applied Chemistry, University of Debrecen, 4010, Debrecen, Hungary
| | - Zsolt László Nagy
- Department of Applied Chemistry, University of Debrecen, 4010, Debrecen, Hungary
| | - Péter Pál Fehér
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Magyar tudósok körútja 2, Budapest, Hungary
| | - Sándor Lajos Kovács
- Department of Applied Chemistry, University of Debrecen, 4010, Debrecen, Hungary
| | - Csaba Bankó
- University of Debrecen, Medical and Health Science Center, Faculty of Medicine, Department of Biophysics and Cell Biology, 4010, Debrecen, Hungary
| | - Zsolt Bacsó
- University of Debrecen, Medical and Health Science Center, Faculty of Medicine, Department of Biophysics and Cell Biology, 4010, Debrecen, Hungary
| | - Alexandra Kiss
- Department of Biotechnology and Microbiology, Faculty of Science, University of Debrecen, Debrecen, 4010, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, 4010, Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, 4010, Debrecen, Hungary.
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Csecsei P, Várnai R, Nagy L, Kéki S, Molnár T, Illés Z, Farkas N, Szapáry L. L-arginine pathway metabolites can discriminate paroxysmal from permanent atrial fibrillation in acute ischemic stroke. Ideggyogy Sz 2019; 72:79-88. [PMID: 30957461 DOI: 10.18071/isz.72.0079] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Background and purpose Atrial fibrillation (AF) is the most common arrhythmia diagnosed in clinical practice. We aimed to measure the L-arginine pathway metabolites as well as their ratios in patients with different types of AF or sinus rhythm and to explore the relationship among the markers and clinical variables in the subacute phase of acute ischemic stroke (AIS). Methods A total of 46 patients with AIS were prospectively enrolled. The patients were divided into three groups based on diagnosis of either sinus rhythm, paroxysmal or permanent AF. Plasma concentration of the L-arginine pathway metabolites were analyzed at post-stroke 24 hours in the three rhythm groups. Besides, clinical variables and laboratory data were recorded. Results Asymmetric dimetylarginine (ADMA) was significantly higher in patients with permanent AF compared to sinus rhythm (p<0.001). Both ADMA (p<0.001) and symmetric dimethylarginine (SDMA) (p<0.002) at 24 hours were significantly higher among patients with permanent AF compared to those with paroxysmal AF. The L-arginine/SDMA (p<0.031) ratios at 24 hours were significantly higher among patients with sinus rhythm compared to those with permanent AF. ROC analysis also revealed that plasma SDMA cut-off level over 0.639 μmol/L discriminated permanent AF from paroxysmal AF or sinus rhythm with a 90.9% sensitivity and 77.1% specificity. Neutrophil-lymphocyte ratio also showed significantly higher value in individuals with both paroxysmal and permanent AF (p=0.029). Conclusion Plasma level of SDMA could discriminate permanent from paroxysmal AF in the subacute phase of ischemic stroke. In addition, an increased neutrophil-lymphocyte ratio may suggest inflammatory process in the evolution of atrial fibrillation.
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Affiliation(s)
- Péter Csecsei
- Department of Neurology, University of Pécs, Pécs, Hungary
| | | | - Lajos Nagy
- Department of Primary Health Care, University of Pécs, Pécs, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Debrecen, Hungary
| | - Tihamér Molnár
- Department of Anaesthesiology and Intensive Care, University of Pécs, Pécs, Hungary
| | - Zsolt Illés
- Department of Neurology, University of Pécs, Pécs, Hungary.,Department of Neurology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Nelli Farkas
- Institue of Bioanalysis, University of Pécs, Pécs, Hungary
| | - László Szapáry
- Department of Neurology, University of Pécs, Pécs, Hungary
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Nagy M, Kovács SL, Nagy T, Rácz D, Zsuga M, Kéki S. Isocyanonaphthalenes as extremely low molecular weight, selective, ratiometric fluorescent probes for Mercury(II). Talanta 2019; 201:165-173. [PMID: 31122408 DOI: 10.1016/j.talanta.2019.04.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 03/31/2019] [Accepted: 04/03/2019] [Indexed: 12/14/2022]
Abstract
The specially designed chemical structure of our recently developed solvatochromic amino-isocyanonaphthalene (ICAN) dye family enables the selective detection of Hg2+ and at the same time is able to indicate the presence of Ag+. In addition to its easy preparation and nontoxic nature, ICAN is the lowest molecular weight dye reported for ratiometric fluorescent Hg2+ detection in water, so far. The basis of this double selectivity is the reduction of the isonitrile moiety to amine by a chemical reaction with Hg2+ resulting in a greater than 100 nm hypsochromic shift (and switch on of fluorescence) of the emission maximum relative to ICAN, whereas the complexation of Ag+ with the NC group yields an approximately 20 nm bathochromic shift (and quenching). In contrast, other common ions have little effect on the position of the emission maximum in aqueous medium. In completely aqueous medium at pH = 6, the limit of quantification was found to be lower than 17 nM and the limit of detection lower than 6 nM for Hg2+. The practical applicability of the method was demonstrated on dental amalgam.
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Affiliation(s)
- Miklós Nagy
- Department of Applied Chemistry, University of Debrecen, H-4032, Debrecen, Hungary
| | - Sándor Lajos Kovács
- Department of Applied Chemistry, University of Debrecen, H-4032, Debrecen, Hungary
| | - Tibor Nagy
- Department of Applied Chemistry, University of Debrecen, H-4032, Debrecen, Hungary
| | - Dávid Rácz
- Department of Applied Chemistry, University of Debrecen, H-4032, Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, H-4032, Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, H-4032, Debrecen, Hungary.
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Nagy T, Kuki Á, Nagy M, Zsuga M, Kéki S. Mass-Remainder Analysis (MARA): An Improved Method for Elemental Composition Assignment in Petroleomics. Anal Chem 2019; 91:6479-6486. [PMID: 30912635 DOI: 10.1021/acs.analchem.8b04976] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Data processing and visualization methods have an important role in the mass spectrometric study of crude oils and other natural samples. The recently invented data mining procedure, Mass-Remainder Analysis (MARA), was further developed for use in petroleomics. MARA is based on the calculation of the remainder after dividing by the exact mass of a base unit, in petroleomics by the mass of the CH2 group. The two key steps in the MARA algorithm are the separation of the monoisotopic peaks from the other isotopic peaks and the subsequent intensity correction. The effectiveness of our MARA method was demonstrated on the analysis of lubricating mineral oil and crude oil samples by ultra-high-resolution Fourier transform ion cyclotron resonance mass spectrometry experiments. MARA is able to handle a huge portion of the overlapped peaks even in a moderate resolution mass spectrum. With use of MARA, effective chemical composition assignment and visual representation were achieved for complex mass spectra recorded by a time-of-flight analyzer with a limited resolution of 40 000 at m/ z 400. In the absence of an ultra-high-resolution mass analyzer, MARA can provide a closer look on the mass spectral peaks, like a digital zoom in a simple camera.
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Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Miklós Nagy
- Department of Applied Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
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Abstract
The reactions of 2′-benzyloxyflavanones 9b,c with thallium(III) nitrate or iodobenzene diacetate in the presence of perchloric or sulfuric acid in trimethyl orthoformate was studied. Depending on the substitution pattern and the conditions, these compounds underwent 2-aryl migration (9b → 11a) and/or ring contraction (9c → 10b + 11b) and dehydrogenation (9c → 12). A probable mechanism of these transformations is discussed.
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Affiliation(s)
- István Németh
- Department of Organic Chemistry, University of Debrecen, H-4010 Debrecen, P.O. Box 20, Hungary
| | - Katalin Gulácsi
- Department of Organic Chemistry, University of Debrecen, H-4010 Debrecen, P.O. Box 20, Hungary
| | - Sándor Antus
- Department of Organic Chemistry, University of Debrecen, H-4010 Debrecen, P.O. Box 20, Hungary
- Research Group of Carbohydrates of the Hungarian Academy of Sciences, H-4010 Debrecen, P.O. Box 55, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, H-4010 Debrecen, P.O. Box 1, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, H-4010 Debrecen, P.O. Box 1, Hungary
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Kuki Á, Nagy T, Hashimov M, File S, Nagy M, Zsuga M, Kéki S. Mass Spectrometric Characterization of Epoxidized Vegetable Oils. Polymers (Basel) 2019; 11:polym11030394. [PMID: 30960377 PMCID: PMC6473735 DOI: 10.3390/polym11030394] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/20/2019] [Accepted: 02/22/2019] [Indexed: 11/16/2022] Open
Abstract
Matrix-assisted laser desorption ionization and electrospray ionization mass spectrometry (MALDI-MS and ESI-MS) were used for the characterization of epoxidized soybean and linseed oils, which are important raw materials in the biopolymer production. The recently invented data mining approach, mass-remainder analysis (MARA), was implemented for the analysis of these types of complex natural systems. Different epoxidized triglyceride mass spectral peak series were identified, and the number of carbon atoms and epoxide groups was determined. The fragmentation mechanisms of the epoxidized triglyceride (ETG) adducts formed with different cations (such as H+, Na+, Li+, and NH4+) were explored. As a novel approach, the evaluation of the clear fragmentation pathways of the sodiated ETG adducts enabled the estimation of the epoxidized fatty acid compositions of these types of oils by MS/MS.
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Affiliation(s)
- Ákos Kuki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Tibor Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Mahir Hashimov
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Stella File
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Miklós Nagy
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Miklós Zsuga
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1., H-4032 Debrecen, Hungary.
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Kuki Á, Zelei G, Nagy L, Nagy T, Zsuga M, Kéki S. Rapid mapping of various chemicals in personal care and healthcare products by direct analysis in real time mass spectrometry. Talanta 2019; 192:241-247. [PMID: 30348385 DOI: 10.1016/j.talanta.2018.09.054] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 09/14/2018] [Accepted: 09/17/2018] [Indexed: 10/28/2022]
Abstract
Residual chemicals on personal care and healthcare products, such as sanitary articles, sterile gauze bandages, nappies, plasters, were studied by direct analysis in real time mass spectrometry (DART-MS). We have identified around 40 compounds in seventeen different commercially available items. The tentative identification was further supported for about half of the chemicals by tandem mass spectrometric experiments (DART MS/MS). The most notable hazardous substances were tributyl phosphate, tris(2,4-di-tert-butylphenyl) phosphite, phthalic acid esters, erucamide, and nonylphenol ethoxylates (NPEs). In addition, we developed an efficient DART-MS analysis to determine the concentration of NPE in a swab sample. The quantitative result obtained by DART-MS was confirmed by liquid chromatography with mass spectrometric detection (LC-MS).
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Affiliation(s)
- Ákos Kuki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Georgina Zelei
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Tibor Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
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Nagy L, Vadkerti B, Batta G, Fehér PP, Zsuga M, Kéki S. Eight out of eight: a detailed kinetic study on the reactivities of the eight hydroxyl groups of sucrose with phenyl isocyanate. NEW J CHEM 2019. [DOI: 10.1039/c9nj03569a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three primary OH groups of sucrose were found to be the most reactive as confirmed by mass spectrometric and NMR methods.
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Affiliation(s)
- Lajos Nagy
- Department of Applied Chemistry
- Faculty of Sciences and Technology
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Bence Vadkerti
- Department of Applied Chemistry
- Faculty of Sciences and Technology
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Gyula Batta
- Department of Organic Chemistry
- Faculty of Sciences and Technology
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Péter Pál Fehér
- Institute of Organic Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry
- Faculty of Sciences and Technology
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Sándor Kéki
- Department of Applied Chemistry
- Faculty of Sciences and Technology
- University of Debrecen
- H-4032 Debrecen
- Hungary
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Kovács E, Deme J, Turczel G, Nagy T, Farkas V, Trif L, Kéki S, Huszthy P, Tuba R. Synthesis and supramolecular assembly of fluorinated biogenic amine recognition host polymers. Polym Chem 2019. [DOI: 10.1039/c9py00929a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorine functionalized biogenic amine carrier polymers.
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Affiliation(s)
- Ervin Kovács
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - János Deme
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - Gábor Turczel
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - Tibor Nagy
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - Vajk Farkas
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - László Trif
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
| | - Sándor Kéki
- Department of Applied Chemistry
- University of Debrecen
- H-4032 Debrecen
- Hungary
| | - Péter Huszthy
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- H-1111 Budapest
- Hungary
| | - Robert Tuba
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1519 Budapest
- Hungary
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Nagy T, Kuki Á, Zsuga M, Kéki S. Reply to Comment on “Mass-Remainder Analysis (MARA): A New Data Mining Tool for Copolymer Characterization” (An Example of Multiple Discovery). Anal Chem 2018; 90:8719-8720. [DOI: 10.1021/acs.analchem.8b01886] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry, University of Debrecen, Debrecen, Hungary H-4010
| | - Ákos Kuki
- Department of Applied Chemistry, University of Debrecen, Debrecen, Hungary H-4010
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Debrecen, Hungary H-4010
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Debrecen, Hungary H-4010
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40
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Czifrák K, Lakatos C, Karger-Kocsis J, Daróczi L, Zsuga M, Kéki S. One-Pot Synthesis and Characterization of Novel Shape-Memory Poly(ε-Caprolactone) Based Polyurethane-Epoxy Co-networks with Diels⁻Alder Couplings. Polymers (Basel) 2018; 10:E504. [PMID: 30966538 PMCID: PMC6415404 DOI: 10.3390/polym10050504] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 05/02/2018] [Accepted: 05/03/2018] [Indexed: 12/02/2022] Open
Abstract
The present work aimed at the preparation and investigation of different epoxy-polyurethane (EP-PU) co-networks. The EP-PU co-networks were obtained by applying two different synthetic strategies, in which the coupling element, the Diels⁻Alder (DA) adduct, was prepared previously or formed "in situ" in the reaction between furan functionalized polyurethane and furfuryl amine-diglycidyl ether bisphenol-A oligomers (FA_DGEBA). For the synthesis of these EP-PU networks, poly(ε-caprolactone)-diol (PCD, Mn = 2 kg/mol) and poly(ε-caprolactone) (PCL) with different molecular weights (Mn = 10, 25 and 50 kg/mol) and 1,6-hexamethylenediisocyanate (HDI) were used. The EP-PU co-networks were characterized by Attenuated Total Reflectance Fourier-Transform Infrared spectroscopy (AT-FT-IR), differential scanning calorimetry (DSC) and dynamical mechanical analysis (DMA). Scanning electron microscopy (SEM) was applied to assess the morphology of the EP-PU samples. It was demonstrated that the stress⁻strain curves for the EP-PUs could be interpreted based on the Standard Linear Solid (SLS) model. The DMA traces of some EP-PUs (depending on the composition and the synthetic method) revealed a plateau-like region above the melting temperature (Tm) of PCL confirming the presence of cross-linked structure. This feature predicted shape memory (SM) behavior for these EP-PU samples. Indeed, very good shape fixity and moderate shape recovery were obtained. The shape recovery processes of these EP-PU samples were described using double exponential decay functions.
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Affiliation(s)
- Katalin Czifrák
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
| | - Csilla Lakatos
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
| | - József Karger-Kocsis
- Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
- MTA⁻BME Research Group for Composite Science and Technology, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Lajos Daróczi
- Department of Solid State Physics, University of Debrecen, Bem tér 18/b, H-4026 Debrecen, Hungary.
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
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Nagy M, Kéki S, Rácz D, Mathur J, Vereb G, Garda T, M-Hamvas M, Chaumont F, Bóka K, Böddi B, Freytag C, Vasas G, Máthé C. Novel fluorochromes label tonoplast in living plant cells and reveal changes in vacuolar organization after treatment with protein phosphatase inhibitors. Protoplasma 2018; 255:829-839. [PMID: 29230547 DOI: 10.1007/s00709-017-1190-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 11/27/2017] [Indexed: 06/07/2023]
Abstract
The recently synthesized isocyanonaphtalene derivatives ACAIN and CACAIN are fluorochromes excitable at wavelengths of around 366 nm and bind cysteine-rich proteins with hydrophobic motifs. We show that these compounds preferentially label tonoplasts in living Arabidopsis and tobacco (Nicotiana tabacum SR1) cells. ACAIN-labeled membranes co-localized with the GFP signal in plants expressing GFP-δ-TIP (TIP2;1) (a tonoplast aquaporin) fusion protein. ACAIN preserved the dynamics of vacuolar structures. tip2;1 and triple tip1;1-tip1;2-tip2;1 knockout mutants showed weaker ACAIN signal in tonoplasts. The fluorochrome is also suitable for the labeling and detection of specific (cysteine-rich, hydrophobic) proteins from crude cell protein extracts following SDS-PAGE and TIP mutants show altered labeling patterns; however, it appears that ACAIN labels a large variety of tonoplast proteins. ACAIN/CACAIN could be used for the detection of altered vacuolar organization induced by the heptapeptide natural toxin microcystin-LR (MCY-LR), a potent inhibitor of both type 1 and 2A protein phosphatases and a ROS inducer. As revealed both in plants with GFP-TIP2;1 fusions and in wild-type (Columbia) plants labeled with ACAIN/CACAIN, MCY-LR induces the formation of small vesicles, concomitantly with the absence of the large vegetative vacuoles characteristic for differentiated cells. TEM studies of MCY-LR-treated Arabidopsis cells proved the presence of multimembrane vesicles, with characteristics of lytic vacuoles or autophagosomes. Moreover, MCY-LR is a stronger inducer of small vesicle formation than okadaic acid (which inhibits preferentially PP2A) and tautomycin (which inhibits preferentially PP1). ACAIN and CACAIN emerge as useful novel tools to study plant vacuole biogenesis and programmed cell death.
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Affiliation(s)
- Miklós Nagy
- Faculty of Science and Technology, Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Sándor Kéki
- Faculty of Science and Technology, Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Dávid Rácz
- Faculty of Science and Technology, Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Jaideep Mathur
- Department of Molecular and Cellular Biology, Laboratory of Plant Development and Interactions, University of Guelph, 50 Stone Road, Guelph, ON, N1G2W1, Canada
| | - György Vereb
- Faculty of Medicine, Department of Biophysics and Cell Biology, University of Debrecen, Debrecen, Hungary
| | - Tamás Garda
- Faculty of Science and Technology, Department of Botany, University of Debrecen, Debrecen, Hungary
| | - Márta M-Hamvas
- Faculty of Science and Technology, Department of Botany, University of Debrecen, Debrecen, Hungary
| | - François Chaumont
- Institut des Sciences de la Vie, Université catholique de Louvain, B-1348, Louvain-la-Neuve, Belgium
| | - Károly Bóka
- ELTE Eötvös Loránd University, Department of Plant Anatomy, Institute of Biology, Faculty of Science, Pázmány P. s. 1/c, Budapest, H-1117, Hungary
| | - Béla Böddi
- ELTE Eötvös Loránd University, Department of Plant Anatomy, Institute of Biology, Faculty of Science, Pázmány P. s. 1/c, Budapest, H-1117, Hungary
| | - Csongor Freytag
- Faculty of Science and Technology, Department of Botany, University of Debrecen, Debrecen, Hungary
| | - Gábor Vasas
- Faculty of Science and Technology, Department of Botany, University of Debrecen, Debrecen, Hungary
| | - Csaba Máthé
- Faculty of Science and Technology, Department of Botany, University of Debrecen, Debrecen, Hungary.
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Nagy T, Kuki Á, Nagy L, Zsuga M, Kéki S. Rapid qualitative analysis of 2 flavonoids, rutin and silybin, in medical pills by direct analysis in real-time mass spectrometry (DART-MS) combined with in situ derivatization. J Mass Spectrom 2018; 53:240-246. [PMID: 29285822 DOI: 10.1002/jms.4061] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 12/15/2017] [Accepted: 12/21/2017] [Indexed: 06/07/2023]
Abstract
Direct analysis in real-time mass spectrometry (DART-MS) with in situ silylation was used for the rapid analysis of the flavonoids silybin ((2R,3R)-3,5,7-trihydroxy-2-[3-(4-hydroxy-3-methoxyphenyl)-2-hydroxymethyl-2,3-dihydrobenzo[1,4]dioxin-6-yl]chroman-4-one) and rutin (quercetin-3-O-rutinoside). Three different derivatization reagents, hexamethyldisilazane/trimethylchlorosilane/pyridine (HMDS/TMCS/pyridine), N,O-bis(trimethylsilyl)acetamide/trimethylchlorosilane/N-trimethylsilyimidazole (BSA/TMCS/TMSI), and N,O-bis(trimethylsilyl)trifluoroacetamide/trimethylchlorosilane (BSTFA/TMCS), were applied. Silybin and rutin were detected with various degrees of silylation, and the formation of dimers with pyridine and imidazole was also observed. HMDS/TMCS/pyridine was the best choice for the DART-MS analysis of silybin, and BSA/TMCS/TMSI was the most effective for the detection of rutin. The effects of the DART source temperature on desorption, ionization, in-source fragmentation, dimer formation, and hydrolysis of the trimethylsilyl groups were also studied. In addition, the collision-induced dissociation properties of the derivatized silybin and rutin were explored. With our in situ silylation method, the derivatized bioactive compounds in intact medical pills could also be detected by DART-MS.
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Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
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Abstract
A new data mining method is proposed for the determination of the copolymer composition from moderate/low resolution complex mass spectra. The Mass-remainder analysis (MARA) does not require a "Kendrick-like" transformation to a new mass scale, it is simply based on the calculation of the remainder after dividing by the exact mass of one of the repeat units of the copolymer (e.g., B of an A/B copolymer). Plotting the remainder of this division (MR) versus m/ z the homologous series differing only by a number of base units (e.g., B unit) can be visualized. The number of A units ( nA) and subsequently nB is assigned to the m/ z peaks using the bijective nA, MR mapping. Simultaneously, our algorithm removes the isotopes from the peak list. However, the intensities of the monoisotopes are increased to the value corresponding, approximately, to the total intensity of their isotope peaks. The correction of the mass spectral peak intensities enables the accurate calculation of the usual polymer and copolymer quantities: the molecular weight-average, the number-averaged molecular weight of A and B units, the composition drift, or the bivariate distribution, among others. Our Mass-remainder analysis method was demonstrated by the analysis of various ethylene oxide/propylene oxide copolymers.
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Affiliation(s)
- Tibor Nagy
- Department of Applied Chemistry , University of Debrecen , H-4032 Debrecen , Egyetem tér 1. , Hungary
| | - Ákos Kuki
- Department of Applied Chemistry , University of Debrecen , H-4032 Debrecen , Egyetem tér 1. , Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry , University of Debrecen , H-4032 Debrecen , Egyetem tér 1. , Hungary
| | - Sándor Kéki
- Department of Applied Chemistry , University of Debrecen , H-4032 Debrecen , Egyetem tér 1. , Hungary
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Nagy Z, Nagy M, Kiss A, Rácz D, Barna B, Könczöl P, Bankó C, Bacsó Z, Kéki S, Banfalvi G, Szemán-Nagy G. MICAN, a new fluorophore for vital and non-vital staining of human cells. Toxicol In Vitro 2018; 48:137-145. [PMID: 29357300 DOI: 10.1016/j.tiv.2018.01.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 12/11/2017] [Accepted: 01/15/2018] [Indexed: 12/27/2022]
Abstract
Fluorescence time-lapse microscopy is in connection with the invasive properties of fluorochrome applied, and with the toxicity of the excitation energy and wavelength of the dye itself. Experiments with the newly synthesized fluorescent dye 1-N-methylamino-5-isocyanonaphthalene (MICAN) served to test its cytotoxicity on human HaCaT keratinocyte cell cultures. Experiments related to staining capability were performed with paraformaldehyde (PFA) fixed cells and observed with fluorescence microscope. It was assumed that the fluorophore 1-amino-5-isocyanonaphthalene (ICAN) and especially its N-methylamino derivative MICAN, containing condensed aromatic rings could serve as a nonselective fluorescent dye capable to stain cellular structures of fixed, living, damaged and dead cells. This notion was confirmed by the MICAN staining of cytoplasmic proteins primarily rough endoplasmic reticulum (RER), smooth endoplasmic reticulum (SEM) and less efficiently nuclear proteins suggesting the involvement of staining of subcellular structures involved in protein synthesis. MICAN was not only well tolerated by living cells but turned out to be a strong heterochromatin and RER staining agent. This led to the development of a MICAN staining protocol for native and living samples. Relative to other fluorescent dyes, MICAN is not only useful but also cost-effective. Toxicology tests were performed using 30, 10, 5, 0.5 μg/ml MICAN concentrations. Time-lapse videomicroscopy at near-infrared (NIR) illumination has been used for the examination of MICAN effect on cell division. It was found that MICAN as a vital stain had no significant harmful effect on HaCaT cells. MICAN turned out to be a non-toxic, highly quantum-efficient vital stain with minimal, or no photobleaching, and can be applied to co-stain with propidium-iodide due the strong spectral separation.
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Affiliation(s)
- Zsolt Nagy
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010, Hungary
| | - Miklós Nagy
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010, Hungary
| | - Alexandra Kiss
- Department of Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010, Hungary
| | - Dávid Rácz
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010, Hungary
| | - Beatrix Barna
- Department of Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010, Hungary
| | - Péter Könczöl
- Department of Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010, Hungary
| | - Csaba Bankó
- University of Debrecen, Medical and Health Science Center, Faculty of Medicine, Department of Biophysics and Cell Biology, 4010, Hungary
| | - Zsolt Bacsó
- University of Debrecen, Medical and Health Science Center, Faculty of Medicine, Department of Biophysics and Cell Biology, 4010, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, Faculty of Science, University of Debrecen, 4010, Hungary.
| | - Gaspar Banfalvi
- Department of Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010, Hungary.
| | - Gábor Szemán-Nagy
- Department of Biotechnology and Microbiology, Faculty of Science, University of Debrecen, 4010, Hungary
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Karger-Kocsis J, Kéki S. Review of Progress in Shape Memory Epoxies and Their Composites. Polymers (Basel) 2017; 10:E34. [PMID: 30966068 PMCID: PMC6415015 DOI: 10.3390/polym10010034] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 12/22/2017] [Accepted: 12/25/2017] [Indexed: 11/20/2022] Open
Abstract
Shape memory polymer (SMP) is capable of memorizing one or more temporary shapes and recovering successively to the permanent shape upon various external stimuli. Beside of the above mentioned one-way variants, also two-way shape memory polymers (SMPs) and shape memory (SM) systems exist which feature a reversible shape change on the basis of "on-off switching" of the external stimulus. The preparation, properties and modelling of shape memory epoxy resins (SMEP), SMEP foams and composites have been surveyed in this exhaustive review article. The underlying mechanisms and characteristics of SM were introduced. Emphasis was put to show new strategies on how to tailor the network architecture and morphology of EPs to improve their SM performance. To produce SMEPs novel preparation techniques, such as electrospinning, ink printing, solid-state foaming, were tried. The potential of SMEPs and related systems as multifunctional materials has been underlined. Added functionality may include, among others, self-healing, sensing, actuation, porosity control, recycling. Recent developments in the modelling of SMEPs were also highlighted. Based on the recent developments some open topics were deduced which are merit of investigations in future works.
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Affiliation(s)
- József Karger-Kocsis
- Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
- MTA⁻BME Research Group for Composite Science and Technology, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
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Nagy L, Nagy T, Kuki Á, Oláh R, Lakatos C, Zsuga M, Kéki S. Reactions of 2,6-Toluene Diisocyanate with Alcohols: Kinetic Studies in the Absence and Presence of Catalysts. ChemistrySelect 2017. [DOI: 10.1002/slct.201702251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lajos Nagy
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
| | - Tibor Nagy
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
| | - Ákos Kuki
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
| | - Réka Oláh
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
| | - Csilla Lakatos
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
| | - Sándor Kéki
- Department of Applied Chemistry; University of Debrecen; Egyetem tér 1 H-4032 Debrecen Hungary
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Hermenean A, Gheorghiu G, Stan MS, Herman H, Onita B, Ardelean DP, Ardelean A, Braun M, Zsuga M, Kéki S, Costache M, Dinischiotu A. Biochemical, Histopathological and Molecular Responses in Gills of Leuciscus cephalus Exposed to Metals. Arch Environ Contam Toxicol 2017; 73:607-618. [PMID: 28939958 DOI: 10.1007/s00244-017-0450-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Accepted: 09/06/2017] [Indexed: 06/07/2023]
Abstract
Gills are major targets for acute metal toxicity in fish, due to their permanent contact with aquatic pollutants. To assess the effects of metals on gills of the Leuciscus cephalus (chub), fish individuals were collected from two sites in the Tur River, Romania, in upstream (site 1) and downstream (site 2) of a metal pollution source. Quantitative and hyperspectral analyses showed that Zn, Sr, and Fe concentrations were significantly higher in gills from site 2 compared with site 1. Malondialdehyde and advanced oxidation protein products levels increased 17 and 28%, respectively, whereas reduced glutathione level diminished significantly in the gills of fish collected from site 2 compared to site 1. The activities of superoxide dismutase, catalase, and glutathione-S-transferase increased significantly at 41, 21, and 28%, respectively. Proliferating cell nuclear antigen (PCNA) protein levels, as well as the amount of DNA damage, were significantly increased for site 2 compared with site 1. The induced oxidative stress generated hyperplasia, hypertrophy, and inflammation in the epithelial cells and apoptosis. Hence, this could suggest that gill cells have tried to counteract the oxidative stress-induced DNA fragmentation by PCNA up-regulation, but the PCNA expression decreased on longer time due to the low level of GSH, resulting in apoptosis.
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Affiliation(s)
- Anca Hermenean
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414, Arad, Romania.
| | | | - Miruna Silvia Stan
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095, Bucharest, Romania
| | - Hildegard Herman
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414, Arad, Romania
| | - Bianca Onita
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414, Arad, Romania
| | - Doru Puiu Ardelean
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414, Arad, Romania
| | - Aurel Ardelean
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, 310414, Arad, Romania
| | - Mihály Braun
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen, 4032, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Debrecen, 4032, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Debrecen, 4032, Hungary
| | - Marieta Costache
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095, Bucharest, Romania
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095, Bucharest, Romania
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Kuki Á, Nagy L, Zsuga M, Kéki S. An approach to estimate the activation energies of fragmentation occurring in quadrupole collision cell of the mass spectrometer. J Mass Spectrom 2017; 52:672-680. [PMID: 28732136 DOI: 10.1002/jms.3971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 07/10/2017] [Accepted: 07/18/2017] [Indexed: 06/07/2023]
Abstract
The classical semi-quantitative Rice-Ramsperger-Kassel (RRK) theory was used for the calculation of the internal energy dependent reaction rate coefficient of the collision-induced dissociation (CID) reaction in tandem mass spectrometry (MS/MS). The survival yield (SY) was determined by the reaction rate equation for the unimolecular dissociation of the precursor ion. The parameters of the rate equation and the RRK model were approximated based on the instrumental conditions. We used the RRK equation for the description of the basic behavior of the fragmentation reactions and for the estimation of the internal energy of the precursor ion. The critical energies for fragmentation (Eo ) of various molecules were estimated and compared with those reported in the literature. The model was extended by taking into account the initial internal energy distribution of the ions created in the ion source. It must be emphasized that our approach provides only a crude estimate for Eo .
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Affiliation(s)
- Ákos Kuki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Lajos Nagy
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary
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Antal B, Kuki Á, Nagy L, Nagy T, Zsuga M, M-Hamvas M, Vasas G, Kéki S. Rapid Discrimination of Closely Related Seed Herbs (Cumin, Caraway, and Fennel) by Direct Analysis in Real Time Mass Spectrometry (DART-MS). ANAL SCI 2016; 32:1111-1116. [PMID: 27725613 DOI: 10.2116/analsci.32.1111] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Direct analysis in real time mass spectrometry (DART-MS) was applied as a rapid method for the discrimination of the spices and traditional medicines cumin (Cuminum cyminum L.), caraway (Carum carvi L.), and fennel (Foeniculum vulgare Mill.). The seeds of these plants were analyzed without sample preparation by DART ion source coupled with quadrupole time-of-flight (QTOF) tandem mass spectrometry. The relatively clean DART spectra showed characteristic patterns, fingerprints, for each herb. It was found that a marker compound can be assigned to each species that can identify unambiguously these plants. Principal component analysis has also been used to analyze the DART-MS data of these seed herbs. Crispanone, carvone, and fenchone are the dominant compounds in the positive DART spectra of cumin, caraway, and fennel, respectively. Crispanone was first time identified as a constituent of cumin. Furthermore, the collision-induced dissociation (CID) behavior of the [M+NH4]+ ion of crispanone was also described.
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Affiliation(s)
- Borbála Antal
- Department of Applied Chemistry, University of Debrecen
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Nagy L, Kuki Á, Deák G, Purgel M, Vékony Á, Zsuga M, Kéki S. Gas-Phase Interaction of Anions with Polyisobutylenes: Collision-Induced Dissociation Study and Quantum Chemical Modeling. J Phys Chem B 2016; 120:9195-203. [PMID: 27483334 DOI: 10.1021/acs.jpcb.6b05655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The gas-phase interaction of anions including fluoride, chloride, bromide, iodide, ethyl sulfate, chlorate, and nitrate with polyisobutylene (PIB) derivatives was studied using collision-induced dissociation (CID). The gas-phase adducts of anions with PIBs ([PIB + anion](-)) were generated from the electrosprayed solution of PIBs in the presence of the corresponding anions. The so-formed adducts subjected to CID showed a loss of anion at different characteristic collision energies, thus allowing the study of the strength of interaction between the anions and nonpolar PIBs having different end-groups. The values of characteristic collision energies (the energy needed to obtain 50% fragmentation) obtained by CID experiments correlated linearly with the binding enthalpies between the anion and PIB, as determined by density functional theory calculations. In the case of halide ions, the critical energies for dissociation, that is, the binding enthalpies for [PIB + anion](-) adducts, increased in the order of I(-) < Br(-) < Cl(-) < F(-). Furthermore, it was found that the binding enthalpies for the adducts formed with halide ions decreased approximately with the square radius of the halide ion, suggesting that the strength of interaction is mainly determined by the "surface" charge density of the halide ion. In addition, the characteristic collision energy versus the number of isobutylene units revealed a linear dependence.
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Affiliation(s)
- Lajos Nagy
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Ákos Kuki
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
| | - György Deák
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Mihály Purgel
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Ádám Vékony
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Miklós Zsuga
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Sándor Kéki
- Department of Applied Chemistry and ‡Department of Physical Chemistry, MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , Egyetem tér 1, H-4032 Debrecen, Hungary
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