1
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Abo Elkheir SM, Nasr JJM, Walash MI, Zeid AM. Green spectrophotometric and spectrofluorimetric determination of biperiden hydrochloride using erythrosine B sensing probe. LUMINESCENCE 2024; 39:e4725. [PMID: 38532614 DOI: 10.1002/bio.4725] [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: 01/10/2024] [Revised: 02/15/2024] [Accepted: 02/27/2024] [Indexed: 03/28/2024]
Abstract
Erythrosine B (EB) is a food colorant antiviral xanthene dye that has many applications as a color additive in pharmaceuticals and cosmetics. Its use as a sensor for spectrofluorimetric and spectrophotometric analysis of amine-based pharmaceuticals renders many advantages because of its availability, low cost, rapid labeling, and high sensitivity. Herein, two fast and sensitive spectrofluorimetric and spectrophotometric methods were established for the estimation of the anti-Parkinson drug, biperiden (BIP) hydrochloride (HCl), in its raw material and tablet forms. The proposed methods depended on the interaction between the phenolic group of EB and the tertiary amino group of the studied analyte to form an ion-pair complex at pH 4 using the Britton Robinson buffer. The spectrofluorimetric method is based on the measurement of the quenching power of BIP HCl on the fluorescence intensity of EB at λex/em = 527.0/550.9 nm. This method was rectilinear over the concentration range of 0.1-1.0 μg/mL with a limit of detection (LOD) = 0.017 μg/mL and a limit of quantification (LOQ) = 0.05 μg/mL. Meanwhile, the colorimetric method involved monitoring the absorbance of the formed ion-pair complex at 555 nm, showing a linearity range of 0.4-5.0 μg/mL with LOD = 0.106 μg/mL and LOQ = 0.322 μg/mL. The proposed methods were assessed for the greenness, indicating the greenness of the developed methods.
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Affiliation(s)
- Shrouk M Abo Elkheir
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Jenny Jeehan M Nasr
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura National University, Gamasa, Egypt
| | - Mohamed I Walash
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Abdallah M Zeid
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA
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2
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Batakoushy HA, Hafez HM, Soliman MM, Mohamed TF, Ahmed AB, El Hamd MA. Isoquinoline-based intrinsic fluorescence assessment of erythropoiesis-stimulating agent, Roxadustat (FG-4592), in tablets: applications to content uniformity and human plasma evaluation. LUMINESCENCE 2024; 39:e4741. [PMID: 38605268 DOI: 10.1002/bio.4741] [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: 01/29/2024] [Revised: 03/09/2024] [Accepted: 03/15/2024] [Indexed: 04/13/2024]
Abstract
In the present study, a first validated and green spectrofluorimetric approach for its assessment and evaluation in different matrices was investigated. After using an excitation wavelength of 345 nm, Roxadustat (ROX) demonstrates a highly native fluorescence at an emission of 410 nm. The influences of experimental factors such as pH, diluting solvents, and different organized media were tested, and the most appropriate solvent choice was ethanol. It was confirmed that there was a linear relationship between the concentration of ROX and the relative fluorescence intensity in the range 60.0-1000.0 ng ml-1, with the limit of detection and limit of quantitation, respectively, being 17.0 and 53.0 ng ml-1. The mean recoveries % [±standard deviation (SD), n = 5] for pharmaceutical preparations were 100.11% ± 2.24%, whereas for plasma samples, they were 100.08 ± 1.08% (±SD, n = 5). The results obtained after the application of four greenness criteria, Analytical Eco-Scale metric, NEMI, GAPI, and AGREE metric, confirmed its eco-friendliness. In addition, the whiteness meter (RGB12) confirmed its level of sustainability. The International Council for Harmonisation (ICH) criteria were used to verify the developed method through the study in both spiked plasma samples and content uniformity evaluation. An appropriate standard for various applications in industry and quality control laboratories was developed.
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Affiliation(s)
- Hany A Batakoushy
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Menoufia University, Shibin El Kom, Egypt
| | - Hani M Hafez
- Department of Pharmaceutical Chemistry, College of Pharmacy, Al-Esraa University, Baghdad, Iraq
| | - Marwa M Soliman
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
| | - Tahany F Mohamed
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo, Egypt
| | - Amal B Ahmed
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Nahda University, Beni Suef, Egypt
| | - Mohamed A El Hamd
- Department of Pharmaceutical Chemistry, College of Pharmacy, Shaqra University, Shaqra, Saudi Arabia
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, South Valley University, Qena, Egypt
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3
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Saraya RE, Salman BI, Hassan YF, Hassan AI, Refaat SA, Batakoushy HA. Applicability of fluorescamine as a fluorogenic reagent for highly sensitive fluorimetric analysis of the tyrosine kinase inhibitor (avapritinib) in pharmaceuticals and biological samples. LUMINESCENCE 2023; 38:1632-1638. [PMID: 37417422 DOI: 10.1002/bio.4550] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 06/08/2023] [Accepted: 07/02/2023] [Indexed: 07/08/2023]
Abstract
Avapritinib (AVP) was the first precision drug to be approved by the US Food and Drug Administration (FDA) in 2020 for patients suffering from metastatic gastrointestinal stromal tumors (GISTs) and progressive systemic mastocytosis. The analysis of AVP in pharmaceutical tablets and human plasma was then carried out using a fast, efficient, sensitive, and simple fluorimetric method using a fluorescamine reagent. The procedure is based on the interaction between fluorescamine as a fluorogenic reagent and the primary aliphatic amine moiety in AVP using borate buffer solution at pH 8.8. The produced fluorescence was measured at 465 nm (Excitation at 395 nm). The calibration graph's linearity range was discovered to be 45.00-500.0 ng mL-1 . Utilizing the International Council for Harmonization (ICH) and US-FDA recommendations, the research technique was validated and bioanalytically validated. The proposed approach was effectively employed for determining the stated pharmaceuticals in plasma with a high percentage of recovery ranging from 96.87 to 98.09 and pharmaceutical formulations with a percentage of recovery equal to 102.11% ± 1.05%. In addition, the study was extended to a pharmacokinetic study of AVP with 20 human volunteers as a step for AVP management in therapeutic cancer centers.
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Affiliation(s)
- Roshdy E Saraya
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Port Said University, Port Said, Egypt
| | - Baher I Salman
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut, Egypt
| | - Yasser F Hassan
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut, Egypt
| | - Ahmed I Hassan
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut, Egypt
| | - Shymaa Abdelsattar Refaat
- Clinical Biochemistry and Molecular Diagnostics Department, National Liver Institute, Menoufia University, Shibin Elkom, Egypt
| | - Hany A Batakoushy
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Menoufia University, Shebin Elkom, Egypt
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4
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Baltzis D, Tsogas GZ, Zacharis CK, Tzanavaras PD. Smartphone-Based High-Throughput Fluorimetric Assay for Histidine Quantification in Human Urine Using 96-Well Plates. Molecules 2023; 28:6205. [PMID: 37687035 PMCID: PMC10488697 DOI: 10.3390/molecules28176205] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 08/22/2023] [Accepted: 08/22/2023] [Indexed: 09/10/2023] Open
Abstract
A high-throughput fluorimetric assay for histidine was developed, using a 96-well plates platform. The analyte reacts selectively with o-phthalaldehyde under mild alkaline conditions to form a stable derivative. Instrumental-free detection was carried out using a smartphone after illumination under UV light (365 nm). The method was proved to be linear up to 100 μM histidine, with an LLOQ (lower limit of quantification) of 10 μM. The assay was only prone to interference from glutathione and histamine that exist in the urine samples at levels that are orders of magnitude lower compared to histidine. Human urine samples were analyzed following minimum treatment and were found to contain histidine in the range of 280 to 1540 μM. The results were in good agreement with an HPLC corroborative method.
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Affiliation(s)
- Dimitrios Baltzis
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (D.B.); (G.Z.T.)
| | - George Z. Tsogas
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (D.B.); (G.Z.T.)
| | - Constantinos K. Zacharis
- Laboratory of Pharmaceutical Analysis, School of Pharmacy, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece;
| | - Paraskevas D. Tzanavaras
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (D.B.); (G.Z.T.)
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5
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Darie-Ion L, Petre BA. An update on multiplexed mass spectrometry-based lysosomal storage disease diagnosis. Mass Spectrom Rev 2023. [PMID: 37584312 DOI: 10.1002/mas.21864] [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] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 08/01/2023] [Accepted: 08/04/2023] [Indexed: 08/17/2023]
Abstract
Lysosomal storage disorders (LSDs) are a type of inherited metabolic disorders in which biomolecules, accumulate as a specific substrate in lysosomes due to specific individual enzyme deficiencies. Despite the fact that LSDs are incurable, various approaches, including enzyme replacement therapy, hematopoietic stem cell transplantation, or gene therapy are now available. Therefore, a timely diagnosis is a critical initial step in patient treatment. The-state-of-the-art in LSD diagnostic uses, in the first stage, enzymatic activity determination by fluorimetry or by mass spectrometry (MS) with the aid of dry blood spots, based on different enzymatic substrate structures. Due to its sensitivity, high precision, and ability to screen for an unprecedented number of diseases in a single assay, multiplexed tandem MS-based enzyme activity assays for the screening of LSDs in newborns have recently received a lot of attention. Here, (i) we review the current approaches used for simultaneous enzymatic activity determination of LSDs in dried blood spots using multiplex-LC-MS/MS; (ii) we explore the need for designing novel enzymatic substrates that generate different enzymatic products with distinct molecular masses in multiplexed-MS studies; and (iii) we give examples of the relevance of affinity-MS technique as a basis for reversing undesirable immune-reactivity in enzyme replacement therapy.
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Affiliation(s)
- Laura Darie-Ion
- Group of Biochemistry, Faculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Iaşi, Romania
| | - Brînduşa Alina Petre
- Group of Biochemistry, Faculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Iaşi, Romania
- Laboratory of Proteomics, Center for Fundamental Research and Experimental Development in Translation Medicine-TRANSCEND, Regional Institute of Oncology, Iaşi, Romania
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Terholsen H, Myrtollari K, Larva M, Möller C, Taden A, Kourist R, Bornscheuer UT, Kracher D. Spectrophotometric and Fluorimetric High-Throughput Assays for Phenolic Acid Decarboxylase. Chembiochem 2023; 24:e202300207. [PMID: 37191502 DOI: 10.1002/cbic.202300207] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 05/15/2023] [Accepted: 05/16/2023] [Indexed: 05/17/2023]
Abstract
Biocatalytic decarboxylation of hydroxycinnamic acids yields phenolic styrenes, which are important precursors for antioxidants, epoxy coatings, adhesives and other polymeric materials. Bacillus subtilis decarboxylase (BsPAD) is a cofactor-independent enzyme that catalyzes the cleavage of carbon dioxide from p-coumaric-, caffeic-, and ferulic acid with high catalytic efficiency. Real-time spectroscopic assays for decarboxylase reactions remove the necessity of extensive sample workup, which is required for HPLC, mass spectrometry, gas chromatography, or NMR methods. This work presents two robust and sensitive assays based on photometry and fluorimetry that allow decarboxylation reactions to be followed with high sensitivity while avoiding product extraction and long analysis times. Optimized assay procedures were used to measure BsPAD activity in cell lysates and to determine the kinetic constants (KM and Vmax ) of the purified enzyme for p-coumaric-, caffeic- and ferulic acid. Substrate inhibition was shown for caffeic acid.
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Affiliation(s)
- Henrik Terholsen
- Institute of Biochemistry Department of Biotechnology and Enzyme Catalysis, University of Greifswald, Felix-Hausdorff-Straße 4, 17487, Greifswald, Germany
| | - Kamela Myrtollari
- Institute of Molecular Biotechnology, Graz University of Technology, Petersgasse 14, 8010, Graz, Austria
- Henkel AG & Co. KGaA, Adhesive Research, Henkelstraße 67, 40191, Düsseldorf, Germany
| | - Mirna Larva
- Institute of Molecular Biotechnology, Graz University of Technology, Petersgasse 14, 8010, Graz, Austria
| | - Christina Möller
- Institute of Biochemistry Department of Biotechnology and Enzyme Catalysis, University of Greifswald, Felix-Hausdorff-Straße 4, 17487, Greifswald, Germany
| | - Andreas Taden
- Henkel AG & Co. KGaA, Adhesive Research, Henkelstraße 67, 40191, Düsseldorf, Germany
| | - Robert Kourist
- Institute of Molecular Biotechnology, Graz University of Technology, Petersgasse 14, 8010, Graz, Austria
- acib - Austrian Centre of Industrial Biotechnology, Petersgasse 14, 8010, Graz, Austria
- BioTechMed-Graz, Mozartgasse 12/II, 8010, Graz, Austria
| | - Uwe T Bornscheuer
- Institute of Biochemistry Department of Biotechnology and Enzyme Catalysis, University of Greifswald, Felix-Hausdorff-Straße 4, 17487, Greifswald, Germany
| | - Daniel Kracher
- Institute of Molecular Biotechnology, Graz University of Technology, Petersgasse 14, 8010, Graz, Austria
- BioTechMed-Graz, Mozartgasse 12/II, 8010, Graz, Austria
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7
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Kaźmierczak T, Bonarska-Kujawa D, Męczarska K, Cyboran-Mikołajczyk S, Oszmiański J, Kapusta I. Analysis of the Polyphenolic Composition of Vaccinium L. Extracts and Their Protective Effect on Red Blood Cell Membranes. Membranes (Basel) 2023; 13:589. [PMID: 37367793 DOI: 10.3390/membranes13060589] [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] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/03/2023] [Accepted: 06/06/2023] [Indexed: 06/28/2023]
Abstract
The blueberry fruit of the genus Vaccinium, including high blueberry, low blueberry, and wild bilberry, is consumed for its flavor and medicinal properties. The purpose of the experiments was to investigate the protective effect and mechanism of the interaction of blueberry fruit polyphenol extracts with the erythrocytes and their membranes. The content of polyphenolic compounds in the extracts was determined using the chromatographic UPLC-ESI-MS method. The effects of the extracts on red blood cell shape changes, hemolysis and osmotic resistance were examined. Changes in the order of packing and fluidity of the erythrocyte membrane and the lipid membrane model caused by the extracts were identified using fluorimetric methods. Erythrocyte membrane oxidation was induced by two agents: AAPH compound and UVC radiation. The results show that the tested extracts are a rich source of low molecular weight polyphenols that bind to the polar groups of the erythrocyte membrane, changing the properties of its hydrophilic area. However, they practically do not penetrate the hydrophobic part of the membrane and do not damage its structure. Research results suggest that the components of the extracts can defend the organism against oxidative stress if they are delivered to the organism in the form of dietary supplements.
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Affiliation(s)
- Teresa Kaźmierczak
- Department of Biotechnology, University of Wrocław, Joliot-Curie 14a, 50-383 Wrocław, Poland
| | - Dorota Bonarska-Kujawa
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - Katarzyna Męczarska
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - Sylwia Cyboran-Mikołajczyk
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - Jan Oszmiański
- Department of Fruit, Vegetable and Plant Nutraceutical Technology, Wrocław University of Environmental and Life Sciences, Chełmońskiego 37, 51-630 Wrocław, Poland
| | - Ireneusz Kapusta
- Institute of Food Technology and Nutrition, University of Rzeszów, Zelwerowicza 4, 35-601 Rzeszów, Poland
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Boytsov D, Brescia S, Chaves G, Koefler S, Hannesschlaeger C, Siligan C, Goessweiner-Mohr N, Musset B, Pohl P. Trapped Pore Waters in the Open Proton Channel H V 1. Small 2023; 19:e2205968. [PMID: 36683221 DOI: 10.1002/smll.202205968] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 12/13/2022] [Indexed: 06/17/2023]
Abstract
The voltage-gated proton channel, HV 1, is crucial for innate immune responses. According to alternative hypotheses, protons either hop on top of an uninterrupted water wire or bypass titratable amino acids, interrupting the water wire halfway across the membrane. To distinguish between both hypotheses, the water mobility for the putative case of an uninterrupted wire is estimated. The predicted single-channel water permeability 2.3 × 10-12 cm3 s-1 reflects the permeability-governing number of hydrogen bonds between water molecules in single-file configuration and pore residues. However, the measured unitary water permeability does not confirm the predicted value. Osmotic deflation of reconstituted lipid vesicles reveals negligible water permeability of the HV 1 wild-type channel and the D174A mutant open at 0 mV. The conductance of 1400 H+ s-1 per wild-type channel agrees with the calculated diffusion limit for a ≈2 Å capture radius for protons. Removal of a charged amino acid (D174) at the pore mouth decreases H+ conductance by reducing the capture radius. At least one intervening amino acid contributes to H+ conductance while interrupting the water wire across the membrane.
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Affiliation(s)
- Danila Boytsov
- Institute of Biophysics, Johannes Kepler University, 4020 Linz, 40, Gruberstr, Austria
| | - Stefania Brescia
- Institute of Biophysics, Johannes Kepler University, 4020 Linz, 40, Gruberstr, Austria
| | - Gustavo Chaves
- Institute of Physiology, Pathophysiology and Biophysics, CPPB, Paracelsus Medical University, 90419, Nuremberg, Germany
| | - Sabina Koefler
- Institute of Biophysics, Johannes Kepler University, 4020 Linz, 40, Gruberstr, Austria
| | | | - Christine Siligan
- Institute of Biophysics, Johannes Kepler University, 4020 Linz, 40, Gruberstr, Austria
| | | | - Boris Musset
- Institute of Physiology, Pathophysiology and Biophysics, CPPB, Paracelsus Medical University, 90419, Nuremberg, Germany
| | - Peter Pohl
- Institute of Biophysics, Johannes Kepler University, 4020 Linz, 40, Gruberstr, Austria
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Barzallo D, Benavides J, Cerdà V, Palacio E. Multifunctional Portable System Based on Digital Images for In-Situ Detecting of Environmental and Food Samples. Molecules 2023; 28:molecules28062465. [PMID: 36985437 PMCID: PMC10051621 DOI: 10.3390/molecules28062465] [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: 01/29/2023] [Revised: 02/21/2023] [Accepted: 02/28/2023] [Indexed: 03/30/2023] Open
Abstract
The development of a portable device created by 3D printing for colorimetric and fluorometric measurements is an efficient tool for analytical applications in situ or in the laboratory presenting a wide field of applications in the environmental and food field. This device uses a light-emitting diode (LED) as radiation source and a webcam as a detector. Digital images obtained by the interaction between the radiation source and the sample were analyzed using a programming language developed in Matlab (Mathworks Inc., Natick, MA, USA), which builds the calibration curves in real-time using the RGB colour model. In addition, the entire system is connected to a notebook which serves as an LED and detector power supply without the need for any additional power source. The proposed device was used for the determination in situ of norfloxacin, allura red, and quinine in water and beverages samples, respectively. For the validation of the developed system, the results obtained were compared with a conventional spectrophotometer and spectrofluorometer respectively with a t-test at a 95% confidence level, which provides satisfactory precision and accuracy values.
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Affiliation(s)
- Diego Barzallo
- Environmental Analytical Chemistry Group, Department of Chemistry, University of the Balearic Islands, 07122 Palma, Spain
| | - Jorge Benavides
- Department of Electrical and Electronic Engineering, Universidad del Valle, Cali 760042, Colombia
| | | | - Edwin Palacio
- Environmental Analytical Chemistry Group, Department of Chemistry, University of the Balearic Islands, 07122 Palma, Spain
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Weichselbaum E, Galimzyanov T, Batishchev OV, Akimov SA, Pohl P. Proton Migration on Top of Charged Membranes. Biomolecules 2023; 13:biom13020352. [PMID: 36830721 PMCID: PMC9953355 DOI: 10.3390/biom13020352] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/23/2023] [Accepted: 02/07/2023] [Indexed: 02/15/2023] Open
Abstract
Proton relay between interfacial water molecules allows rapid two-dimensional diffusion. An energy barrier, ΔGr‡, opposes proton-surface-to-bulk release. The ΔGr‡-regulating mechanism thus far has remained unknown. Here, we explored the effect interfacial charges have on ΔGr‡'s enthalpic and entropic constituents, ΔGH‡ and ΔGS‡, respectively. A light flash illuminating a micrometer-sized membrane patch of a free-standing planar lipid bilayer released protons from an adsorbed hydrophobic caged compound. A lipid-anchored pH-sensitive dye reported protons' arrival at a distant membrane patch. Introducing net-negative charges to the bilayer doubled ΔGH‡, while positive net charges decreased ΔGH‡. The accompanying variations in ΔGS‡ compensated for the ΔGH‡ modifications so that ΔGr‡ was nearly constant. The increase in the entropic component of the barrier is most likely due to the lower number and strength of hydrogen bonds known to be formed by positively charged residues as compared to negatively charged moieties. The resulting high ΔGr‡ ensured interfacial proton diffusion for all measured membranes. The observation indicates that the variation in membrane surface charge alone is a poor regulator of proton traffic along the membrane surface.
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Affiliation(s)
- Ewald Weichselbaum
- Institute of Biophysics, Johannes Kepler University Linz, 4040 Linz, Austria
| | - Timur Galimzyanov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russia
- Department of Theoretical Physics and Quantum Technologies, National University of Science and Technology “MISiS”, Moscow 119991, Russia
| | - Oleg V. Batishchev
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russia
| | - Sergey A. Akimov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russia
- Department of Theoretical Physics and Quantum Technologies, National University of Science and Technology “MISiS”, Moscow 119991, Russia
| | - Peter Pohl
- Institute of Biophysics, Johannes Kepler University Linz, 4040 Linz, Austria
- Correspondence:
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Di Nonno S, Ulber R. Portuino-A Novel Portable Low-Cost Arduino-Based Photo- and Fluorimeter. Sensors (Basel) 2022; 22:7916. [PMID: 36298268 PMCID: PMC9609715 DOI: 10.3390/s22207916] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 10/13/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
A novel portable low-cost Arduino-controlled photo- and fluorimeter for on-site measurements has been developed. The device uses LEDs as a light source and a phototransistor as a light sensor. The circuit is based on the discharge of a capacitor with the photocurrent from the phototransistor. Validation experiments for absorbance measurements were performed by measuring protein concentration using the Bradford method and measuring phosphate ions in water using a commercial test kit. The emission light of the excited fluorescent dyes rhodamine 6G and calcofluor white was measured to validate the usability of the device as a fluorescence photometer. In all validation experiments, similar correlation coefficients and limit of detection could be achieved with the portable photo- and fluorimeter and a laboratory spectrometer and fluorimeter. Real sample analysis was performed, measuring phosphate concentration in freshwater and concentration of green fluorescent protein, extracted from Escherichia coli.
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Affiliation(s)
- Sarah Di Nonno
- Correspondence: (S.D.N.); (R.U.); Tel.: +49-631-205-5441 (S.D.N.); +49-631-205-4043 (R.U.)
| | - Roland Ulber
- Correspondence: (S.D.N.); (R.U.); Tel.: +49-631-205-5441 (S.D.N.); +49-631-205-4043 (R.U.)
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12
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Gamal M, Ali HM, El-Shaheny R, Naguib IA, Alsalahat I, El-Maghrabey M. Facile Conversion of the Quinone-Semicarbazone Chromophore of Naftazone into a Fluorescent Quinol-Semicarbazide: Kinetic Study and Analysis of Naftazone in Pharmaceuticals and Human Serum. Sensors (Basel) 2022; 22:6205. [PMID: 36015966 PMCID: PMC9415041 DOI: 10.3390/s22166205] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/12/2022] [Accepted: 08/16/2022] [Indexed: 06/15/2023]
Abstract
Naftazone is a quinone-semi carbazone drug that possesses a strong orange color, and hence it was usually analyzed colorimetrically or by HPLC-UV. However, these methods are not sensitive enough to determine naftazone in biological samples. Naftazone lacks intrinsic fluorescence and does not possess easily derivatizable functional groups. In this contribution, we introduced the first spectrofluorimetric method for naftazone assay through reduction-elicited fluorogenic derivatization through the reduction of its quinone-semicarbazone moiety to the corresponding quinol-semicarbazide derivative by potassium borohydride as a reduction probe. The solvent-dependent fluorescence of the reaction product was studied in various protic and aprotic solvents. Eventually, the fluorescence of the reduced naftazone was measured in 2-propanol at λemission of 350 nm after excitation at λecxitation of 295 nm. The relative fluorescence intensity was linearly correlated to the drug concentration (r = 0.9995) from 10.0 to 500 ng/mL with high sensitivity, where the lower detection limit was 2.9 ng/mL. Hence, the method was effectively applied for naftazone tablets quality control with a mean %recovery of 100.3 ± 1.5, and the results agreed with those of the comparison HPLC-UV method. Furthermore, a new salting-out assisted liquid-liquid extraction (SALLE) method was established for naftazone extraction from human serum, followed by its determination using the developed reduction-based fluorogenic method. The developed SALLE method showed excellent recovery for naftazone from human serum (92.3-106.5%) with good precision (RSD ≤ 6.8%). Additionally, the reaction of naftazone with potassium borohydride was kinetically monitored, and it was found to follow pseudo-first-order kinetics with an activation energy of 43.8 kcal/mol. The developed method's greenness was approved using three green analytical chemistry metrics.
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Affiliation(s)
- Mohammed Gamal
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jouf University, P.O. Box 2014, Sakaka 72388, Aljouf, Saudi Arabia or
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmed Hegazy St., Beni-Suef 62574, Egypt
| | - Hazim M. Ali
- Department of Chemistry, College of Science, Jouf University, P.O. Box 2014, Sakaka 72388, Aljouf, Saudi Arabia
| | - Rania El-Shaheny
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Ibrahim A. Naguib
- Department of Pharmaceutical Chemistry, College of Pharmacy, Taif University, P.O. Box 11099, Taif 21944, Mecca, Saudi Arabia
| | - Izzeddin Alsalahat
- UK Dementia Research Institute Cardiff, School of Medicine, Cardiff University, Cardiff CF24 1TP, UK
| | - Mahmoud El-Maghrabey
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
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Petters I, Modrušan M, Vidović N, Crnolatac I, Cindro N, Piantanida I, Speranza G, Horvat G, Tomišić V. Anion-Sensing Properties of Cyclopentaphenylalanine. Molecules 2022; 27:molecules27123918. [PMID: 35745042 PMCID: PMC9228215 DOI: 10.3390/molecules27123918] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/15/2022] [Accepted: 06/16/2022] [Indexed: 11/16/2022]
Abstract
Cyclic pentaphenylalanine was studied as an efficient anion sensor for halides, thiocyanate and oxoanions in acetonitrile and methanol. Stability constants of the corresponding complexes were determined by means of fluorimetric, spectrophotometric, 1H NMR, and microcalorimetric titrations. A detailed structural overview of receptor–anion complexes was obtained by classical molecular dynamics (MD) simulations. The results of 1H NMR and MD studies indicated that the bound anions were coordinated by the amide groups of cyclopeptide, as expected. Circular dichroism (CD) titrations were also carried out in acetonitrile. To the best of our knowledge, this is the first example of the detection of anion binding by cyclopeptide using CD spectroscopy. The CD spectra were calculated from the structures obtained by MD simulations and were qualitatively in agreement with the experimental data. The stoichiometry of almost all complexes was 1:1 (receptor:anion), except for dihydrogen phosphate where the binding of dihydrogen phosphate dimer was observed in acetonitrile. The affinity of the cyclopeptide receptor was correlated with the structure of anion coordination sphere, as well as with the solvation properties of the examined solvents.
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Affiliation(s)
- Ivan Petters
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (I.P.); (M.M.); (N.C.)
| | - Matija Modrušan
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (I.P.); (M.M.); (N.C.)
| | - Nikolina Vidović
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi, 19, 20133 Milan, Italy; (N.V.); (G.S.)
- Institute of Agriculture and Tourism, Department of Agriculture and Nutrition, Karla Huguesa 8, 52440 Poreč, Croatia
| | - Ivo Crnolatac
- Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia; (I.C.); (I.P.)
| | - Nikola Cindro
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (I.P.); (M.M.); (N.C.)
| | - Ivo Piantanida
- Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia; (I.C.); (I.P.)
| | - Giovanna Speranza
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi, 19, 20133 Milan, Italy; (N.V.); (G.S.)
| | - Gordan Horvat
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (I.P.); (M.M.); (N.C.)
- Correspondence: (G.H.); (V.T.)
| | - Vladislav Tomišić
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (I.P.); (M.M.); (N.C.)
- Correspondence: (G.H.); (V.T.)
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14
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Luiz MT, Dutra JAP, Di Filippo LD, Junior AGT, Tofani LB, Marchetti JM, Chorilli M. Epirubicin: Biological Properties, Analytical Methods, and Drug Delivery Nanosystems. Crit Rev Anal Chem 2021; 53:1080-1093. [PMID: 34818953 DOI: 10.1080/10408347.2021.2007469] [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] [Indexed: 07/21/2023]
Abstract
Epirubicin (EPI) is a chemotherapeutic agent belonging to the anthracycline drug class indicated for treating several tumors. It acts by suppressing the DNA and RNA synthesis by intercalating between their base pair. However, several side effects are associated with this therapy, including cardiotoxicity and myelosuppression. Therefore, EPI delivery in nanosystems has been an interesting strategy to overcome these limitations and improve the safety and efficacy of EPI. Thus, analytical methods have been used to understand and characterize these nanosystems, including spectrophotometric, spectrofluorimetric, and chromatography. Spectrophotometric and spectrofluorimetric methods have been used to quantify EPI in less complex matrices due to their efficiency, low cost, and green chemistry character. By contrast, high-performance liquid chromatography is a suitable method for detecting EPI in more complex matrices (e.g., plasm and urine) owing to its high sensitivity. This review summarizes physicochemical and pharmacokinetic properties of EPI, its application in drug delivery nanosystems, and the analytical methods employed in its quantification in different matrices, including blood, plasm, urine, and drug delivery nanosystems.
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Affiliation(s)
- Marcela Tavares Luiz
- School of Pharmaceutical Science of Ribeirao Preto, University of São Paulo (USP), Ribeirao Preto, São Paulo, Brazil
| | | | | | | | - Larissa Bueno Tofani
- School of Pharmaceutical Science of Ribeirao Preto, University of São Paulo (USP), Ribeirao Preto, São Paulo, Brazil
| | - Juliana Maldonado Marchetti
- School of Pharmaceutical Science of Ribeirao Preto, University of São Paulo (USP), Ribeirao Preto, São Paulo, Brazil
| | - Marlus Chorilli
- School of Pharmaceutical Science of São Paulo State University (UNESP), Araraquara, São Paulo, Brazil
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15
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Abdel-Aziz H, Tolba MM, El-Enany N, Aly FA, Fathy ME. Green and sensitive spectrofluorimetric method for the determination of two cephalosporins in dosage forms. R Soc Open Sci 2021; 8:210329. [PMID: 34386250 PMCID: PMC8334852 DOI: 10.1098/rsos.210329] [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] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Using two green and sensitive spectrofluorimetric methods, we quantified two cephalosporins, cefepime (CFM) and cefazolin (CFZ), in raw and pharmaceutical formulations. The first method is based on the reaction between CFM and fluorescamine (borate buffer, pH 8), which yields a highly fluorescent product. After excitation at 384 nm, the fluorescent product emits light at 484 nm. At concentration ranges from 12.0 to 120.0 ng ml-1, the relative fluorescence intensity/concentration curve was linear with a limit of quantification (LOQ) of 2.46 ng ml-1. The second method relied on measuring the CFZ quenching action on acriflavine fluorescence through formation of an ion-associate complex using Britton-Robinson buffer at pH 8. We measured acriflavine fluorescence at 505 nm after excitation at 265 nm. The decrease in acriflavine fluorescence intensity was CFZ concentration-dependent. Using this method, we quantified CFZ in concentrations ranging from 1 to 10 µg ml-1 with a LOQ of 0.48 µg ml-1. We studied and optimized the factors influencing reaction product formation. Moreover, we adapted our methods to the investigation of the mentioned drugs in raw and pharmaceutical formulations with greatly satisfying results. We statistically validated our methods according to International Council on Harmonisation Guidelines. The obtained results were consistent with those obtained with the official high-performance liquid chromatography methods.
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Affiliation(s)
- Heba Abdel-Aziz
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516 Mansoura, Egypt
| | - M. M. Tolba
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516 Mansoura, Egypt
| | - N. El-Enany
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516 Mansoura, Egypt
| | - F. A. Aly
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516 Mansoura, Egypt
| | - M. E. Fathy
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516 Mansoura, Egypt
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de Oliveira Fernandes G, Milazzotto MP, Fidelis AAG, Kawamoto TS, de Oliveira Leme L, de Lima CB, Franco MM, Dode MAN. Biochemical markers for pregnancy in the spent culture medium of in vitro produced bovine embryos†. Biol Reprod 2021; 105:481-490. [PMID: 33982057 DOI: 10.1093/biolre/ioab095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 10/15/2020] [Revised: 04/28/2021] [Accepted: 05/05/2021] [Indexed: 12/29/2022] Open
Abstract
The present study aimed to identify biomarkers to assess the quality of in vitro produced (IVP) bovine embryos in the culture media. IVP embryos on Day (D) 5 of development were transferred to individual drops, where they were maintained for the last 48 h of culture. Thereafter, the medium was collected and the embryos were transferred to the recipients. After pregnancy diagnosis, the media were grouped into the pregnant and nonpregnant groups. The metabolic profiles of the media were analyzed via electrospray ionization mass spectrometry, and the concentrations of pyruvate, lactate, and glutamate were assessed using fluorimetry. The spectrometric profile revealed that the media from embryos from the pregnant group presented a higher signal intensity compared to that of the nonpregnant group; the ions 156.13 Da [M + H]+, 444.33 Da [M + H]+, and 305.97 Da [M + H]+ were identified as biomarkers. Spent culture medium from expanded blastocysts (Bx) that established pregnancy had a greater concentration of pyruvate (p = 0.0174) and lesser concentration of lactate (p = 0.042) than spent culture medium from Bx that did not establish pregnancy. Moreover, pyruvate in the culture media of Bx can predict pregnancy with 90.9% sensitivity and 75% specificity. In conclusion, we identified markers in the culture media that helped in assessing the most viable IVP embryos with a greater potential to establish pregnancy.
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Affiliation(s)
- Gabriela de Oliveira Fernandes
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília, DF, Brazil.,Laboratory of Animal Reproduction, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil
| | | | | | - Taynan Stonoga Kawamoto
- Laboratory of Animal Reproduction, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil
| | - Ligiane de Oliveira Leme
- Laboratory of Animal Reproduction, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil.,UFES, Universidade Federal do Espírito Santo, Alegre, ES, Brazil
| | - Camila Bruna de Lima
- Center of Natural and Human Sciences, Universidade Federal do ABC, Santo André, São Paulo, Brazil.,Centre de Recherche en Reproduction, Développement et Santé Intergénérationnelle. Département des Sciences Animales, Université Laval, Québec, Canada
| | - Maurício Machaim Franco
- Laboratory of Animal Reproduction, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil
| | - Margot Alves Nunes Dode
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília, DF, Brazil.,Laboratory of Animal Reproduction, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil
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17
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Kubaski F, Sousa I, Amorim T, Pereira D, Trometer J, Souza A, Ranieri E, Polo G, Burlina A, Brusius-Facchin AC, Netto ABO, Tomatsu S, Giugliani R. Neonatal Screening for MPS Disorders in Latin America: A Survey of Pilot Initiatives. Int J Neonatal Screen 2020; 6:ijns6040090. [PMID: 33203019 PMCID: PMC7711587 DOI: 10.3390/ijns6040090] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/07/2020] [Accepted: 11/10/2020] [Indexed: 11/30/2022] Open
Abstract
Newborn screening enables the diagnosis of treatable disorders at the early stages, and because of its countless benefits, conditions have been continuously added to screening panels, allowing early intervention, aiming for the prevention of irreversible manifestations and even premature death. Mucopolysaccharidoses (MPS) are lysosomal storage disorders than can benefit from an early diagnosis, and thus are being recommended for newborn screening. They are multisystemic progressive disorders, with treatment options already available for several MPS types. MPS I was the first MPS disorder enrolled in the newborn screening (NBS) panel in the USA and a few other countries, and other MPS types are expected to be added. Very few studies about NBS for MPS in Latin America have been published so far. In this review, we report the results of pilot studies performed in Mexico and Brazil using different methodologies: tandem mass spectrometry, molecular analysis, digital microfluidics, and fluorimetry. These experiences are important to report and discuss, as we expect to have several MPS types added to NBS panels shortly. This addition will enable timely diagnosis of MPS, avoiding the long diagnostic odyssey that is part of the current natural history of this group of diseases, and leading to a better outcome for the affected patients.
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Affiliation(s)
- Francyne Kubaski
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90040-060, Brazil;
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre 90035-903, Brazil; (A.C.B.-F.); (A.B.O.N.)
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Porto Alegre 90035-003, Brazil
- Correspondence: ; Tel.: +55-51-3359-8011
| | - Inês Sousa
- Associação de Pais e Amigos dos Excepcionais (APAE) Salvador, Salvador 41830-141, Brazil; (I.S.); (T.A.)
| | - Tatiana Amorim
- Associação de Pais e Amigos dos Excepcionais (APAE) Salvador, Salvador 41830-141, Brazil; (I.S.); (T.A.)
| | - Danilo Pereira
- Department of Research and Innovation, Innovatox, São Paulo 06455-020, Brazil;
| | | | | | - Enzo Ranieri
- SA Pathology, Women’s and Children’s Hospital, Adelaide, SA 5006, Australia;
| | - Giulia Polo
- Division of Inherited Metabolic Diseases, Department of Diagnostic Services, University Hospital of Padua, 35129 Padua, Italy; (G.P.); (A.B.)
| | - Alberto Burlina
- Division of Inherited Metabolic Diseases, Department of Diagnostic Services, University Hospital of Padua, 35129 Padua, Italy; (G.P.); (A.B.)
| | - Ana Carolina Brusius-Facchin
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre 90035-903, Brazil; (A.C.B.-F.); (A.B.O.N.)
| | - Alice Brinckmann Oliveira Netto
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre 90035-903, Brazil; (A.C.B.-F.); (A.B.O.N.)
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Porto Alegre 90035-003, Brazil
- Department of Biological Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90040-060, Brazil
| | - Shunji Tomatsu
- Department of Orthopedics and Biomedical, Nemours/Alfred I. duPont Hospital for Children, Wilmington, DE 19803, USA;
| | - Roberto Giugliani
- Postgraduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90040-060, Brazil;
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre 90035-903, Brazil; (A.C.B.-F.); (A.B.O.N.)
- Instituto Nacional de Genética Médica Populacional (iNaGeMP), Porto Alegre 90035-003, Brazil
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18
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Tsiasioti A, Andreou A, Tzanavaras PD. Selective reaction of homocysteine with o-phthalaldehyde under flow conditions in highly alkaline medium: fluorimetric determination using zone fluidics. LUMINESCENCE 2020; 35:1402-1407. [PMID: 32592606 DOI: 10.1002/bio.3904] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 06/16/2020] [Accepted: 06/25/2020] [Indexed: 11/07/2022]
Abstract
In the present study we report the reaction between homocysteine and o-phthalaldehyde under flow conditions. Homocysteine reacts on-line with the derivatization reagent in a strong alkaline medium and in the absence of nucleophilic reagents to yield a fluorescent derivative (λex /λem = 370/480 nm). The reaction variables were investigated using the concept of zone fluidics. Selectivity factors against other compounds were calculated at 10-fold excess. The findings formed the basis of an automated proposed method that was found to be linear in the range 0.1-1.5 μmol L-1 , with a limit of detection of 20 nmol L-1 and relative standard deviation < 0.5% (within-day) and 3.2% (between-day). The method proved to be rapid, offering a practical sampling rate of 24 h-1 and accurate following application to an artificial urine matrix with minimum dilution.
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Affiliation(s)
- Apostolia Tsiasioti
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, Greece
| | - Aikaterini Andreou
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, Greece
| | - Paraskevas D Tzanavaras
- Laboratory of Analytical Chemistry, School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, Greece
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19
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Alevridis A, Tsiasioti A, Zacharis CK, Tzanavaras PD. Fluorimetric Method for the Determination of Histidine in Random Human Urine Based on Zone Fluidics. Molecules 2020; 25:E1665. [PMID: 32260350 DOI: 10.3390/molecules25071665] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 03/31/2020] [Accepted: 04/02/2020] [Indexed: 01/08/2023] Open
Abstract
In the present study, the determination of histidine (HIS) by an on-line flow method based on the concept of zone fluidics is reported. HIS reacts fast with o-phthalaldehyde at a mildly basic medium (pH 7.5) and in the absence of additional nucleophilic compounds to yield a highly fluorescent derivative (λex/λem = 360/440 nm). The flow procedure was optimized and validated, paying special attention to its selectivity and sensitivity. The LOD was 31 nmol·L−1, while the within-day and day-to-day precisions were better than 1.0% and 5.0%, respectively (n = 6). Random urine samples from adult volunteers (n = 7) were successfully analyzed without matrix effect (<1%). Endogenous HIS content ranged between 116 and 1527 μmol·L−1 with percentage recoveries in the range of 87.6%–95.4%.
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Yang Q, Farooq U, Chen W, Ullah MW, Wang S. Fluorimetric Detection of Single Pathogenic Bacterium in Milk and Sewage Water Using pH-Sensitive Fluorescent Carbon Dots and MALDI-TOF MS. Microorganisms 2019; 8:E53. [PMID: 31888104 PMCID: PMC7022441 DOI: 10.3390/microorganisms8010053] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 12/23/2019] [Accepted: 12/23/2019] [Indexed: 12/20/2022] Open
Abstract
The current study is focused on the application of water-soluble, fluorescent, and pH-sensitive carbon dots (CDs) as a nanoprobe for sensitive detection of pathogenic bacteria in milk and sewage water. The CDs were facilely synthesized through the controlled carbonization of sucrose using sulfuric acid and characterized through XRD, FTIR, TEM, UV-Vis Spectroscopy, and fluorescent analysis. The as-synthesized CDs were highly water-soluble, stable, and pH-sensitive fluorescent nanomaterials. The pH-related fluorescence study showed that the ratio of fluorescence intensity (Log[IF410/IF350]) changed linearly in the pH range between 4.9 and 6.9 in the Britton-Robison buffer. By determining the pH variation of the growth medium caused by the released acidic metabolites, the CDs-based ratiometric nanoprobe and MALDI-TOF mass spectrometry (MS) were used for the detection and identification of Escherichia coli O157:H7, respectively. The practical applicability of the pH-sensitive fluorescent CDs-based ratiometric nanoprobe was evaluated to detect Escherichia coli O157:H7 in real samples, i.e., milk and sewage water using agar count plate method with a limit of detection (LOD) up to 1 colony-forming unit per mL (CFU/mL).
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Affiliation(s)
- Qiaoli Yang
- Advanced Biomaterials & Tissue Engineering Centre, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; (Q.Y.); (U.F.)
| | - Umer Farooq
- Advanced Biomaterials & Tissue Engineering Centre, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; (Q.Y.); (U.F.)
| | - Wei Chen
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China (M.W.U.)
| | - Muhammad Wajid Ullah
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China (M.W.U.)
| | - Shenqi Wang
- Advanced Biomaterials & Tissue Engineering Centre, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; (Q.Y.); (U.F.)
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21
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Mori T, Katayama Y. Signal amplification in flow cytometry for cell surface antigen analysis. J Biochem 2019; 166:205-212. [PMID: 31251348 DOI: 10.1093/jb/mvz052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 05/15/2019] [Accepted: 06/25/2019] [Indexed: 01/12/2023] Open
Abstract
Signal enhancing systems have been introduced to enable detection of cell surface antigens by flow cytometry. Cell surface antigens are important targets that describe the function and lineage of cells. Although flow cytometry is an effective tool for analysing cell surface antigens, this technique has poor sensitivity, which prohibits the detection of many important antigens on cell membranes. Thus, signal amplification is essential for developing practical tools for evaluating cell surface antigens by flow cytometry. Using a bright fluorophore or fluorescent polymer incorporated into antibodies is a straightforward strategy to improve flow cytometry sensitivity but may affect the functional characteristics of the labelled antibody. In contrast, enzymatic signal amplification is a more practical and efficient strategy to improve sensitivity that should not affect antibody activity. Although enzymatic signal amplification still has a number of drawbacks, this approach is a promising strategy to analyse cell surface antigens.
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Affiliation(s)
- Takeshi Mori
- Faculty of Engineering, Department of Chemistry and Biochemistry, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, Japan
| | - Yoshiki Katayama
- Faculty of Engineering, Department of Chemistry and Biochemistry, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, Japan
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Papp F, Lomash S, Szilagyi O, Babikow E, Smith J, Chang TH, Bahamonde MI, Toombes GES, Swartz KJ. TMEM266 is a functional voltage sensor regulated by extracellular Zn 2. eLife 2019; 8:42372. [PMID: 30810529 PMCID: PMC6392501 DOI: 10.7554/elife.42372] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [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: 09/26/2018] [Accepted: 02/13/2019] [Indexed: 12/15/2022] Open
Abstract
Voltage-activated ion channels contain S1-S4 domains that sense membrane voltage and control opening of ion-selective pores, a mechanism that is crucial for electrical signaling. Related S1-S4 domains have been identified in voltage-sensitive phosphatases and voltage-activated proton channels, both of which lack associated pore domains. hTMEM266 is a protein of unknown function that is predicted to contain an S1-S4 domain, along with partially structured cytoplasmic termini. Here we show that hTMEM266 forms oligomers, undergoes both rapid (µs) and slow (ms) structural rearrangements in response to changes in voltage, and contains a Zn2+ binding site that can regulate the slow conformational transition. Our results demonstrate that the S1-S4 domain in hTMEM266 is a functional voltage sensor, motivating future studies to identify cellular processes that may be regulated by the protein. The ability of hTMEM266 to respond to voltage on the µs timescale may be advantageous for designing new genetically encoded voltage indicators.
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Affiliation(s)
- Ferenc Papp
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States.,MTA-DE-NAP B Ion Channel Structure-Function Research Group, Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Suvendu Lomash
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Orsolya Szilagyi
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Erika Babikow
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Jaime Smith
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Tsg-Hui Chang
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Maria Isabel Bahamonde
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Gilman Ewan Stephen Toombes
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
| | - Kenton Jon Swartz
- Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
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Ponti G, Maccaferri M, Micali S, Manfredini M, Milandri R, Bianchi G, Pellacani G, Kaleci S, Chester J, Conti A, Del Prete C, Tomasi A. Seminal Cell Free DNA Concentration Levels Discriminate Between Prostate Cancer and Benign Prostatic Hyperplasia. Anticancer Res 2018; 38:5121-5125. [PMID: 30194158 DOI: 10.21873/anticanres.12833] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 07/30/2018] [Revised: 08/16/2018] [Accepted: 08/19/2018] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM Seminal plasma cfDNA (scfDNA) was recently proposed as a novel PCa biomarker. Our aim was to evaluate whether scfDNA could discriminate PCa from benign prostate hyperplasia (BPH) patients. PATIENTS AND METHODS A cohort of 43 patients (18 and 25 pathology proven PCa and BPH patients), and 13 healthy age-matched control subjects were enrolled. scfDNA quantification was performed. Data were analyzed through ANOVA testing. RESULTS Average scfDNA concentrations were 1,407.83 ng/μl, 128.13 ng/μl and 78.09 ng/μl for PCa patients, BPH patients and healthy subjects, respectively. Statistical analysis showed a significant difference among the groups, allowing for distinction of patients with optimal accuracy. A cut-off level of 450 ng/μl scfDNA was identified for the differentiation of PCa and BPH patients. CONCLUSION scfDNA concentrations are significantly different between PCa patients and BPH patients. scfDNA is a promising biomarker with several applications in PCa diagnosis, screening programs and therapeutic monitoring.
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Affiliation(s)
- Giovanni Ponti
- Division of Clinical Pathology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Monia Maccaferri
- Division of Clinical Pathology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Salvatore Micali
- Division of Urology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Marco Manfredini
- Dermatology Unit, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Riccardo Milandri
- Division of Urology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Giampaolo Bianchi
- Division of Urology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Giovanni Pellacani
- Dermatology Unit, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Shaniko Kaleci
- Dermatology Unit, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Johanna Chester
- Dermatology Unit, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Andrea Conti
- Dermatology Unit, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Chiara Del Prete
- Division of Urology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
| | - Aldo Tomasi
- Division of Clinical Pathology, Department of Surgical, Medical, Dental and Morphological Sciences with Interest in Transplant, University of Modena and Reggio Emilia, Modena, Italy
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24
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Naeem A, Alam MT, Khan TA, Husain Q. A Biophysical and Computational Study of Concanavalin A Immobilized Zinc Oxide Nanoparticles. Protein Pept Lett 2018; 24:1096-1104. [PMID: 28933278 DOI: 10.2174/0929866524666170920114057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 11/19/2016] [Revised: 08/29/2017] [Accepted: 08/29/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND Con A, a lectin extract from jackbean Canavalia ensiformis is known for its agglutination activity. ZnO nanoparticles promote the faster electron transfer between the lectin immobilized and the target cells. Hence, Con A immobilized on ZnO nanoparticles will agglutinate cells more effectively than the native protein. OBJECTIVES Concanavalin A (Con A), a lectin was immobilized on the hexagonal zinc oxide (ZnO) nanoparticles to monitor its activity on RBCs and lymphocytes. METHODS The immobilization of Con A and zinc oxide nanoparticles has been studied by molecular docking, microscopic and genotoxicity assessment techniques. RESULTS Qualitative assessment using various techniques like atomic force microscopy, scanning electron microscopy and X-ray diffraction showed minor changes in morphology of Con A and ZnO nanoparticles. FT-IR spectroscopy confirmed the linking of Con A amino groups with ZnO nanoparticles. Con A immobilized nanoparticles in contrast to native lectin showed minor changes in hemagglutination activity as confirmed by pH dependence studies using fluorimetry. Con Aimmobilized nanoparticles retained the agglutination activity, this can be indicative of their potential application in detection of virus transformed and neoplastic cells. The Con A immobilized ZnO nanoparticles did not induce any significant but minor damage to whole cell DNA as revealed from comet assay or plasmid DNA. CONCLUSION Con A immobilized on ZnO nanoparticles showed minor changes in the structure of ZnO nanoparticles and in the conformational of native Con A. However, Con A immobilized ZnO nanoparticles interestingly, showed pH resistance and better hemagglutination activity as well as minor DNA damage to whole cell lymphocytes. Thus, this novel bioaffinity support has prospective clinical implications.
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Affiliation(s)
- Aabgeena Naeem
- Department of Biochemistry, Faculty of Life Sciences, AMU, Aligarh 202 002, India
| | - Md Tauqir Alam
- Department of Biochemistry, Faculty of Life Sciences, AMU, Aligarh 202 002, India
| | - Taqi Ahmad Khan
- Applied Biotechnology Department, Sur college of Applied Sciences, P.O. Box 484, Sur, 411, Oman
| | - Qayyum Husain
- Department of Biochemistry, Faculty of Life Sciences, AMU, Aligarh 202 002, India
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25
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Rimac H, Dufour C, Debeljak Ž, Zorc B, Bojić M. Warfarin and Flavonoids Do Not Share the Same Binding Region in Binding to the IIA Subdomain of Human Serum Albumin. Molecules 2017; 22:molecules22071153. [PMID: 28696372 PMCID: PMC6152318 DOI: 10.3390/molecules22071153] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [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: 06/11/2017] [Accepted: 07/07/2017] [Indexed: 01/16/2023] Open
Abstract
Human serum albumin (HSA) binds a variety of xenobiotics, including flavonoids and warfarin. The binding of another ligand to the IIA binding site on HSA can cause warfarin displacement and potentially the elevation of its free concentration in blood. Studies dealing with flavonoid-induced warfarin displacement from HSA provided controversial results: estimated risk of displacement ranged from none to serious. To resolve these controversies, in vitro study of simultaneous binding of warfarin and eight different flavonoid aglycons and glycosides to HSA was carried out by fluorescence spectroscopy as well as molecular docking. Results show that warfarin and flavonoids do not share the same binding region in binding to HSA. Interactions were only observed at high warfarin concentrations not attainable under recommended dosing regimes. Docking experiments show that flavonoid aglycons and glycosides do not bind at warfarin high affinity sites, but rather to different regions within the IIA HSA subdomain. Thus, the risk of clinically significant warfarin-flavonoid interaction in binding to HSA should be regarded as negligible.
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Affiliation(s)
- Hrvoje Rimac
- Department of Medicinal Chemistry, University of Zagreb, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, 10000 Zagreb, Croatia.
| | - Claire Dufour
- UMR408 SQPOV, Safety and Quality of Plant Products, INRA, Avignon University, 228 Route de l'Aérodrome, 84000 Avignon, France.
| | - Željko Debeljak
- Institute of Clinical Laboratory Diagnostics, Osijek University Hospital Center, Josipa Huttlera 4, 31000 Osijek, Croatia.
- Department of Pharmacology, School of Medicine, University of Osijek, Cara Hadrijana 10/E, 31000 Osijek, Croatia.
| | - Branka Zorc
- Department of Medicinal Chemistry, University of Zagreb, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, 10000 Zagreb, Croatia.
| | - Mirza Bojić
- Department of Medicinal Chemistry, University of Zagreb, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, 10000 Zagreb, Croatia.
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Schielen PCJI, Kemper EA, Gelb MH. Newborn Screening for Lysosomal Storage Diseases: A Concise Review of the Literature on Screening Methods, Therapeutic Possibilities and Regional Programs. Int J Neonatal Screen 2017; 3:6. [PMID: 28730181 PMCID: PMC5515486 DOI: 10.3390/ijns3020006] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Newborn screening for lysosomal storage diseases (LSDs) is increasingly being considered as an option. The development of analytical screening methods, of second-tier methods, and of therapeutic possibilities, are paving the way for routine screening for LSDs in the coming years. Here, we give a brief description of the current status quo, what screening methods are currently available or are in the pipeline, what is the current status of therapeutic possibilities for LSDs, what LSDs are the most obvious candidates for introduction in screening programs, and what LSDs are already part of regional or national pilot or routine screening programs worldwide.
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Affiliation(s)
- Peter C. J. I. Schielen
- Reference Laboratory for Neonatal Screening, Centre for Infectious Diseases Research, Diagnostics and Screening, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
- Correspondence: ; Tel.: +31-30-274-3534
| | - Evelien A. Kemper
- Department of Clinical Chemistry, IJsselland Hospital, 2906 ZC Capelle ad IJssel, The Netherlands
| | - Michael H. Gelb
- Departments of Chemistry and Biochemistry, University of Washington, Seattle, WD 98195, USA
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27
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Zawaneh AH, Khalil NN, Ibrahim SA, Al-Dafiri WN, Maher HM. Micelle-enhanced direct spectrofluorimetric method for the determination of linifanib: Application to stability studies. LUMINESCENCE 2017; 32:1162-1168. [PMID: 28378538 DOI: 10.1002/bio.3304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 11/22/2016] [Revised: 01/22/2017] [Accepted: 02/01/2017] [Indexed: 12/13/2022]
Abstract
A new simple stability-indicating spectrofluorimetric method has been developed and validated for the determination of the tyrosine kinase inhibitor, linifanib (LNF). The proposed method makes use of the native fluorescence characteristics of LNF in a micellar system. Compared with aqueous solutions, the fluorescence intensity of LNF was greatly enhanced upon the addition of Tween-80. The relative fluorescence intensity of LNF was measured in a diluting solvent composed of 2% Tween-80: phosphate buffer pH 8.0 (20: 80, v/v) using excitation and emission wavelengths of 290 and 450 nm, respectively. The proposed method was fully validated as per the ICH guidelines. The recorded fluorescence intensity of LNF was rectilinear over a concentration range of 0.3-2 μg/ml with a high correlation coefficient (r = 0.9990) and low limits of detection (0.091 μg/ml) and quantitation (0.275 μg/ml). The applicability of the method was extended to study the inherent stability of LNF under different stress degradation conditions including, alkaline, acidic, oxidative, photolytic and thermal degradation. Moreover, the method was utilized to study the kinetics of the alkaline and oxidative degradation of LNF. The pseudo-first order rate constants and half-lives were calculated.
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Affiliation(s)
- Afnan H Zawaneh
- Department of Pharmaceutical Chemistry, King Saud University, Riyadh, Saudi Arabia
| | - Nehal N Khalil
- Department of Pharmaceutical Chemistry, King Saud University, Riyadh, Saudi Arabia
| | - Sundus A Ibrahim
- Department of Pharmaceutical Chemistry, King Saud University, Riyadh, Saudi Arabia
| | - Wafaa N Al-Dafiri
- Department of Pharmaceutical Chemistry, King Saud University, Riyadh, Saudi Arabia
| | - Hadir M Maher
- Department of Pharmaceutical Chemistry, King Saud University, Riyadh, Saudi Arabia.,Department of Pharmaceutical Analytical Chemistry, University of Alexandria, Alexandria, Egypt
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28
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Supriya M, De T, Christopher R. Effect of temperature on lysosomal enzyme activity during preparation and storage of dried blood spots. J Clin Lab Anal 2017; 32. [PMID: 28345760 DOI: 10.1002/jcla.22220] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 11/09/2016] [Accepted: 02/25/2017] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND The use of dried blood spots (DBS) for the assay of lysosomal enzymes has facilitated the implementation of pilot studies for newborn screening for lysosomal storage disorders in various developed countries. The aim of the study was to determine the influence of ambient temperature during DBS preparation and storage on lysosomal enzyme activity in a developing, tropical country. METHODS Blood samples from 12 healthy subjects collected on a S&S 903 filter paper were dried and stored at different temperatures for different periods of time. Activities of five lysosomal enzymes (acid α-glucosidase, acid α-galactosidase, acid β-glucocerebrosidase, acid sphingomyelinase, and galactocerebrosidase) were determined by tandem mass spectrometric and fluorimetric (acid α-glucosidase and acid β-glucocerebrosidase only) assays. RESULTS The mean activities of all five enzymes decreased significantly when DBS was dried at temperatures above 24°C (P<.0001). DBS stored at 4°C, 24°C, 30°C, 37°C, and 45°C for 10 days and more, also showed significant reduction in activities of all five enzymes (P<.0001). CONCLUSION The results highlight the importance of maintaining the correct ambient temperature during DBS preparation and storage to avoid false positive results when screening for lysosomal storage disorders.
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Affiliation(s)
- Manjunath Supriya
- Department of Neurochemistry, National Institute of Mental Health and Neuro Sciences, Bangalore, India
| | - Tanima De
- Department of Neurochemistry, National Institute of Mental Health and Neuro Sciences, Bangalore, India
| | - Rita Christopher
- Department of Neurochemistry, National Institute of Mental Health and Neuro Sciences, Bangalore, India
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Mohan A, Neeroli Kizhakayil R. Graphene-Rhodamine Nanoprobe for Colorimetric and Fluorimetric Hg(2+) Ion Assay. ACS Appl Mater Interfaces 2016; 8:14125-14132. [PMID: 27195915 DOI: 10.1021/acsami.6b03904] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This article reveals the first ever prospective application of Graphene-Rhodamine array (GRH) as a colorimetric and fluorimetric sensor for Hg(2+) ions. The duality of Graphene to undergo π-π and dispersive interactions with Rhodamine as well as to act as a selective adsorbent for Hg(2+) is conceptualized in this study. These interactions lead to decrease in absorbance of the dye in the presence of graphene, which is restored when kept in contact with Hg(2+) ions. The feasibility of the mechanism has been proved using EDTA as the coordinating ligand. It is noteworthy that all the optical variations occurred in the visible scale of the electromagnetic spectrum. The GRH array exhibited higher sensitivity toward the target ion with a limit of detection of 2 ppb. A perfect linear variation of absorbance at 554 nm with Hg(2+) concentration was observed in 0-1000 nM range, enabling the use of the system as a quantitative sensor for the test ion. The commendable selectivity of the array toward Hg(2+) ion has been investigated by observing the optical response in the presence of other environmentally relevant metal ions. A reversible turn off and turn on INHIBIT logic gate has been proposed which extends the scope of the designed array for the development of automated chemical systems. The fluorescence resonance energy transfer (FRET) ability of graphene paves the backbone for the fluorimetric detection. Fluorimetric strategy yielded a much lower limit of detection of 380 ppt using this probe, which makes a significant advance in trace detection of Hg(2+) ions.
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Affiliation(s)
- Anju Mohan
- Department of Chemistry, University of Calicut , Kerala-673 635, India
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Işeri-Erten SÖ, Dikmen ZG, Ulusu NN. Comparison of Spectrophotometric and Fluorimetric Methods in Evaluation of Biotinidase Deficiency. J Med Biochem 2016; 35:123-129. [PMID: 28356871 PMCID: PMC5346788 DOI: 10.1515/jomb-2016-0004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 10/19/2015] [Accepted: 12/08/2015] [Indexed: 11/25/2022] Open
Abstract
Background Biotin, a water-soluble vitamin, is used as a co-factor by enzymes involved in carboxylation reactions. Biotinidase (BTD) catalyzes the recycling of biotin from endogenous and dietary sources. Biotinidase deficiency (BD) is an autosomal recessively inherited disorder of biotin recycling that is associated with neurologic and cutaneous consequences when untreated. The aim of the study was to compare the results of spectrophotometric and fluorimetric methods, as well as to evaluate the advantages and disadvantages of both methods in current research practices. Methods Study group was chosen among the BD suspected newborn, children and parents (n = 52) who applied to Hacettepe University Pediatric Metabolism Unit. Results BTD activity is stable for 2 hours at room temperature and at 4 °C, and for 4 months at –20 °C and –80 °C. Genetic and clinical results showed that 25% of the total number of patients had complete BD which was treated with 10 mg/day biotin, while 15.38% of the patients had partial BD, and they were prescribed biotin 5 mg/day. The area under the ROC curve was 0.960±0.25 and 0.927± 0.41 for the fluorimetric and spectrophotometric method, respectively. Fluorimetric method showed 100% sensitivity and 97% specificity, whereas spectrophotometric method showed 90.5% sensitivity and 93.7% specificity. Conclusions Fluorimetric method is superior to the spectrophotometric method due to higher sensitivity and specificity.
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Affiliation(s)
| | - Zeliha Günnur Dikmen
- Hacettepe University, Faculty of Medicine, Department of Biochemistry, Ankara, Turkey
| | - Nuriye Nuray Ulusu
- Koç University, School of Medicine, Department of Biochemistry, Istanbul, Turkey
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Kapil R, Dhawan S, Singh B. Development and validation of a spectrofluorimetric method for the estimation of rivastigmine in formulations. Indian J Pharm Sci 2011; 71:585-9. [PMID: 20502586 PMCID: PMC2866359 DOI: 10.4103/0250-474x.58179] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [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: 05/07/2009] [Revised: 07/29/2009] [Accepted: 10/03/2009] [Indexed: 11/04/2022] Open
Abstract
A rapid, sensitive, simple, and cost-effective spectrofluorimetric method was developed for the estimation of rivastigmine in bulk and pharmaceutical formulations. The relative fluorescence intensity of rivastigmine was measured in triple distilled water at an excitation wavelength of 220 nm and an emission wavelength of 289 nm. Linearity range was found to be 100 to 4000 ng/ml. The method was validated for various parameters as per the ICH guidelines and USP requirements. The detection and quantitation limits were found to be 20.5 and 62.1 ng/ml, respectively. The results demonstrate that the procedure is accurate, precise, and reproducible, while being simple and rapid too. The results were found to be in good agreement with the label claims.
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Affiliation(s)
- R Kapil
- University Institute of Pharmaceutical Sciences (UGC Centre of Advanced Studies) Panjab University, Chandigarh-160 014, India
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Vasantharaju SG, Prabu SL, Jacob A. Spectrofluorimetric method for determination of citalopram in bulk and pharmaceutical dosage forms. Indian J Pharm Sci 2011; 70:647-8. [PMID: 21394265 PMCID: PMC3038293 DOI: 10.4103/0250-474x.45407] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [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: 05/12/2007] [Revised: 02/29/2008] [Accepted: 10/05/2008] [Indexed: 11/18/2022] Open
Abstract
A simple accurate, sensitive reproducible spectrofluorimetric method was developed for the analysis of citalopram in pure and pharmaceutical dosage form. Citalopram showed strong native fluorescence in 0.05 M sulphuric acid having excitation at 239 nm and emission at 300 nm. All parameters like the effect of different solvents, pH, dilutions, reaction time, temperature and effect of excipients were thoroughly investigated. The calibration graph was linear in the range from 0.100 to 0.900 μg/ml. The proposed method was statistically validated and successfully applied for analysis of tablet dosage forms. The percentage recovery was found to be between 99.08% to 99.28%.
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Affiliation(s)
- S G Vasantharaju
- Dept of Pharmaceutical Quality Assurance, Manipal College of Pharmaceutical Sciences, Manipal-576 104, India
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Korotkova EI, Misini B, Dorozhko EV, Bukkel MV, Plotnikov EV, Linert W. Study of OH radicals in human serum blood of healthy individuals and those with pathological schizophrenia. Int J Mol Sci 2011; 12:401-10. [PMID: 21339994 PMCID: PMC3039960 DOI: 10.3390/ijms12010401] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [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: 11/19/2010] [Revised: 12/29/2010] [Accepted: 01/04/2011] [Indexed: 11/17/2022] Open
Abstract
The human body is constantly under attack from free radicals that occur as part of normal cell metabolism, and by exposure to environmental factors such as UV light, cigarette smoke, environmental pollutants and gamma radiation. The resulting "Reactive Oxygen Species" (ROS) circulate freely in the body with access to all organs and tissues, which can have serious repercussions throughout the body. The body possesses a number of mechanisms both to control the production of ROS and to cope with free radicals in order to limit or repair damage to tissues. Overproduction of ROS or insufficient defense mechanisms leads to a dangerous disbalance in the organism. Thereby several pathomechanisms implicated in over 100 human diseases, e.g., cardiovascular disease, cancer, diabetes mellitus, physiological disease, aging, etc., can be induced. Thus, a detailed investigation on the quantity of oxygen radicals, such as hydroxyl radicals (OH(•)) in human serum blood, and its possible correlation with antioxidant therapy effects, is highly topical. The subject of this study was the influence of schizophrenia on the amount of OH(•) in human serum blood. The radicals were detected by fluorimetry, using terephthalic acid as a chemical trap. For all experiments the serum blood of healthy people was used as a control group.
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Affiliation(s)
| | - Bashkim Misini
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163AC A–1060 Vienna, Austria; E-Mail: (W.L.)
| | | | - Mariya V. Bukkel
- Tomsk Polytechnic University, Lenin av., 30, 634050, Tomsk, Russia
| | | | - Wolfgang Linert
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163AC A–1060 Vienna, Austria; E-Mail: (W.L.)
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Abstract
1. In rat pituitary tumour cells (GC cells), spontaneous oscillations of the intracellular concentration of Ca2+ ([Ca2+]i) induce growth hormone (GH) secretion that is inhibited by octreotide, a somatostatin (SRIF) agonist which binds to SRIF subtype (sst) receptor 2. The effects of its functional activation on the control of [Ca2+]i were investigated using fluorimetric measurements of [Ca2+]i. 2. SRIF decreases the basal [Ca2+]i and the [Ca2+]i rise in response to forskolin (FSK) through the inhibition of L-type voltage-dependent Ca2+ channels. 3. Pretreatment with octreotide or with L-Tyr8++ Cyanamid 154806, a sst2 receptor antagonist, abolishes the SRIF-induced inhibition of [Ca2+]i. Octreotide is known to operate through agonist-induced desensitization, while the antagonist operates through receptor blockade. 4. sst1 and sst2 receptor-immunoreactivities (-IRs) are localized to cell membranes. sst2, but not sst1 receptor-IR, internalizes after cell exposure to octreotide. 5. SRIF-induced inhibition of basal [Ca2+]i or FSK-induced Ca2+ entry is blocked by pertussis toxin (PTX). 6. FSK-induced cyclic AMP accumulation is only partially decreased by SRIF or octreotide, indicating that sst2 receptors are coupled to intracellular pathways other than adenylyl cyclase (AC) inhibition. 7. In the presence of H-89, an inhibitor of cyclic AMP-dependent protein kinase (PKA), SRIF-induced inhibition of basal [Ca2+]i is still present, although reduced in amplitude. 8. SRIF inhibits [Ca2+]i by activating sst2 receptors. Inhibition of AC activity is only partly responsible for this effect, and other transduction pathways may be involved.
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Affiliation(s)
- Cristina Petrucci
- Department of Physiology and Biochemistry ‘G. Moruzzi', University of Pisa, Via S. Zeno, 31-56127 Pisa, Italy
| | - Davide Cervia
- Department of Physiology and Biochemistry ‘G. Moruzzi', University of Pisa, Via S. Zeno, 31-56127 Pisa, Italy
| | - Marco Buzzi
- Department of Biology, University of Ferrara, 44100 Ferrara, Italy
| | - Carla Biondi
- Department of Biology, University of Ferrara, 44100 Ferrara, Italy
| | - Paola Bagnoli
- Department of Physiology and Biochemistry ‘G. Moruzzi', University of Pisa, Via S. Zeno, 31-56127 Pisa, Italy
- Author for correspondence:
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Abstract
Polarization effects on fluorescence measurements are a function of four independent variables. The first is F, the polarization ratio of the exciting light which reaches the sample. The second is r, the emission anisotropy of the sample, which is the polarization "response" of the sample to plane polarized exciting light. The third is G, the polarization ratio of the emission detection system, which is the ratio of the sensitivities of the detection system to vertically and horizontally polarized light. The fourth is α the viewing angle, which is the angle bet ween the direction of the propagation of the exciting light and the direction from which the emission is being detected. The intensity and the degree of polarization of the fluorescence emission that the sample exhibits are functions of F, r, and a, while the actual readings obtained with a typical spectrofluorimeter are functions of all four variables, F, r, α, and G. A theoretical analysis is made taking all these factors into account, and proper mathematical models are developed for the different modes of operation in which a fluorimeter can be used. These are verified experimentally with data obtained for a sample which has a high degree of emission anisotropy (Nile Blue A Perchlorate in glycerol). A recently designed goniospectrofluorimeter was used. Calibration procedures are developed and recommendations are made for modes of operation and fluorescence standards.
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Affiliation(s)
- E D Cehelnik
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - K D Mielenz
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R A Velapoldi
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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