1
|
Wang S, Zhou W, Wei Z, Li H, Xiao Y. Solvent-tuned perovskite heterostructures enable visual linoleic acid assay and edible oil species discrimination via wavelength shift. Food Chem 2024; 449:139190. [PMID: 38579653 DOI: 10.1016/j.foodchem.2024.139190] [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: 01/19/2024] [Revised: 03/24/2024] [Accepted: 03/28/2024] [Indexed: 04/07/2024]
Abstract
Linoleic acid (LA) detection and edible oils discrimination are essential for food safety. Recently, CsPbBr3@SiO2 heterostructures have been widely applied in edible oil assays, while deep insights into solvent effects on their structure and performance are often overlooked. Based on the suitable polarity and viscosity of cyclohexane, we prepared CsPbBr3@SiO2 Janus nanoparticles (JNPs) with high stability in edible oil and fast halogen-exchange (FHE) efficiency with oleylammonium iodide (OLAI). LA is selectively oxidized by lipoxidase to yield hydroxylated derivative (oxLA) capable of reacting with OLAI, thereby bridging LA content to naked-eye fluorescence color changes through the anti-FHE reaction. The established method for LA in edible oils exhibited consistent results with GC-MS analysis (p > 0.05). Since the LA content difference between edible oils, we further utilized chemometrics to accurately distinguish (100%) the species of edible oils. Overall, such elaborated CsPbBr3@SiO2 JNPs enable a refreshing strategy for edible oil discrimination.
Collapse
Affiliation(s)
- Shuo Wang
- Department of Thyroid and Breast Surgery, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China; Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Wenbin Zhou
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Zhongyu Wei
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Hang Li
- Department of Geriatrics, Zhongnan Hospital of Wuhan University, Wuhan 430071, Hubei, China.
| | - Yuxiu Xiao
- Department of Thyroid and Breast Surgery, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China; Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China.
| |
Collapse
|
2
|
Li H, Fu W, Yin J, Zhang J, Ran H, Zhang M, Jiang W, Zhu W, Li H, Dai S. Porous ionic liquids for oxidative desulfurization influenced by electrostatic solvent effect. J Colloid Interface Sci 2024; 662:160-170. [PMID: 38340515 DOI: 10.1016/j.jcis.2024.02.052] [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: 12/07/2023] [Revised: 01/12/2024] [Accepted: 02/05/2024] [Indexed: 02/12/2024]
Abstract
Developing a highly efficient strategy for the stabilization of the solid-liquid interface is a persistent pursuit for researchers. Herein, porous ionic liquids based on UiO-66 (Zr) porous materials were synthesized and applied to the selective desulfurization catalysis, which integrates the permanent pores of porous solids with the exceptional properties of ionic liquids. Results show that porous ionic liquids possess high activity and selectivity for dibenzothiophene. Experimental analysis and density functional theory calculations revealed that the ionic liquids moiety served as an extractant to enrich dibenzothiophene into the porous ionic liquids phase through the π···π and CH···π interactions. Additionally, the electrostatic solvent effect in the porous ionic liquids contributes to the stabilization solid-liquid interface, which was favorable for UiO-66 moiety to catalytically activate hydrogen peroxide (H2O2) to generate ·OH radicals, and subsequently oxidized dibenzothiophene to the corresponding sulfone. It is hoped that the development of porous ionic liquids could pave a new route to the stabilization of the solid-liquid interface for catalytic oxidation.
Collapse
Affiliation(s)
- Hongping Li
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Wendi Fu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Jie Yin
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Jinrui Zhang
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Hongshun Ran
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Ming Zhang
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Wei Jiang
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Wenshuai Zhu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
| | - Huaming Li
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
| | - Sheng Dai
- Department of Chemistry, University of Tennessee Knoxville, TN 37996, United States; Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States.
| |
Collapse
|
3
|
Ninomiya S, Rankin-Turner S, Akashi S, Hiraoka K. Solvent effect on the detection of peptides and proteins by nanoelectrospray ionization mass spectrometry: Anomalous behavior of aqueous 2-propanol. Anal Biochem 2024; 688:115461. [PMID: 38244751 DOI: 10.1016/j.ab.2024.115461] [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: 09/10/2023] [Revised: 11/13/2023] [Accepted: 01/13/2024] [Indexed: 01/22/2024]
Abstract
To investigate the solvent effect on the detection of peptides and proteins, nanoelectrospray mass spectra were measured for mixtures of 1 % acetic acid and 5 × 10-6 M gramicidin S (G), ubiquitin (U), and cytochrome c (C) in water (W), methanol (MeOH), 1-propanol (1-PrOH), acetonitrile (AcN), and 2-propanol (2-PrOH). Although doubly protonated G (G2+) and multiply protonated U (Un+) and C (Cn+) were readily detected with a wide range of mixing ratios of W solutions for MeOH, 1-PrOH, and AcN, Cn+ was totally suppressed for the solutions with mixing ratios (v/v) of W/2-PrOH (50/50) and (70/30). However, denatured Cn+ started to be detected with W/2-PrOH (90/10) together with Gn+ (n = 1, 2) and native Un+ (n = 6-8). At the mixing ratio of W/2-PrOH (95/5), native Cn+ (n = 7-10) together with Gn+ (n = 1, 2) and native Un+ (n = 6-8) were detected with high ion intensities. The use of W/2-PrOH (95/5) is profitable because it enables the detection of native proteins with high detection sensitivities.
Collapse
Affiliation(s)
- Satoshi Ninomiya
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.
| | - Stephanie Rankin-Turner
- Department of Molecular Microbiology & Immunology, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe Street, Baltimore, MD, 21205, USA
| | - Satoko Akashi
- Graduate School of Medical Life Science, Yokohama-City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan
| | - Kenzo Hiraoka
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.
| |
Collapse
|
4
|
Zhou C, Yan H, Yang W, Hu Y. Solubility determination and thermodynamic model analysis of L-α-glyceryl phosphorylcholine in different organic solvents of 278.15 K to 323.15 K. J Pharm Biomed Anal 2024; 241:115998. [PMID: 38330784 DOI: 10.1016/j.jpba.2024.115998] [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: 11/28/2023] [Revised: 01/06/2024] [Accepted: 01/20/2024] [Indexed: 02/10/2024]
Abstract
L-α-glyceryl phosphorylcholine, also referred to as choline ethanol phosphate and phosphocholine glycerophosphate, is a naturally occurring metabolite of water-soluble phospholipids in animals. This molecular property is important for informing the crystallization and purification of drugs. The solubility of L-α-glyceryl phosphorylcholine was determined in ten pure solvents and three mixed solvents under atmospheric pressure. The experimental results indicate that L-α-glyceryl phosphorylcholine is most soluble in methanol and least soluble in acetone. Additionally, the solubility of L-α-glyceryl phosphorylcholine was found to increase with temperature within the experimental range. Furthermore, the solubility of L-α-glyceryl phosphorylcholine in binary solvents is dependent on the proportion of positive solvent and temperature. The solubility of L-α-glyceryl phosphorylcholine increases with the proportion of positive solvent. XRD and DSC results indicate that the crystal form of L-α-glyceryl phosphorylcholine remains unchanged before and after dissolution in the reagent, and its melting point temperature is 413.15 K. Various models, including the modified Apelblat model, λh model, Jouyban-Acree model, SUN model, and CNIBS/R-K model, were used to fit the solubility data of L-α-glyceryl phosphorylcholine in different solvents. The study found that the modified Apelblat model and CNIBS/R-K model were the most appropriate for fitting the data. The KAT-LSER model was used to analyze the molecular interactions between solvents and solutes, revealing that the solvent step method with non-specific polarity/polarization interaction had the greatest impact on solubility.
Collapse
Affiliation(s)
- Changrui Zhou
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30, South Puzhu Road, Nanjing 211816, China
| | - Haijun Yan
- Jiangsu Provincial Institute of Materia Medica Co., Ltd, China
| | - Wenge Yang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30, South Puzhu Road, Nanjing 211816, China.
| | - Yonghong Hu
- College of Food Science and Light Industry, Nanjing Tech University, No. 30, South Puzhu Road, Nanjing 211816, China
| |
Collapse
|
5
|
Wang C, Chu Y, Lei Q, Hu M, Deng F, Xu J, Dai W. In Situ Observation of Solvent-Mediated Cyclic Intermediates during the Alkene Epoxidation/Hydration over a Ti-Beta/H 2O 2 System. Angew Chem Int Ed Engl 2024:e202404633. [PMID: 38509004 DOI: 10.1002/anie.202404633] [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: 03/07/2024] [Revised: 03/19/2024] [Accepted: 03/20/2024] [Indexed: 03/22/2024]
Abstract
Solvent effects in catalytic reactions have received widespread attention as they can promote reaction rates and product selectivities by orders of magnitude. It is well accepted that the stable five-membered cyclic intermediates formed between the solvent molecules and Ti species are crucial to the alkene epoxidation in a heterogeneous Ti(IV)-H2O2 system. However, the direct spectroscopic evidence of these intermediates is still missing and the corresponding reaction pathway for the alkene epoxidation remains unclear. By combining in situ 13C MAS NMR, two-dimensional (2D) 1H-13C heteronuclear correlation (HETCOR) NMR spectroscopy and theoretical calculations, the five-membered ring structures, where the protic solvents (ROH), and aprotic solvent (acetone), coordinate and stabilize the active Ti species, are identified for the first time over Ti-Beta/H2O2 system. Moreover, the role of these cyclic intermediates in the alkene epoxidation/hydration conversion is clarified. These results provide new insights into the solvent effect in liquid-phase epoxidation/hydration reactions over Ti(IV)-H2O2 system.
Collapse
Affiliation(s)
- Chang Wang
- School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350, P. R. China
| | - Yueying Chu
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Qifeng Lei
- School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350, P. R. China
| | - Min Hu
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Feng Deng
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Jun Xu
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Weili Dai
- School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350, P. R. China
| |
Collapse
|
6
|
Manna D, Lo R, Vacek J, Miriyala VM, Bouř P, Wu T, Osifová Z, Nachtigallová D, Dračinský M, Hobza P. The Stability of Hydrogen-Bonded Ion-Pair Complex Unexpectedly Increases with Increasing Solvent Polarity. Angew Chem Int Ed Engl 2024:e202403218. [PMID: 38497312 DOI: 10.1002/anie.202403218] [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: 02/15/2024] [Revised: 03/12/2024] [Accepted: 03/13/2024] [Indexed: 03/19/2024]
Abstract
The generally observed decrease of the electrostatic energy in the complex with increasing solvent polarity has led to the assumption that the stability of the complexes with ion-pair hydrogen bonds decreases with increasing solvent polarity. Besides, the smaller solvent-accessible surface area (SASA) of the complex in comparison with the isolated subsystems results in a smaller solvation energy of the latter, leading to a destabilization of the complex in the solvent compared to the gas phase. In our study, which combines Nuclear Magnetic Resonance, Infrared Spectroscopy experiments, quantum chemical calculations, and molecular dynamics (MD) simulations, we question the general validity of this statement. We demonstrate that the binding free energy of the ion-pair hydrogen-bonded complex between 2-fluoropropionic acid and n-butylamine (CH3CHFCOO-…NH3But+) increases with increased solvent polarity. This phenomenon is rationalized by a substantial charge transfer between the subsystems that constitute the ion-pair hydrogen-bonded complex. This unexpected finding introduces a new perspective to our understanding of solvation dynamics, emphasizing the interplay between solvent polarity and molecular stability within hydrogen-bonded systems.
Collapse
Affiliation(s)
- Debashree Manna
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Rabindranath Lo
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Jaroslav Vacek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
- IT4Innovations, VŠB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00, Ostrava-Poruba, Czech Republic
- Faculty of Science, Palacký University Olomouc, 17. Listopadu 1192/12, 779 00, Olomouc, Czech Republic
| | - Vijay Madhav Miriyala
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Petr Bouř
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Tao Wu
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Zuzana Osifová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Dana Nachtigallová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
- IT4Innovations, VŠB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00, Ostrava-Poruba, Czech Republic
| | - Martin Dračinský
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
| | - Pavel Hobza
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo námĕstí 542/2, 160 00, Prague, Czech Republic
- IT4Innovations, VŠB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00, Ostrava-Poruba, Czech Republic
| |
Collapse
|
7
|
Resende LF, Pliego JR. Modeling the alkylation of amines with alkyl bromides: explaining the low selectivity due to multiple alkylation. J Mol Model 2024; 30:107. [PMID: 38492112 DOI: 10.1007/s00894-024-05902-7] [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: 11/13/2023] [Accepted: 03/12/2024] [Indexed: 03/18/2024]
Abstract
CONTEXT Nucleophilic substitution reactions of aliphatic amines with alkyl halides represent a simple and direct mechanism for obtaining higher-order aliphatic amines. However, it is well known that these reactions suffer from low selectivity due to multiple alkylations, which is attributed to the higher reactivity of the newly formed amine. In order to provide a detailed explanation for this kind of system, we have investigated the reactivity of primary and secondary amines with 1-bromopropane and 2-bromopropane. The free energy profile in acetonitrile solution was obtained and a detailed microkinetic analysis was needed to analyze this complex reaction system. We have found that the product of the first alkylation is an ion pair corresponding to the protonated secondary amine and the bromide ion, which can transfer the proton to the reactant primary amine. Then, the newly formed secondary amine can also react, leading to a second alkylation to produce a tertiary protonated amine. Our modeling points out that both the proton transfer equilibria and the similar reactivity of the primary and secondary amines produce reduced selectivity. The proton transfer equilibria also contribute to slowing down the kinetics of the first alkylation. METHODS The exploration of the mechanism was done by geometry optimization using the CPCM/X3LYP/ma-def2-SVP method, followed by harmonic frequency calculation at this same level of theory. A composite approach was used to obtain the free energy profile, using the more accurate ωB97X-D3/ma-def2-TZVPP level of theory for electronic energy and the SMD model for the solvation free energy. These calculations were performed with the ORCA 4 program. The detailed microkinetic analysis was done using the Kintecus program.
Collapse
Affiliation(s)
- Luis F Resende
- Departamento de Ciências Naturais, Universidade Federal de São João del Rei, São João del Rei, MG, 36301-160, Brazil
| | - Josefredo R Pliego
- Departamento de Ciências Naturais, Universidade Federal de São João del Rei, São João del Rei, MG, 36301-160, Brazil.
| |
Collapse
|
8
|
Ma M, Wang Y, Sun C. Synchronous or stepwise Mechanism? a theoretical study on the Excited-State double proton transfer properties of shikonin and acetylshikosin. Spectrochim Acta A Mol Biomol Spectrosc 2024; 308:123689. [PMID: 38064961 DOI: 10.1016/j.saa.2023.123689] [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] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/10/2023] [Accepted: 11/26/2023] [Indexed: 01/13/2024]
Abstract
The excited state double proton transfer (ESDPT) mechanism of shikonin (Shk) and its derivative acetylshikosin (AcShk) were studied by density functional theory (DFT) and time-dependent density functional theory (TD-DFT) methods. The potential energy curves scanned along the coordinates of proton transfer indicate a preference for the ESDPT reaction to occur step by step. The AcShk molecule possesses an additional reaction pathway in comparison to the Shk molecule. Furthermore, efforts have been made to compute the absorption and fluorescence peak, which exhibits favorable conformity with the experimental findings of the system investigated. The fluorescence spectra in cyclohexane and acetonitrile solvents indicate that the solvent polarity affects the location of the ESDPT fluorescence peak in both Shk and AcShk systems. The fluorescence spectra concentrated in the green light region (504 nm ∼ 550 nm) are obtained, which has the potential to promote human health through disinfection and boosting the immune system.
Collapse
Affiliation(s)
- Min Ma
- College of Science, Northeast Forestry University, Harbin 150040, China
| | - Ye Wang
- College of Physics and Electronic Information, Baicheng Normal University, Baicheng 137000, China.
| | - Chaofan Sun
- College of Science, Northeast Forestry University, Harbin 150040, China.
| |
Collapse
|
9
|
Kaur K, Kaur H, Sharma R, Kumar Sood A, Kumar M, Bhalla V. Nanophotosensitizing through Space Charge Transfer Assemblies of Pentacenequinone Derivative for 'Metal-free' Photoamidation Reactions. Chem Asian J 2024; 19:e202300954. [PMID: 38258959 DOI: 10.1002/asia.202300954] [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: 10/30/2023] [Revised: 01/22/2024] [Accepted: 01/22/2024] [Indexed: 01/24/2024]
Abstract
The present study demonstrates the influence of small portion (20 %) of organic co-solvent (DMSO/THF/ACN/MeOH) in mixed aqueous media (80 % water) in controlling the size, quantum yield and life time of the through space charge transfer assemblies (TSCT) of pentacenequinone derivative (TPy-PCQ-TPy). Among various solvent systems [H2 O : DMSO (8 : 2), H2 O : THF (8 : 2), H2 O : ACN (8 : 2) and H2 O : MeOH (8 : 2)] examined, highly emissive (Φf =12 %) and nano-sized assemblies having long life time (3.11 ns) were formed in H2 O : DMSO (8 : 2) solvent system. The solvent dependent differences in the size and excited state properties of TPy-PCQ-TPy assemblies are reflected in their photosensitizing behaviour in different solvent systems. Backed by excellent photosensitizing properties, TPy-PCQ-TPy assemblies smoothly catalyse the photoamidation reactions between unactivated/activated aldehydes and secondary amine under mild reaction conditions (visible light irradiation, aerial atmosphere, room temperature) in H2 O : DMSO (8 : 2) solvent mixture. The as prepared assemblies of TPy-PCQ-TPy also exhibit high potential to catalyse the oxidation of benzyl alcohols to aromatic aldehydes, thus, generating a possibility to use aromatic alcohols as the starting material in photoamidation reactions. The real time application of TSCT assemblies has also been demonstrated in gram scale transformation of aromatic aldehydes to aromatic amides and photooxidation of benzyl alcohol to aromatic aldehyde.
Collapse
Affiliation(s)
- Kulwinder Kaur
- Department of Chemistry, UGC Centre for Advanced Study-II, Guru Nanak Dev University, 143005, Amritsar, Punjab, India
| | - Harpreet Kaur
- Department of Chemistry, UGC Centre for Advanced Study-II, Guru Nanak Dev University, 143005, Amritsar, Punjab, India
| | - Rajat Sharma
- Department of Chemistry, UGC Centre for Advanced Study-II, Guru Nanak Dev University, 143005, Amritsar, Punjab, India
| | - Ashwani Kumar Sood
- Department of Chemistry, UGC Centre for Advanced Study-II, Guru Nanak Dev University, 143005, Amritsar, Punjab, India
| | - Manoj Kumar
- Department of Chemistry, UGC Centre for Advanced Study-II, Guru Nanak Dev University, 143005, Amritsar, Punjab, India
| | - Vandana Bhalla
- Department of Chemistry, UGC Centre for Advanced Study-II, Guru Nanak Dev University, 143005, Amritsar, Punjab, India
| |
Collapse
|
10
|
Aktar MS, de Serrano V, Ghiladi R, Franzen S. Comparative study of the binding and activation of 2,4-dichlorophenol by dehaloperoxidase A and B. J Inorg Biochem 2023; 247:112332. [PMID: 37480762 DOI: 10.1016/j.jinorgbio.2023.112332] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/11/2023] [Accepted: 07/14/2023] [Indexed: 07/24/2023]
Abstract
The dehaloperoxidase-hemoglobin (DHP), first isolated from the coelom of a marine terebellid polychaete, Amphitrite ornata, is an example of a multi-functional heme enzyme. Long known for its reversible oxygen (O2) binding, further studies have established DHP activity as a peroxidase, oxidase, oxygenase, and peroxygenase. The specific reactivity depends on substrate binding at various internal and external binding sites. This study focuses on comparison of the binding and reactivity of the substrate 2,4-dichlorophenol (DCP) in the isoforms DHPA and B. There is strong interest in the degradation of DCP because of its wide use in the chemical industry, presence in waste streams, and particular reactivity to form dioxins, some of the most toxic compounds known. The catalytic efficiency is 3.5 times higher for DCP oxidation in DHPB than DHPA by a peroxidase mechanism. However, DHPA and B both show self-inhibition even at modest concentrations of DCP. This phenomenon is analogous to the self-inhibition of 2,4,6-trichlorophenol (TCP) at higher concentration. The activation energies of the electron transfer steps in DCP in DHPA and DHPB are 19.3 ± 2.5 and 24.3 ± 3.2 kJ/mol, respectively, compared to 37.2 ± 6.5 kJ/mol in horseradish peroxidase (HRP), which may be a result of the more facile electron transfer of an internally bound substrate in DHPA. The x-ray crystal structure of DHPA bound with DCP determined at 1.48 Å resolution, shows tight substrate binding inside the heme pocket of DHPA (PDB 8EJN). This research contributes to the studies of DHP as a naturally occurring bioremediation enzyme capable of oxidizing a wide range of environmental pollutants.
Collapse
Affiliation(s)
- Mst Sharmin Aktar
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, United States of America
| | - Vesna de Serrano
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, United States of America
| | - Reza Ghiladi
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, United States of America
| | - Stefan Franzen
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, United States of America.
| |
Collapse
|
11
|
Zhao X, Li Y, Lin S, Liu C, Guo X, Li X, He L, Chen X, Ye G. DFT studies of solvent effect in hydrogen abstraction reactions from different allyl-type monomers with benzoyl radical. BMC Chem 2023; 17:111. [PMID: 37700296 PMCID: PMC10496217 DOI: 10.1186/s13065-023-01027-9] [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: 04/04/2023] [Accepted: 08/29/2023] [Indexed: 09/14/2023] Open
Abstract
Inert allyl-type monomers have been widely documented due to reduce degradation chain transfer. Recently, we and others discovered that the [3 + 2] cyclization reaction process by a photo-driven radical reaction, which can accelerate the polymerization. It was discovered that allyl ether monomers had much higher reactivity than other allyl monomers in the suspension photopolymerization initiated by Type I photoinitiator. Since the hydrogen abstraction reaction (HAR) is the initial step of cyclization, and in order to clarify the influence of solvents effect, three allyl-type monomers were employed, containing "O", "N" and "S" atom as hydrogen donors. The benzoyl radical obtained from cleavage of photoinitiator was chosen as hydrogen acceptors. We explored the hydrogen abstraction reaction in different solvents (methanol, water and DMSO) by quantum chemistry for geometry and energy. An investigation was undertaken regarding the structural orbital by electrostatic potential (ESP) and topological analysis (ELF and LOL). The findings were also combined with the distortion model and transition state theory. We obtained the molecular interactions used independent gradient method in the Hirshfeld molecular density partition (IGMH). The Eckart's correction allowed to examine the driving factors of the hydrogen abstraction reaction tunnels and these reactions constant rates are determined in the range of 500-2500 K depending on the modified Arrhenius form in different solvents effect. Our results can provide an answer for the different reactivities.
Collapse
Affiliation(s)
- Xiaotian Zhao
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - YaMing Li
- Department of Stomatology, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Shibo Lin
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Chun Liu
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Xirui Guo
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Xuanhao Li
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Lihui He
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Xi Chen
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Guodong Ye
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target and Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, 511436, China.
| |
Collapse
|
12
|
Naumov S, Herzog B, Abel B. Spectra and photorelaxation of tris-biphenyl-triazine-type UV absorbers: from monomers to nanoparticles. Photochem Photobiol Sci 2023; 22:2143-2151. [PMID: 37277672 DOI: 10.1007/s43630-023-00436-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 05/07/2023] [Indexed: 06/07/2023]
Abstract
Water-insoluble organic UV filters like tris-biphenyl-triazine (TBPT) can be prepared as aqueous dispersions of nanoparticles. The particles consist of the respective UV absorber molecules and show strong UV absorbance. Since there is a certain solubility of such UV absorbers in organic solvents, it is possible to measure the absorbance spectrum also in solution, for instance in ethanol or dioxane. The UV spectrum of the aqueous dispersion shows a slight hypsochromic shift of the original band with an additional shoulder at longer wavelengths. For the understanding of the observed changes of UV-Vis spectra of this UV absorber, either dissolved in an organic solvent or dispersed as nanoparticles in water, DFT calculations were carried out with the respective monomer and aggregates of TBPT molecules in the different media. The calculated UV-Vis spectra of isolated, that means dissolved, TBPT molecules in ethanol and in dioxane agree well with experimentally observed ones. The observed changes in the shape of experimental UV-Vis spectra in aqueous dispersion cannot be explained with a solvent effect only. It was found that the studied molecules could form stable energetically favorable π-stacked aggregates, which show UV-Vis spectra in reasonable agreement with those experimentally observed in aqueous dispersion. Such aggregates of TBPT are most likely the reason for the observed additional shoulder in the UV/vis absorbance spectrum. In addition, the mechanism of the photochemical deactivation of excited TBPT molecules was studied in detail with TD DFT in dioxane and in water.
Collapse
Affiliation(s)
- Sergej Naumov
- Leibniz Institute of Surface Engineering (IOM), Permoserstrasse 15, 04318, Leipzig, Germany
| | - Bernd Herzog
- BASF Grenzach GmbH, Koechlinstr. 1, 79639, Grenzach-Wyhlen, Germany
| | - Bernd Abel
- Leibniz Institute of Surface Engineering (IOM), Permoserstrasse 15, 04318, Leipzig, Germany.
- Institute of Chemical Technology and Wilhelm-Ostwald-Institute of Physical and Theoretical Chemistry, Linnestrasse 3, 04103, Leipzig, Germany.
| |
Collapse
|
13
|
Hong S, Park B, Balamurugan C, Lee J, Kwon S. Impact of solvents on doctor blade coatings and bathocuproine cathode interlayer for large-area organic solar cell modules. Heliyon 2023; 9:e18209. [PMID: 37519700 PMCID: PMC10372324 DOI: 10.1016/j.heliyon.2023.e18209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 07/06/2023] [Accepted: 07/11/2023] [Indexed: 08/01/2023] Open
Abstract
Efforts to commercialize organic solar cells (OSCs) by developing roll-to-roll compatible modules have encountered challenges in optimizing printing processes to attain laboratory-level performance in fully printable OSC architectures. In this study, we present efficient OSC modules fabricated solely through printing methods. We systematically evaluated the impact of processing solvents on the morphology of crucial layers, such as the hole transport, photoactive, and electron transport layers, applied using the doctor blade coating method, with a particular focus on processability. Notably, deposition of charge transport layer using printing techniques is still a challenging task, mainly due to the hydrophobic characteristic of the organic photoactive layer. To overcome this issue, we investigated the solvent effect of a well-studied cathode interlayer, bathocuproine (BCP). We were able to form a uniform thin BCP film (∼10 nm) on a non-fullerene based organic photoactive layer using the doctor bladed coating method. Our results showed that the use of volatile alcohols in the BCP processing required a delicate balance between wettability and vaporization, which contrasted with the results for spin-coated films. These findings provide important insights into improving the efficiency of printing techniques for depositing charge transport layers. The fully printed OSC modules, featuring uniform and continuous BCP layer formation, achieved an impressive power conversion efficiency of 10.8% with a total area of 10.0 cm2 and a geometrical fill factor of 86.5%.
Collapse
Affiliation(s)
- Soonil Hong
- Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
| | - Byoungwook Park
- Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
| | - Chandran Balamurugan
- Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea
| | - Jinho Lee
- Department of Physics, Incheon National University, 119 Academy-ro, Incheon 22012, Republic of Korea
| | - Sooncheol Kwon
- Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea
| |
Collapse
|
14
|
Zheng X, Yang N, Hou Y, Cai K. Dissecting amide-I vibrations in histidine dipeptide. Spectrochim Acta A Mol Biomol Spectrosc 2023; 292:122424. [PMID: 36750008 DOI: 10.1016/j.saa.2023.122424] [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: 09/27/2022] [Revised: 01/27/2023] [Accepted: 01/28/2023] [Indexed: 06/18/2023]
Abstract
The amide-I vibrational characteristics and conformational preferences of the model compound - histidine dipeptide (Ac-His-NHCH3, HISD) in gas phase and solution have been revealed with the help of ab initio calculations and wavefunction analyses. The Gibbs free energy surfaces (FESs) of solvated HISD were smoothed by solvent effect to exhibit different structural populations concerning various external environments. It was shown that the most stable conformations of HISD in CHCl3 and gas phase are C7eq, while those in DMSO and water are β and PPII, respectively. Compared with ALAD, the number of accessible conformational states on these FESs was predicted to be reduced due to the steric effect of imidazole group. The two amide-I normal modes of HISD were found to have intrinsically secondary structural dependencies, and be sensitive to surrounding environments. The average amide-Ia frequencies of HISD isomers in these environments were predicted to be almost the same as those of ALAD, while the amide-Ib mean frequencies were estimated to be lower than ALAD due to the intramolecular interactions between the imidazole group and amino-terminal amide unit. The good linear correlations between amide-I frequencies and the atomic electrostatic potentials (ESPs) of amide groups were also found to interpret the solvent-induced amide-I frequency shifts of HISD at the electronic structure level. These results allow us to gain a deep understanding of amide-I vibrations of HISD, and would be helpful for the site-specific conformational monitoring and spectral interpretation of solvated polypeptides.
Collapse
Affiliation(s)
- Xuan Zheng
- College of Chemistry, Chemical Engineering and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Fujian Provincial Key Laboratory of Pollution Monitoring and Control, Minnan Normal University, Zhangzhou 363000, PR China.
| | - Nairong Yang
- College of Chemistry, Chemical Engineering and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Fujian Provincial Key Laboratory of Pollution Monitoring and Control, Minnan Normal University, Zhangzhou 363000, PR China
| | - Yanjun Hou
- College of Chemistry, Chemical Engineering and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Fujian Provincial Key Laboratory of Pollution Monitoring and Control, Minnan Normal University, Zhangzhou 363000, PR China
| | - Kaicong Cai
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou 350007, PR China; Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen 361005, PR China; Fujian Provincial Key Laboratory of Featured Biochemical and Chemical Materials, Ningde Normal University, Ningde 352100, PR China.
| |
Collapse
|
15
|
Majhi R, Maharjan R, Shrestha M, Mali A, Basnet A, Baral M, Duwal R, Manandhar R, Rajbhandari P. Effect of altitude and solvent on Psidium guajava Linn. leaves extracts: phytochemical analysis, antioxidant, cytotoxicity and antimicrobial activity against food spoilage microbes. BMC Chem 2023; 17:36. [PMID: 37055840 PMCID: PMC10100324 DOI: 10.1186/s13065-023-00948-9] [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: 02/11/2022] [Accepted: 04/05/2023] [Indexed: 04/15/2023] Open
Abstract
BACKGROUND Guava (Psidium guajava Linn.) has been traditionally used in the treatment of a wide range of diseases due to its rich content of secondary metabolites. AIM This study was aimed to evaluate the effect of altitude and solvent systems on guava leaves crude extract's phenolics and flavonoid content, antioxidant, antimicrobial, and toxicity nature. METHODS Guava leaves were collected from three different geographical locations in Nepal while solvents with an increasing polarity index were used for extraction. The yield percentage of extracts was calculated. Total Phenolic Content, Total Flavonoid Content, and antioxidant activity were determined by the Folin-Ciocalteu method, Aluminium chloride colorimetric method, and DPPH (2,2'-Diphenyl-1-picrylhydrazyl) assay respectively. The quantification of fisetin and quercetin was performed using the HPLC with method validation. The antimicrobial activity of the extracts was tested against bacteria and fungus isolated from spoiled fruits and vegetables and identified through 16s and 18s rRNA sequencing. Finally, Brine Shrimp Lethality Assay (BSLA) was used for testing the toxicity of the extracts. RESULTS The phenolic and total flavonoid content was found to be higher in ethanol extract (331.84 mg GAE/g dry extract) and methanol extract (95.53 mg QE/g dry extract) from Kuleshwor respectively. Water extract of guava leaves from Kuleshwor (WGK) did not show significantly different antioxidant activity when compared to methanol and ethanol extracts. Fisetin and quercetin were higher in WGK (1.176 mg/100 g) and (10.967 mg/100 g) dry extract weight respectively. Antibacterial activity against food spoilage bacteria was dose-dependent and found to be highest for all the extracts from different solvents and altitudes at higher concentrations (80 mg/ml). Similarly, methanol and ethanol guava extracts from all locations showed antifungal activity against Geotrichum candidum RIBB-SCM43 and Geotrichum candidum RIBB-SCM44. WGK was found to be non-toxic. CONCLUSION Our study concludes that the antioxidant and antimicrobial activity of WGK was found to be similar statistically to that of methanol and ethanol extracts of Bishnupur Katti and Mahajidiya. These results suggest the possibility of using water as a sustainable solvent to extract natural antioxidant and antimicrobial compounds which can further be used as natural preservatives to extend the shelf life of fruits and vegetables.
Collapse
Affiliation(s)
- Rita Majhi
- Department of Natural Product and Green Chemistry, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Rukusha Maharjan
- Department of Natural Product and Green Chemistry, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Mitesh Shrestha
- Department of Applied Microbiology and Food Technology, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Aatish Mali
- Department of Natural Product and Green Chemistry, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Angisha Basnet
- Department of Natural Product and Green Chemistry, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Manish Baral
- Department of Plant Physiology and Environmental Sciences, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Rabin Duwal
- Department of Applied Microbiology and Food Technology, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Rojlina Manandhar
- Department of Natural Product and Green Chemistry, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal
| | - Prajwal Rajbhandari
- Department of Applied Microbiology and Food Technology, Research Institute for Bioscience and Biotechnology (RIBB), Kathmandu, Nepal.
| |
Collapse
|
16
|
Guidugli S, Villegas M, Benegas J, Donati I, Paoletti S. Solvation and expansion of neutral and charged chains of a carbohydrate polyelectrolyte: Galacturonan in water. A critical revisiting. Biophys Chem 2023; 295:106960. [PMID: 36806954 DOI: 10.1016/j.bpc.2023.106960] [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: 11/14/2022] [Revised: 01/13/2023] [Accepted: 01/19/2023] [Indexed: 02/05/2023]
Abstract
Experimental and theoretical data have been revisited to shed light onto the aspects of hydration and chain expansion of pectic acid (galacturonan) upon charging. The prediction of the variation of the number of solvation water molecules between the two limit ionization states from theoretical calculations was confirmed to a very high accuracy by the corresponding number evaluated form dilatometric measurements. The relevance of hydration to the mechanism of bonding of calcium ions by sodium pectate is discussed. Characterization of polymer expansion has been obtained by calculating the values of the characteristic ratio and/or the persistence length on the respective populations and comparing the theoretical predictions with experimental data. The results show that a charged chain in typical conditions of ionic strength is more expanded than its neutral counterpart, whereas the ideal limit (31 and 21) helical conformations in the uncharged and totally charged conditions, respectively, share the same value of the linear advance of the helical repeat, when the ionic strength tends to infinite. Total divergence between theoretical predictions and experimental evidence rules out the possibility that carboxylate charge reduction by protonation and by methyl esterification are equivalent in determining the solution behavior of galacturonan.
Collapse
Affiliation(s)
- Silvina Guidugli
- Instituto de Matemática Aplicada San Luis (IMASL), Departamento de Física, Universidad Nacional de San Luis, CONICET, Ejército De Los Andes 950, 5700 San Luis, Argentina
| | - Myriam Villegas
- Instituto de Matemática Aplicada San Luis (IMASL), Departamento de Física, Universidad Nacional de San Luis, CONICET, Ejército De Los Andes 950, 5700 San Luis, Argentina
| | - Julio Benegas
- Instituto de Matemática Aplicada San Luis (IMASL), Departamento de Física, Universidad Nacional de San Luis, CONICET, Ejército De Los Andes 950, 5700 San Luis, Argentina
| | - Ivan Donati
- Dipartimento di Scienze della Vita, Università degli Studi di Trieste, I-34127 Trieste, Italy.
| | - Sergio Paoletti
- Dipartimento di Scienze della Vita, Università degli Studi di Trieste, I-34127 Trieste, Italy
| |
Collapse
|
17
|
Chen M, Li Z, Sun G, Jin S, Hao X, Zhang C, Liu L, Zhang L, Liu H. Theoretical study on the free radical scavenging potency and mechanism of natural coumestans: Roles of substituent, noncovalent interaction and solvent. Phytochemistry 2023; 207:113580. [PMID: 36587886 DOI: 10.1016/j.phytochem.2022.113580] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 11/09/2022] [Revised: 12/19/2022] [Accepted: 12/28/2022] [Indexed: 06/17/2023]
Abstract
The free radical scavenging potency and mechanisms of seven representative natural coumestans were systematically evaluated using density functional theory (DFT) approach. Thermodynamic feasibility of different mechanisms was assessed by various physio-chemical descriptors involved in the double (2H+/2e‒) radical-trapping processes. Energy diagram and related transition state structures of the reaction between wedelolactone (WEL) and hydroperoxyl radical were constructed to further uncover the radical-trapping details. Results showed that the studied coumestans prefer to scavenge radicals via formal hydrogen atom transfer (fHAT) mechanism in the gas phase and non-polar environment, whereas sequential proton loss electron transfer (SPLET) is favored in polar media. Moreover, the feasibility of second fHAT and SPLET processes was also revealed. Sequential double proton loss double electron transfer (SdPLdET) mechanism represents the preferred pathway in aqueous solution at physiological pH. Our findings highlight the essential role of ortho-dihydroxyl group, noncovalent interaction and solvents on radical-trapping potency. 4'-OH in D-ring was found to be the most favorable site to trap radical for most of the studied coumestans, whereas 3-OH in A-ring for lucernol (LUN).
Collapse
Affiliation(s)
- Mohan Chen
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Zheng Li
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Gang Sun
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Shuang Jin
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Xiyue Hao
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Chi Zhang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Ling Liu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Ling Zhang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Hongli Liu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, No.209, Tongshan Road, Xuzhou, Jiangsu, 221004, China.
| |
Collapse
|
18
|
Huang Z, Lu L, Li X, Zhang Z, Shen J, Cui B, Guo L, Yuan C, Zhang S. Effects of mesylate-/tartrate-based ionic liquids-water mixtures on the phase transition behaviors and stability of corn starch: A comparative study. Carbohydr Polym 2023; 303:120456. [PMID: 36657861 DOI: 10.1016/j.carbpol.2022.120456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/25/2022] [Accepted: 12/08/2022] [Indexed: 12/15/2022]
Abstract
As one of the most important biopolymers, starch has been applied to replace petroleum-derived polymers for "green" materials. Discovery of novel solvents and understanding of the solvent effects are critical challenges for the destruction of strong hydrogen bonds of starch molecules for manufacturing bio-based materials. Herein, two ionic liquids (ILs), 1-ethyl-3-methyl-imidazolium mesylate ([Emim][MS]) and 1-ethyl-3-methyl-imidazolium tartrate ([Emim][Tar]), were explored as novel solvents for starch. Their effects on phase transition behaviors, microstructure, hydrogen-bond interaction, crystalline structure, micromorphology and thermal stability of corn starch were compared systematically. With the IL/H2O ratio increasing, the starch/IL/H2O mixtures underwent endothermic, exothermic/endothermic and exothermic processes, sequentially. However, the starch properties were very different in two ILs-water systems, which were closely related to the solvent composition and IL structure. These differences were further explained by the interactions among starch, water and the two ILs on the basis of the quantum chemical calculations. It was found that [Emim][MS] had a stronger interaction with water than starch, whereas [Emim][Tar] preferred to bind with starch. This study not only provided experimental supports for understanding the starch behaviors in novel "green" solvents, but also laid the theoretical foundation for starch modification and industrial applications of starch-based materials in more appropriate solvents.
Collapse
Affiliation(s)
- Zunxiang Huang
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
| | - Lu Lu
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China.
| | - Xueting Li
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
| | - Ziling Zhang
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
| | - Jingmin Shen
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
| | - Bo Cui
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China.
| | - Li Guo
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
| | - Chao Yuan
- State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
| | - Shiqing Zhang
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 Xi Qi Dao, Tianjin Airport Economic Area, Tianjin 300308, China.
| |
Collapse
|
19
|
Zhu Y, Li B, Huang W, He Y, Liu X. Tuning solvent-solute interactions enable visual colorimetric detection of nitro-aromatic explosives. ANAL SCI 2023; 39:115-121. [PMID: 36223061 DOI: 10.1007/s44211-022-00198-0] [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: 08/08/2022] [Accepted: 09/29/2022] [Indexed: 01/06/2023]
Abstract
The Janowski reaction is a critical reaction for visual colorimetric detection of nitro-aromatic explosives. However, the solvent effect is still not well explored. Herein, we report the solvent-dependent activity of the Janowski reaction between 2,4-dinitrotoluene (DNT)/2,4,6-trinitrotoluene (TNT) and NaOH. Four common solvents are studied. It is found that acetone with high donor number and low polarity is able to readily dissolve the product of Janowski reaction (Meisenheimer complexes) via Lewis acid-base interactions and solvation rules, facilitating the Janowski reactions between DNT/TNT and NaOH. Based on the color change of the Janowski reactions within acetone, a visual colorimetric assay is established. The present assay can detect DNT and TNT with a detection limit of 1.4 μM and 1.2 μM, which allows for naked-eye detection. In addition, this assay is highly selective and applicable to DNT/TNT detection in soil samples. Our work reveals the solvent effect on the Janowski reaction, providing a simple and rapid method for detection of nitro-aromatic explosives.
Collapse
Affiliation(s)
- Yongbing Zhu
- Anhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, Anhui, China.,State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
| | - Boyan Li
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Wei Huang
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Yi He
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, China. .,Xinjiang Key Laboratory of Explosives Safety Science, Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China.
| | - Xiaodong Liu
- Anhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, Anhui, China.
| |
Collapse
|
20
|
Muthu M, Tiwari S. Spectroscopic investigation of preferential solvation of N-confused tetraphenylporphyrinin binary mixtures of dichloromethane with organic cosolvents. Spectrochim Acta A Mol Biomol Spectrosc 2022; 283:121718. [PMID: 35963116 DOI: 10.1016/j.saa.2022.121718] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 07/24/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
Spectroscopic behaviour of porphyrin is known to be sensitive to the choice of the solvent and has been used to probe solvation phenomena. The UV-visible spectra of N-confused tetraphenylporphyrin are observed in a series of binary solvent mixtures - (dichloromethane + diethyl ether), (dichloromethane + chlorobenzene) and (dichloromethane + ethyl acetate). The resulting ET scale for NCTPP solvation indicates nonlinear behaviour and preferential solvation by a solvent-solvent complex in all the three solvents - with the dichloromethane + ethyl acetate system showing the largest deviation from ideality. The data is fitted to the model based on solvent exchange equilibria for determining the preferential solvation parameters which are specific to the probe as well as the identity of solvents in the binary mixture. Further analysis using polarity parameters from literature indicate that the solvation of NCTPP in the (dichloromethane + ethyl acetate) mixture is dependent on the hydrogen bond accepting capacity and polarizability of the medium. Excess spectra derived from ATR-FTIR measurement of dichloromethane + ethyl acetate solutions lead to important inferences about the structure and role of solvent-solvent interactions responsible for the preferential solvation.
Collapse
Affiliation(s)
- Mariammal Muthu
- Department of Chemistry, Institute of Chemical Technology, Mumbai 400019, India
| | - Shraeddha Tiwari
- Department of Chemistry, Institute of Chemical Technology, Mumbai 400019, India.
| |
Collapse
|
21
|
Alirezapour F, Bamdad K, Khanmohammadi A, Ebrahimi N. A computational study on acetaminophen drug complexed with Mn +, Fe 2+, Co +, Ni 2+, and Cu + ions: structural analysis, electronic properties, and solvent effects. J Mol Model 2022; 28:302. [PMID: 36066774 DOI: 10.1007/s00894-022-05305-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 08/30/2022] [Indexed: 11/24/2022]
Abstract
In the present research, the cation-π interactions in acetaminophen-M complexes (M = Mn+, Fe2+, Co+, Ni2+, and Cu+) are investigated using density functional theory (DFT/ωB97XD) in the gas phase and solution. The results show that the absolute values of energy are reduced in going from the gas phase to the solution. Based on the obtained data, the complexes in water are the most stable. The natural bond orbital (NBO) and the atoms in molecules (AIM) analyses are also applied to achieve more details about the nature of interactions. These results are useful for understanding the role of the drug-receptor interactions in the complexes. According to AIM outcomes, the cation-π interactions are the closed-shell and may indicate the partially covalent nature in the complexes. A comprehensive analysis is also performed on the conceptual DFT parameters of the complexes to evaluate their electronic properties. Our findings show increasing the stability and decreasing the reactivity of the complexes in the solution phase with respect to the gas phase. These interactions are ubiquitous in biological systems, and their importance in theoretical models led us to study such important interactions. The results of this study may be useful for the design and synthesis of a variety of supramolecular complexes with the desired properties.
Collapse
Affiliation(s)
- Fahimeh Alirezapour
- Department of Chemistry, Payame Noor University (PNU), P.O. Box 19395-4697, Tehran, Iran.
| | - Kourosh Bamdad
- Department of Chemistry, Payame Noor University (PNU), P.O. Box 19395-4697, Tehran, Iran
| | - Azadeh Khanmohammadi
- Department of Chemistry, Payame Noor University (PNU), P.O. Box 19395-4697, Tehran, Iran
| | - Narjes Ebrahimi
- Department of Chemistry, Payame Noor University (PNU), P.O. Box 19395-4697, Tehran, Iran
| |
Collapse
|
22
|
Jouandon N, Hammoud J, Touron A, Bailly L, Le Foll A, Joosten AYP, Lecourt T. Preparation of propargyl 1,2-orthoesters of carbohydrates: From side reactions in dichloromethane to optimized reaction conditions in acetonitrile. Carbohydr Res 2022; 521:108652. [PMID: 36037648 DOI: 10.1016/j.carres.2022.108652] [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: 06/23/2022] [Revised: 08/18/2022] [Accepted: 08/18/2022] [Indexed: 11/02/2022]
Abstract
In this note, supercritical fluid chromatography coupled to high-resolution mass spectrometry (SFC-HRMS) has been used to identify a chloro glycoside formed during the preparation of propargyl 1,2-orthoesters in dichloromethane. Additional studies revealed that 20-40% of this side-product was obtained depending on the source of anhydrous solvent, and that tetrabutylammonium iodide amplifies this side-reaction. Finally, a reliable procedure was developed in acetonitrile to prepare these glycosyl donors from perbenzoylated bromo glycosides in manno, gluco and galacto series in 63-74% yield.
Collapse
Affiliation(s)
- Nicolas Jouandon
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France
| | - Jana Hammoud
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France
| | - Alexandre Touron
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France
| | - Laetitia Bailly
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France
| | - Alexandra Le Foll
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France
| | - Antoine Y P Joosten
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France
| | - Thomas Lecourt
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA UMR 6014, 76000, Rouen, France.
| |
Collapse
|
23
|
Waqas M, Ahmed D, Qamar MT. Surfactant-mediated extraction of capsaicin from Capsicum annuum L. fruit in various solvents. Heliyon 2022; 8:e10273. [PMID: 36033307 PMCID: PMC9403339 DOI: 10.1016/j.heliyon.2022.e10273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 07/02/2022] [Accepted: 08/09/2022] [Indexed: 11/17/2022] Open
Abstract
Capsaicin is a valuable compound found in Capsicum annuum. The present study aimed to explore the efficiency of different solvents and surfactants on its extraction by maceration. Ethyl acetate was found to be the best solvent followed by dichloromethane and acetone, respectively. Overall order of efficiency of the solvents used was this: ethyl acetate > dichloromethane > acetone > glycerol > acetonitrile > methanol > acetic acid > toluene. Extractability of ethyl acetate for capsaicin remained unaffected by the surfactants. Tween-80 had very positive effect on the extraction efficiency of dichloromethane (DCM) and acetone. Kinetics of the extraction with the most efficient solvent ethyl acetate showed extraction of capsaicin to follow a pseudo-second order kinetic model. In conclusion, for extraction of capsaicin from green chili, ethyl acetate was the most powerful amongst the solvents used in the present work and tween-80 had a notable positive effect on the efficiency of DCM and acetone.
Collapse
Affiliation(s)
- Muhammad Waqas
- Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
| | - Dildar Ahmed
- Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
| | - Muhammad Tariq Qamar
- Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
| |
Collapse
|
24
|
Menacer R, Rekkab S, Kabouche Z. Fisetin and Robinetin antiradical activity under solvent effect: density functional theory study. J Mol Model 2022; 28:240. [PMID: 35913682 DOI: 10.1007/s00894-022-05223-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 07/13/2022] [Indexed: 10/16/2022]
Abstract
The structural and antioxidant activity of two flavonols, namely, Fisetin and Robinetin, have been investigated employing the density functional theory (DFT) using B3LYP functional and 6-311++G (d, p) basis set. The calculations were performed in the gas phase and under the solvent effect of water, dimethylsulfoxide (DMSO), methanol, and benzene. The Hydrogen-Atom Transfer (HAT), single Electron Transfer Followed by Proton Transfer (SET-PT), and sequential Proton Loss Electron Transfer (SPLET) mechanisms were investigated to rationalize the radical scavenging capacities and to identify the favored antioxidant mechanism. Hence, the bond dissociation enthalpies (BDE) ionization potential (IP), IE, proton dissociation enthalpy (PDE), proton affinity (PA), and electron Transfer enthalpy (ETE) related to each mechanism were reported and discussed in function of the solvent effect. For both flavonols, the results showed that 4'-OH hydroxyl is the preferred active site following the trend 4'-OH > 3'-OH > 3-OH > (5'-OH) > 7-OH. Besides, the HAT mechanism is energetically the most favored pathway. The energetically favored solvents follow the trends water > DMSO > benzene > methanol and benzene > DMSO > methanol > water, for Fisetin and Robinetin, respectively.
Collapse
|
25
|
Feng JR, Deng QX, Ni HG. Photodegradation of phthalic acid esters under simulated sunlight: Mechanism, kinetics, and toxicity change. Chemosphere 2022; 299:134475. [PMID: 35381265 DOI: 10.1016/j.chemosphere.2022.134475] [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: 01/29/2022] [Revised: 03/26/2022] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
The photodegradation of two phthalic acid esters (PAEs), dimethyl phthalate (DMP) and di-n-octyl phthalate (DOP), under simulated sunlight in aqueous or organic phases (n-hexane (HEX) and dichloromethane (DCM)) was investigated. The mean photodegradation rates were ranked by half-lives as follows: DOP in DCM (3.77 h) < DMP in DCM (9.62 h) < DOP in H2O (3.99 days) < DMP in H2O (19.2 days) < DOP in HEX (21.0 days) < DMP in HEX (>30 days). Compound-specific stable isotope analysis (CSIA) combined with intermediate analysis was employed to explore the involved initial photoreaction mechanism. C-O bond cleavage, chlorine radical adduction to the aromatic ring, competing reactions of chlorine radical adduction to the aromatic ring and side chain, and a singlet oxygen-mediated pathway were mainly responsible for initial photodegradation mechanism of PAEs in H2O, DMP in DCM, DOP in DCM, and DOP in HEX, respectively. Furthermore, distinct isotope fractionation patterns of PAEs photodegradation open the possibility of using CSIA to differentiate the involved solvents in the field. More toxic and recalcitrant intermediates emerged during the photodegradation of DMP in DCM, while the risk to human health was reduced during the photochemical transformation of DOP in organic solvents.
Collapse
Affiliation(s)
- Jin-Ru Feng
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Qing-Xin Deng
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Hong-Gang Ni
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
| |
Collapse
|
26
|
Biral Silva C, Cesar Torres Antonio F, Homem-de-Mello P, Orzari Ribeiro A, Batista do Nascimento F, de Oliveira HPM. Photochemical and photophysical properties of tetracarboxylic acid phthalocyanines from glycolic and lactic acids in homogeneous and micro heterogeneous media. Spectrochim Acta A Mol Biomol Spectrosc 2021; 263:120177. [PMID: 34340053 DOI: 10.1016/j.saa.2021.120177] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 07/03/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Glycolic acid and lactic acid substituted zinc phthalocyanines were studied concerning their photophysical and photochemical properties in eight organic solvents (homogeneous medium) and in aqueous media with the presence of CTAB and PVP 360 surfactants. Solvent effects were investigated according to several physical solvent parameters, including studies that used more than one parameter at a time, such as the ET(30) scale and the Lippet-Mataga equation. Computational studies were realized and was found in good agreement with experimental data indicating J-type dimers' formation through hydrogen bonds, which may not affect the spectroscopic properties. Fluorescence lifetimes were recorded using a time-correlated single-photon counting setup (TCSPC) technique. The direct method (analyzing the phosphorescence decay curves of singlet oxygen at 1270 nm) was employed to study singlet oxygen quantum yields. Phthalocyanine macrocycle with lactic acid substituent showed better solvation arrangement than the glycolic derivative, which can be explained based on the presence of the methyl group bonded to the chain. The water solvation of Pc's in the presence of cationic surfactant (CTAB) and biocompatible polymer PVP 360 increses the importance of this study for appliance in photodynamic therapy (PDT).
Collapse
Affiliation(s)
- Charles Biral Silva
- Federal University of ABC/Center for Natural and Human Sciences, Av. dos Estados, 5001 - Santo André, São Paulo CEP 09210-580, Brazil
| | - Felipe Cesar Torres Antonio
- Federal University of ABC/Center for Natural and Human Sciences, Av. dos Estados, 5001 - Santo André, São Paulo CEP 09210-580, Brazil
| | - Paula Homem-de-Mello
- Federal University of ABC/Center for Natural and Human Sciences, Av. dos Estados, 5001 - Santo André, São Paulo CEP 09210-580, Brazil
| | - Anderson Orzari Ribeiro
- Federal University of ABC/Center for Natural and Human Sciences, Av. dos Estados, 5001 - Santo André, São Paulo CEP 09210-580, Brazil
| | - Francisco Batista do Nascimento
- Federal University of ABC/Center for Natural and Human Sciences, Av. dos Estados, 5001 - Santo André, São Paulo CEP 09210-580, Brazil
| | - Hueder Paulo Moisés de Oliveira
- Federal University of ABC/Center for Natural and Human Sciences, Av. dos Estados, 5001 - Santo André, São Paulo CEP 09210-580, Brazil.
| |
Collapse
|
27
|
Fameau AL, Ma Y, Siebenbuerger M, Bharti B. Foamitizer: High ethanol content foams using fatty acid crystalline particles. J Colloid Interface Sci 2021; 600:882-6. [PMID: 34062345 DOI: 10.1016/j.jcis.2021.05.076] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/12/2021] [Accepted: 05/13/2021] [Indexed: 11/20/2022]
Abstract
Aqueous foams are encountered in many commercial products used in our everyday lives and are widely studied. However, the formation and stabilization of foams using high alcohol content (>75%) solvents such as ethanol is still a scientific challenge. Herein, we report for the first-time foams based on high ethanol content showing long-term stability by using natural fatty acid crystals. The platelet-shape crystals are adsorbed at the air-water surface protecting the bubbles against coalescence. The melting of crystals triggers the foam destabilization leading to thermostimulable high ethanol content foams. These foams can be used as a new formulation strategy for alcohol-based hand sanitizers to better clean hands, protect the skin by the presence of fatty acids, and limit the transmission of virus and other pathogens.
Collapse
|
28
|
Ahn J, Avonto C, Chittiboyina AG, Khan IA. Solvents effect on dansyl cysteamine depletion and reactivity classification of skin sensitizers: Tackling the challenges using binary solvent systems. J Pharmacol Toxicol Methods 2021; 112:107116. [PMID: 34403747 DOI: 10.1016/j.vascn.2021.107116] [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: 03/26/2021] [Revised: 07/07/2021] [Accepted: 08/11/2021] [Indexed: 10/20/2022]
Abstract
The high throughput method using dansyl cysteamine (HTS-DCYA™) is a sensitive and rapid in chemico approach to characterize skin sensitizers' thio-reactivity. The direct quantification of fluorescent hapten-DCYA adducts facilitates the rapid testing of pure chemicals as well as mixtures. Poor solubility in acetonitrile was occasionally observed and can represent a limitation. To enable the range of solvent options compatible with the testing, the effect of binary solvent systems on thio-reactivity and the HTS-DCYA classification was explored. The method's robustness was validated using five different solvent modifiers: water, DMSO, methanol, ethanol, and tetrahydrofuran. Some modifiers, viz., water and methanol, resulted in unexpected DCYA depletion, negatively affecting the thio-reactivity and classification of potential sensitizers. This undesirable, non-specific depletion was circumvented by optimizing the original HTS-DCYA™ method's workflow, resulting in a more robust and reliable thio-reactivity and hence classification with a binary solvent system. The results were validated for both pure compounds and plant extracts as examples of complex test samples. Based on the obtained results, the modified HTS-DCYA optimal conditions in the various solvent systems were established. Concentrations of modifiers up to 10% DMSO, 40% water, 40% EtOH, 60% MeOH, or 60% THF in acetonitrile were found acceptable for the modified protocol, with results comparable to the original method. The improved workflow with binary solvent systems provides significant advantages by expanding the applicability of the HTS-DCYA to a wider array of chemicals poorly soluble in acetonitrile.
Collapse
Affiliation(s)
- Jongmin Ahn
- National Center for Natural Products Research, The University of Mississippi, University, MS 38677, United States
| | - Cristina Avonto
- National Center for Natural Products Research, The University of Mississippi, University, MS 38677, United States.
| | - Amar G Chittiboyina
- National Center for Natural Products Research, The University of Mississippi, University, MS 38677, United States
| | - Ikhlas A Khan
- National Center for Natural Products Research, The University of Mississippi, University, MS 38677, United States; Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, The University of Mississippi, University, MS 38677, United States
| |
Collapse
|
29
|
Zou B, Xue J, Zhao Y, Zheng X. Effect of the weak intermolecular C-H···O=C hydrogen bonding, solvent polarity and concentration on the frequency of the C=O stretch mode of 2-thiophenecarboxaldehyde. Spectrochim Acta A Mol Biomol Spectrosc 2021; 255:119651. [PMID: 33765534 DOI: 10.1016/j.saa.2021.119651] [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] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 01/21/2021] [Accepted: 02/28/2021] [Indexed: 06/12/2023]
Abstract
The vibrational frequency shift in the C=O stretch mode of 2-thiophenecarboxaldehyde (2TC) in the condensed phase is still not fully understood. In this paper, the vibrational spectra of 2TC were investigated using the FT-Raman, FT-IR and resonance Raman spectroscopies in conjunction with the density functional theory calculation. The pure compound (in the neat liquid) exhibits three vibrational bands 1658, 1672 and 1687 cm-1 in the νC=O spectral region. It differs from the band pair 1672 and 1682 cm-1 for 2-cyclohexene-1-one (CHO) and the single band 1700 cm-1 for benzaldehyde. The relative intensities of observed bands vary with the polarity of aprotic solvents and the compound's concentration. In a diluted solution, the strongest band in the resonance Raman spectra of 2TC appears the C=O stretch mode at 1690 cm-1 in cyclohexane and 1674/1675 cm-1 in acetonitrile. The imparting factors that shift the C=O stretch mode frequency in the neat liquid and solvents with different polarities were examined. The spectral sources of the vibrational bands at 1658 and 1672 cm-1 in the neat liquid and a dilute solution were determined, and the resonance Raman spectra were assigned. It is concluded that tetramers and monomer are the major sources of the bands at 1658 and 1672 cm-1 in the neat liquid, respectively, while the monomer is the main source of the bands at 1674/1675 cm-1 in acetonitrile and the band at 1690 cm-1 in cyclohexane with a dilute concentration. The band's source at 1662/1663 cm-1 in acetonitrile (a dilute concentration) can be either the dimers or 2TC-CH3CN clusters. The C=O bond's electronic charge density is the main factor that shifts the vibrational frequency of the C=O stretch mode of 2TC monomer when an aprotic solvent is used. The larger the polarity of an aprotic solvent, the more negative the electronic charge-density of the C=O bond for the monomer, the lower the frequency of the C=O stretch mode.
Collapse
Affiliation(s)
- Bangkun Zou
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| | - Jiadan Xue
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, PR China.
| | - Yanying Zhao
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| | - Xuming Zheng
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| |
Collapse
|
30
|
Kimura M, Ito T, Sato H, Higashi M. Theoretical study on isomerization of α-acids: A DFT calculation. Food Chem 2021; 364:130418. [PMID: 34192634 DOI: 10.1016/j.foodchem.2021.130418] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 05/24/2021] [Accepted: 06/17/2021] [Indexed: 11/17/2022]
Abstract
The α-acids contained in hops are one of the ingredients of beer. The isomerization of α-acids produces iso-α-acids, the main source of bitterness in beer. In this study, the isomerization mechanism of the α-acid, cohumulone, was elucidated by using density functional theory in conjunction with the polarizable continuum model or 3D-RISM integral equation theory of liquids. The calculated reaction diagram is consistent with experimental results; the activation free energy difference between the cis and trans isomers is in good agreement with the experimental estimate. The activation energy difference results from solvation energy. Additionally, a calculation of NMR chemical shifts showed that the proton position of isocohumulone is different from that proposed previously. The effect of Mg2+ cation on the isomerization was also investigated. Both the activation and reaction free energy are stabilized by the presence of Mg2+, which is consistent with experimental results. Water solvation reduces the activation free energy.
Collapse
Affiliation(s)
- Minami Kimura
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Tadashi Ito
- Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
| | - Hirofumi Sato
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan; Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan; Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Masahiro Higashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan; Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan.
| |
Collapse
|
31
|
Arumugam M, Yu Y, Jung HJ, Yeon S, Lee H, Theerthagiri J, Lee SJ, Choi MY. Solvent-mediated synthesis of BiOI with a tunable surface structure for effective visible light active photocatalytic removal of Cr(VI) from wastewater. Environ Res 2021; 197:111080. [PMID: 33775677 DOI: 10.1016/j.envres.2021.111080] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [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: 02/20/2021] [Revised: 03/15/2021] [Accepted: 03/19/2021] [Indexed: 06/12/2023]
Abstract
The present study investigated the effect of various solvents on the tunable surface morphology and photocatalytic activity (PCA) of bismuth oxyiodide (BiOI), which could be used for the reduction of Cr(VI) under visible light irradiation (VLI). BiOI samples exhibiting different morphologies, i.e., two-dimensional square-like nanosheet and three-dimensional hierarchical flower-like morphology, were synthesized by a hydro/solvothermal process using different solvents, namely H2O, MeOH, EtOH, and ethylene glycol (EG). The crystal structure, surface morphology, surface area, light-absorption capability, and recombination rate of the photogenerated charge carriers were examined by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence, and transient photocurrent analyses, respectively. The BiOI sample fabricated in EG showed excellent photocatalytic efficiency (~99%) for the reduction of Cr(VI) after 90 min under VLI. The enhanced PCA demonstrated that the high surface area and well-structured surface characteristics of flower-like 3D BiOI microspheres played important roles in the photoreduction process. Moreover, a plausible mechanism for the reduction of Cr(VI) over the EG-BiOI photocatalyst was proposed. The results of the PCA evaluation and recycle test revealed that 3D EG-BiOI microspheres could serve as promising materials for the efficient removal of Cr(VI) from wastewater. Additionally, EG-BiOI could be utilized in other environmental remediation processes.
Collapse
Affiliation(s)
- Malathi Arumugam
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Yiseul Yu
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Hyeon Jin Jung
- Nano Materials & Nano Technology Center, Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology, Jinju, 52851, Republic of Korea
| | - Sanghun Yeon
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Hyeyeon Lee
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Jayaraman Theerthagiri
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Seung Jun Lee
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea.
| | - Myong Yong Choi
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea.
| |
Collapse
|
32
|
Kang Q, Bao S, Chen B. Photoconversion of polychlorinated naphthalenes in organic solvents under simulated sunlight: Solvent effect and mechanism. Chemosphere 2021; 272:129887. [PMID: 33592517 DOI: 10.1016/j.chemosphere.2021.129887] [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: 10/30/2020] [Revised: 01/31/2021] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
In this work, the organic solvent effect on the photoconversion of polychlorinated naphthalenes (PCNs) under the simulated sunlight, as well as the mechanism and influence factor were studied. Eight organic solvents were selected to demonstrate the solvent effect on the photoconversion by the theoretical calculation method. It was found that the photoconversion rates of 1-chloronaphthalene (CN-1) in different organic solvents were in the order of dimethyl sulfoxide > methanol > acetonitrile > ethanol > dichloromethane > toluene > n-hexane > acetone. The result, obtained by the density functional theory (DFT) computation and the polarized continuum model (PCM) analysis in the framework of self-consistent reaction field (SCRF), indicated that the photoconversion was affected by the hydrogen-donating ability and electron-withdrawing potential of the solvents, as well as non-specific solute-solvent interactions. The photoconversion in acetonitrile for the five PCNs (1-chloronaphthalene, 2-chloronaphthalene, 2,3-dichloronaphthalene, 1,2,3,4-tetrachloronaphthalene, and 1,2,3,4,5,6,7,8- octachloronaphthalene) all fitted well with the first-order kinetic equation; and the reaction rate decreased with the increasing of number of chlorine atoms of the PCNs. Products analysis proved that the photoconversion process of PCNs went through two stages, namely the initial stage of dechlorination and the later stage of oxidative ring opening. It was found that inorganic ions (NO3-, Cl-, Fe3+, and Fe2+) promoted or inhibited the photoconversion by generating or quenching of the reactive oxygen species, and chlorophyll a promoted the photoconversion through the generation of singlet oxygen.
Collapse
Affiliation(s)
- Qiao Kang
- Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada
| | - Siqi Bao
- College of Environment and Resources, Jilin University, Changchun, 130012, China; School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, China.
| | - Bing Chen
- Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada.
| |
Collapse
|
33
|
Štrympl O, Vohlídal J, Hermannová M, Maldonado-Domínguez M, Brandejsová M, Kopecká K, Velebný V, Huerta-Ángeles G. Oleate-modified hyaluronan: Controlling the number and distribution of side chains by varying the reaction conditions. Carbohydr Polym 2021; 267:118197. [PMID: 34119164 DOI: 10.1016/j.carbpol.2021.118197] [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: 03/10/2021] [Revised: 05/11/2021] [Accepted: 05/11/2021] [Indexed: 11/27/2022]
Abstract
In this work, low molecular weight hyaluronan was chemically modified by oleoyl moieties utilising mixed anhydrides methodology. The activation of oleic acid with benzoyl chloride in organic solvents miscible with water was followed by NMR spectroscopy. The product selectivity correlates with the solvent's Hildebrand solubility parameter. Furthermore, the effect of the solvent for the mixed anhydride formation was elucidated by density functional theory (DFT) and showed that the reactions are faster in acetonitrile or alcohols than in hexane. Furthermore, the solvent demonstrated to control the substituent distribution pattern along HA chain during esterification. An even distribution of substituents was observed in reactions performed in water mixed with ethers. The substituent distribution pattern clearly influenced the aggregation behaviour of amphiphilic HA, controlling the stability of the delivery system, while increasing the encapsulation capacity.
Collapse
Affiliation(s)
- Ondřej Štrympl
- Contipro a.s., Dolni Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic; Charles University, Faculty of Science, Department of Physical and Macromolecular Chemistry, Hlavova 2030/8, 128 40 Prague 2, Czech Republic
| | - Jiří Vohlídal
- Charles University, Faculty of Science, Department of Physical and Macromolecular Chemistry, Hlavova 2030/8, 128 40 Prague 2, Czech Republic
| | | | - Mauricio Maldonado-Domínguez
- Department of Computational Chemistry, J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Prague, Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
| | | | - Kateřina Kopecká
- Contipro a.s., Dolni Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
| | - Vladimír Velebný
- Contipro a.s., Dolni Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
| | | |
Collapse
|
34
|
Begildayeva T, Lee SJ, Yu Y, Park J, Kim TH, Theerthagiri J, Ahn A, Jung HJ, Choi MY. Production of copper nanoparticles exhibiting various morphologies via pulsed laser ablation in different solvents and their catalytic activity for reduction of toxic nitroaromatic compounds. J Hazard Mater 2021; 409:124412. [PMID: 33187798 DOI: 10.1016/j.jhazmat.2020.124412] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/20/2020] [Accepted: 10/25/2020] [Indexed: 05/20/2023]
Abstract
Comparative experiments were conducted to determine the effects of various solvents (i.e., deionized water, methanol, ethanol, 1-propanol, butanol, ethylene glycol, hexane, and acetonitrile) on the final compositions, morphologies, and catalytic activities of copper-based nanoparticles (NPs). The NPs were effectively synthesized by pulsed laser ablation (PLA) using a copper plate as the target. The obtained copper NPs were characterized utilizing various analytical techniques. It was established that the developed methodology allows for the production of NPs with different morphologies and compositions in a safe and simple manner. When laser ablation of a solid copper plate was performed in acetonitrile, the formation of copper(I) cyanide cubes was observed. On the other hand, in deionized water and methanol, spherical and rod-like particles of copper(I) and copper(II) oxide were detected, respectively. The catalytic activity of the prepared copper NPs in the reduction of aromatic nitro compounds, such as 4-nitrophenol and nitrobenzene, was also evaluated. A high k value was determined for the reduction over the copper(II) oxide NPs produced in methanol. Moreover, particles with graphitic carbon (GC) layers exhibited superior catalytic performance in the reduction of a hydrophobic substance, i.e., nitrobenzene, over the reduction of 4-nitrophenol. The enhanced catalytic activity of this catalyst may be due its unique surface morphology and the synergistic effects between the copper nanostructure and the GC layer. Lastly, a detailed reduction pathway mechanism for the catalytic reduction of 4-nitrophenol and nitrobenzene has been proposed.
Collapse
Affiliation(s)
- Talshyn Begildayeva
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Seung Jun Lee
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Yiseul Yu
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Juhyeon Park
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Tae Ho Kim
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jayaraman Theerthagiri
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Ahreum Ahn
- Center for Supercomputing Applications, Korea Institute of Science and Technology Information, 245 Daehak-ro, Daejeon 34141, Republic of Korea
| | - Hyeon Jin Jung
- Nano Materials & Nano Technology Center, Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology, Jinju 52851, Republic of Korea
| | - Myong Yong Choi
- Department of Chemistry (BK21 FOUR) and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea.
| |
Collapse
|
35
|
Adam AMA, Saad HA, Alsuhaibani AM, Refat MS, Hegab MS. Charge-transfer chemistry of azithromycin, the antibiotic used worldwide to treat the coronavirus disease (COVID-19). Part I: Complexation with iodine in different solvents. J Mol Liq 2021; 325:115187. [PMID: 33390633 PMCID: PMC7764390 DOI: 10.1016/j.molliq.2020.115187] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [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: 10/19/2020] [Revised: 12/14/2020] [Accepted: 12/22/2020] [Indexed: 12/24/2022]
Abstract
Around the world, the antibiotic azithromycin (AZM) is currently being used to treat the coronavirus disease (COVID-19) in conjunction with hydroxychloroquine or chloroquine. Investigating the chemical and physical properties of compounds used alone or in combination to combat the COVID-19 pandemic is of vital and pressing importance. The purpose of this study was to characterize the charge transfer (CT) complexation of AZM with iodine in four different solvents: CH2Cl2, CHCl3, CCl4, and C6H5Cl. AZM reacted with iodine at a 1:1 M ratio (AZM to I2) in the CHCl3 solvent and a 1:2 M ratio in the other three solvents, as evidenced by data obtained from an elemental analysis of the solid CT products and spectrophotometric titration and Job's continuous variation method for the soluble CT products. Data obtained from UV-visible and Raman spectroscopies indicated that AZM strongly interacted with iodine in the CH2Cl2, CCl4, and C6H5Cl solvents by a physically potent n→σ* interaction to produce a tri-iodide complex formulated as [AZM·I+]I3 -. XRD and TEM analyses revealed that, in all solvents, the AZM-I2 complex possessed an amorphous structure composed of spherical particles ranging from 80 to 110 nm that tended to aggregate into clusters. The findings described in the present study will hopefully contribute to optimizing the treatment protocols for COVID-19.
Collapse
Affiliation(s)
- Abdel Majid A Adam
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Hosam A Saad
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Amnah M Alsuhaibani
- Department of Physical Sport Science, Princess Nourah bint Abdulrahman University, 4545 - King Khalid Airport Unit No. 1, Riyadh 13415-7132, Saudi Arabia
| | - Moamen S Refat
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohamed S Hegab
- Deanship of Supportive Studies (D.S.S.), Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| |
Collapse
|
36
|
Sayqal A, Ahmed SA, Hussein EM, Kassem MA. Development a spectrofluorometric micellar supported encapsulated method for micro determination of silver ion using new 2,6-disubstituted pyridine derivatives. Spectrochim Acta A Mol Biomol Spectrosc 2020; 242:118711. [PMID: 32738759 DOI: 10.1016/j.saa.2020.118711] [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] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 07/03/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
Herein, the presented manuscript provides for an extensive spectrofluorimetric method for micro determination of silver ion. This established method based on the use of the three synthesized 2,6-disubstituted pyridine derivatives (R1, R2 and R3) through exploiting their high fluorescence emission property. A noticeable effect on the fluorescence emission of the reagents after chelation with Ag (I) was monitored. Its noteworthy that the sensitivity and stability of this method was increased by using micellar medium. After chelation with Ag(I), the fluorescence emission of the ligands R1 and R2 were effectively quenched in a regular manner by increasing Ag(I) concentration. In contrast, an increase of the fluorescence intensity for reagent R3 after addition of Ag (I) was observed. The solvatochromism for all reagents under investigation was examined in different solvent. Furthermore, the chelation between Ag(I) and the and designed pyridine reagents was assessed spectrophotometrically. The optimum conditions for the most stable complexes which give a high signal difference were explored and well-determined. The linear range for determination of silver ion were determined and found to be 0.18-1.16, 0.06-0.59 and 0.18-1.43 μg mL-1 for R1, R2 and R3, respectively. The statistical analytical parameters such as LOD, LOQ, SD of slope, SD of intercept and RDS were calculated. In addition, the developed methods were efficaciously applied for determination of Ag(I) in some water samples. These selective complexation methods found to be in good precision compared to official and reported method as revealed F-test.
Collapse
Affiliation(s)
- Ali Sayqal
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, 21955 Makkah, Saudi Arabia
| | - Saleh A Ahmed
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, 21955 Makkah, Saudi Arabia; Chemistry Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt.
| | - Essam M Hussein
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, 21955 Makkah, Saudi Arabia; Chemistry Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt
| | - Mohammed A Kassem
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, 21955 Makkah, Saudi Arabia; Chemistry Department, Faculty of Science, Benha University, 13518 Benha, Egypt.
| |
Collapse
|
37
|
Ma YL, Sun P, Feng J, Yuan J, Wang Y, Shang YF, Niu XL, Yang SH, Wei ZJ. Solvent effect on phenolics and antioxidant activity of Huangshan Gongju (Dendranthema morifolium (Ramat) Tzvel. cv. Gongju) extract. Food Chem Toxicol 2020; 147:111875. [PMID: 33227389 DOI: 10.1016/j.fct.2020.111875] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 09/25/2020] [Revised: 10/29/2020] [Accepted: 11/17/2020] [Indexed: 02/06/2023]
Abstract
Huangshan Gongju was extracted with organic solvents (ethanol, methanol and acetone) of different concentrations (0-90%), and the extracts' phenolic content and antioxidant activity, as well as the correlations between them were examined. With the increasing concentration of organic solvent, the total phenolic compound (TPC) increased continuously and met its maximum at 70% acetone, whereas the total flavonoid compound (TFC) and most individual phenolics met their maximums at 70% ethanol. Similar changes occurred to the antioxidant activity, including DPPH and ABTS scavenging activities, and their maximums were respectively found at 50% acetone and 70% ethanol. The antioxidant activity correlated strongly with TPC/TFC (r > 0.954, p < 0.01) and individual phenolics (r > 0.886, p < 0.05), and the strongest correlations between them were mainly given by luteolin-7-O-glucoside (r > 0.975, p < 0.001). These results suggested that high content organic solvent (50-70%) was beneficial to obtain Huangshan Gongju extracts of higher phenolic content and antioxidant activity, and 70% ethanol may be the promising solvent. Besides, phenolics were found to be the main antioxidants of Huangshan Gongju extracts, and flavonoids especially luteolin-7-O-glucoside may play more important roles in the antioxidant activity.
Collapse
Affiliation(s)
- Yi-Long Ma
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China; School of Biological Science and Engineering, North Minzu University, Yinchuan, 750021, China.
| | - Ping Sun
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Jun Feng
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Jia Yuan
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Yue Wang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Ya-Fang Shang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China; School of Biological Science and Engineering, North Minzu University, Yinchuan, 750021, China.
| | - Xiang-Li Niu
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Shao-Hua Yang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Zhao-Jun Wei
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China; School of Biological Science and Engineering, North Minzu University, Yinchuan, 750021, China.
| |
Collapse
|
38
|
Niu J, Liu H, Zhang Y, Wang X, Han J, Yue Z, Duan E. NiCo 2O 4 spinel for efficient toluene oxidation: The effect of crystal plane and solvent. Chemosphere 2020; 259:127427. [PMID: 32599385 DOI: 10.1016/j.chemosphere.2020.127427] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 04/30/2020] [Accepted: 06/14/2020] [Indexed: 06/11/2023]
Abstract
Spinel oxides, e.g., NiCo2O4, is a promising catalyst for the catalytic oxidation of toluene. Understanding and designing versatile NiCo2O4 spinel is important for low-temperature toluene oxidation. Here, we investigated the surface-characteristic-dependent degradation activity of NiCo2O4 crystals through experiment and characterization. NiCo2O4 nanosheet using ethanol as solvent (named E--NiCo2O4) exposing {110} crystal planes exhibited the lowest temperature toluene oxidation. The T99 of toluene conversion was 256 °C, which is much lower than that of NiCo2O4 nanosheet using ethylene glycol as solvent (named EG--NiCo2O4), NiCo2O4 octahedron (named O--NiCo2O4) and NiCo2O4 truncated octahedron (named TO--NiCo2O4). Characterization using various techniques such as XRD, TEM, BET, XPS, H2-TPR and CO2-TPD showed that Co3+ and surface adsorbed oxygen (Osur) enriched surface, excellent redox properties and effective diffusion of the reaction product reasonably explain the enhancement in catalytic activity over the E--NiCo2O4. The research reveals that the effect of specific crystal planes and solvent was the key factor to govern the activity of low-temperature toluene oxidation.
Collapse
Affiliation(s)
- Jianrui Niu
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, Hebei, 050018, PR China.
| | - Haobin Liu
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, Hebei, 050018, PR China; Hebei Synergy Environmental Technology Co., Ltd., Shijiazhuang, Hebei, 050099, People's Republic of China.
| | - Yiyuan Zhang
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, Hebei, 050018, PR China.
| | - Xin Wang
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, Hebei, 050018, PR China.
| | - Jing Han
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, Hebei, 050018, PR China.
| | - Zihan Yue
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China.
| | - Erhong Duan
- Pollution Prevention Biotechnology Laboratory of Hebei Province and School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, People's Republic of China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, Hebei, 050018, PR China.
| |
Collapse
|
39
|
Sarmah P. DFT-based reactivity and QSPR studies of platinum (IV) anticancer drugs. J Mol Graph Model 2020; 100:107682. [PMID: 32739639 DOI: 10.1016/j.jmgm.2020.107682] [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: 05/11/2020] [Revised: 07/02/2020] [Accepted: 07/02/2020] [Indexed: 11/17/2022]
Abstract
In the present work the influence of different axial ligands on reactivity of some selected Pt(IV) complexes with anticancer activities are investigated in both gas and solvent phases using Density Functional Theory (DFT) calculations. Calculated geometries of the complexes are in good agreement with their available X-ray data. The reactivity descriptors such as hardness, chemical potential and electrophilicity are calculated to measure stability and reactive nature of the complexes. It has been interesting to observe that the increase in the number of carbon chain of carboxylato axial ligand has no influence on reactivity of Pt(IV) complexes. Multiple linear regression analyses are performed to build Quantitative Structure Property Relationship (QSPR) models using DFT and molecular mechanics (MM+) based descriptors in gas and solvent phases. Chemical potential is found to be the most significant single descriptor to measure reduction potential of Pt(IV) complexes giving 87% correlation with experimental data. While gas phase derived descriptors are not statistically significant, inclusion of solvent medium increases the correlation of each descriptor with reduction potential and hydrophobicity of the complexes.
Collapse
Affiliation(s)
- Pubalee Sarmah
- Department of Chemistry, Royal Global University, Betkuchi, Guwahati, 781035, Assam, India.
| |
Collapse
|
40
|
Valdéz-Camacho JR, Ramírez-Solís A, Escalante J, Ruiz-Azuara L, Hô M. Theoretical determination of half-wave potentials for phenanthroline-, bipyridine-, acetylacetonate-, and glycinate-containing copper (II) complexes. J Mol Model 2020; 26:191. [PMID: 32617735 DOI: 10.1007/s00894-020-04453-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 06/21/2020] [Indexed: 11/30/2022]
Abstract
We report a protocol for the evaluation of theoretical half-wave potential (E1/2) using a set of 22 mixed chelate copper (II) complexes containing 1,10-phenanthroline and 2,2'-bipyridine derivatives as primary ligands, and acetylacetonate or glycinate as secondary ligands (formally from the Casiopeínas® family) for which accurate experimental values were determined in a 2/5 mixture of ethanol/water. We have calibrated the BP86, PBE, PBE0, B3LYP, M06-2X, and ω-B97XD functionals, using the Los Alamos LANL2DZ and Stuttgart-Köln SDDAll effective core potentials for the Cu and Fe atoms and the 6-311+G* basis set for the C, H, O, and N atoms. To address the solvent effects, we have saturated the first solvation shell with up to 9 water molecules for the explicit model and compared it with the Continuum Like-Polarizable Continuum Model (CPCM) implicit solvent scheme. We found that the PBE/LANL2DZ-6-311+G* protocol (with the CPCM implicit solvent scheme with an effective dielectric constant ε = 64.9121 for the 2/5 mixture of ethanol/water) yields the overall best performance. The theoretical values are compared with experimental data, three of which are reported here for the first time. We find good correlations between the theoretical and experimental E1/2 values for the 2,2'-bipyridine derivatives (R2 = 0.987, MAE = 86 mV) and 1,10-phenanthroline derivatives (R2 = 0.802, MAE = 58.4 mV). The correlation trends have been explained in terms of the copper atom's ability to be reduced in the presence of the ligands. The Gibbs free energy differences at 298 K obtained for the redox reactions show that the more flexible secondary ligands (acetylacetonate) lead to larger entropic contributions which, as expected, increase the average MAE values as compared with the more rigid ligands (glycine). The present protocol yields lower MAEs as compared with previous approaches for similar mixed and flexible Cu(II) complexes.
Collapse
Affiliation(s)
- Jonathan Román Valdéz-Camacho
- Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico
| | - Alejandro Ramírez-Solís
- Centro de Investigación en Ciencias-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico
| | - Jaime Escalante
- Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico
| | - Lena Ruiz-Azuara
- Facultad de Química, Departamento de Química Inorgánica y Nuclear, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510, México, DF, Mexico
| | - Minhhuy Hô
- Centro de Investigaciones Químicas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico.
| |
Collapse
|
41
|
Wang T, Xie HB, Song Z, Niu J, Chen DL, Xia D, Chen J. Role of hydrogen bond capacity of solvents in reactions of amines with CO 2: A computational study. J Environ Sci (China) 2020; 91:271-278. [PMID: 32172976 DOI: 10.1016/j.jes.2020.01.019] [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: 09/15/2019] [Revised: 01/15/2020] [Accepted: 01/21/2020] [Indexed: 06/10/2023]
Abstract
Various computational methods were employed to investigate the zwitterion formation, a critical step for the reaction of monoethanolamine with CO2, in five solvents (water, monoethanolamine, propylamine, methanol and chloroform) to probe the effect of hydrogen bond capacity of solvents on the reaction of amine with CO2 occurring in the amine-based CO2 capture process. The results indicate that the zwitterion can be formed in all considered solvents except chloroform. For two pairs of solvents (methanol and monoethanolamine, propylamine and chloroform) with similar dielectric constant but different hydrogen bond capacity, the solvents with higher hydrogen bond capacity (monoethanolamine and propylamine) facilitate the zwitterion formation. More importantly, kinetics parameters such as activation free energy for the zwitterion formation are more relevant to the hydrogen bond capacity than to dielectric constant of the considered solvents, clarifying the hydrogen bond capacity could be more important than dielectric constant in determining the kinetics of monoethanolamine with CO2.
Collapse
Affiliation(s)
- Tingting Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Hong-Bin Xie
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
| | - Zhiquan Song
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Junfeng Niu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - De-Li Chen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China
| | - Deming Xia
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Jingwen Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| |
Collapse
|
42
|
Dai Y, Jin R, Verpoorte R, Lam W, Cheng YC, Xiao Y, Xu J, Zhang L, Qin XM, Chen S. Natural deep eutectic characteristics of honey improve the bioactivity and safety of traditional medicines. J Ethnopharmacol 2020; 250:112460. [PMID: 31837415 DOI: 10.1016/j.jep.2019.112460] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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: 07/22/2019] [Revised: 11/20/2019] [Accepted: 12/05/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Honey, an important additive with natural deep eutectic solvent (NADES) characteristics, has been used in traditional medicine for thousands of years. AIM OF THE STUDY We investigated the quality-improving effects of honey on Astragali Radix (Mikvetch Root) (RA) as an example. MATERIALS AND METHODS Decoctions of raw RA, fried RA, honey-fried RA, and a man-made- honey-fried RA were prepared and compared in cell-based bioactivity tests, chemical composition tests, as well as a bioavailability test with calycosin-7-O-β-D-glucoside. RESULTS The addition of honey increased the concentrations of active compounds and their oral bioavailability, provided protection against acetylation, and consequently increased their bioactivity. These changes were also observed when a pure NADES-mimicking honey was used. CONCLUSION Our findings provide a potential explanation as to why honey has long been used as traditional medicine additives and rationalize the application of honey and honey-like substance in producing pharmaceuticals.
Collapse
Affiliation(s)
- Yuntao Dai
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Nanxiaojie 16, Dongzhimennei Ave, 100700, Beijing, China.
| | - Runa Jin
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Nanxiaojie 16, Dongzhimennei Ave, 100700, Beijing, China
| | - Robert Verpoorte
- Natural Products Laboratory, Institute of Biology, Leiden University, Sylviusweg 72, 2333BE, Leiden, the Netherlands
| | - Wing Lam
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, 06510, CT, United States
| | - Yung-Chi Cheng
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, 06510, CT, United States
| | - Yongqin Xiao
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Nanxiaojie 16, Dongzhimennei Ave, 100700, Beijing, China
| | - Jiang Xu
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Nanxiaojie 16, Dongzhimennei Ave, 100700, Beijing, China
| | - Liwei Zhang
- Institute of Molecule Science, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Shanxi University, Wucheng Road 96, 030006, Taiyuan, China
| | - Xue-Mei Qin
- China Modern Research Center for Traditional Chinese Medicine of Shanxi University, Shanxi University, Wucheng Road 96, 030006, Taiyuan, China
| | - Shilin Chen
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Nanxiaojie 16, Dongzhimennei Ave, 100700, Beijing, China
| |
Collapse
|
43
|
Shiroudi A, Safaei Z, Kazeminejad Z, Repo E, Pourshamsian K. DFT study on tautomerism and natural bond orbital analysis of 4-substituted 1,2,4-triazole and its derivatives: solvation and substituent effects. J Mol Model 2020; 26:57. [PMID: 32055990 DOI: 10.1007/s00894-020-4316-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 01/30/2020] [Indexed: 10/25/2022]
Abstract
Density functional theory investigations at the DFT-B3LYP/6-311++G** theoretical level employed to determine the tautomerism, substituent effects of 4-substituted 4-amino-5-methyl-2,4-dihydro-3H-1,2,4-triazole-3-thione, and its derivatives (4-R-H, 4-R-CH3, 4-R-F, 4-R-NO2) in the selected solvent (acetone, acetonitrile, and dichloromethane) and gas phases using the polarizable continuum method (PCM) model. The substituted 1,2,4-triazoles have two main different tautomers namely N2-H and S7-H. For considered derivatives, thione forms are more energetically stable and dominant form in the studied solvent and gas phases. In addition, geometrical parameters, charges on atoms, dipole moments, energetic properties, and the nucleus-independent chemical shifts (NICS) are investigated. It has been seen that these molecular features of the studied compound and its derivatives are mostly solvent dependent. For electron-releasing and -withdrawing derivatives in the solution and gas phases, 2-H forms are the more stable and dominant form. The relative stability of the C4-substituted 1,2,4-triazole tautomerism is influenced by the possibility for intramolecular interactions between substituent and electron-donor or electron-acceptor centers of the triazole ring.
Collapse
|
44
|
Zhang X, Shi Y, Cai L, Zhou Y, Wang CK, Lin L. Solvent effect on the photophysical properties of thermally activated delayed fluorescence molecules. Spectrochim Acta A Mol Biomol Spectrosc 2020; 225:117473. [PMID: 31470345 DOI: 10.1016/j.saa.2019.117473] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/27/2019] [Accepted: 08/15/2019] [Indexed: 06/10/2023]
Abstract
As the third-generation organic electroluminescent materials, thermally activated delayed fluorescence (TADF) molecules have become the research focus recently. Significant solvent effect on TADF molecules were found experimentally, while theoretical investigations are quite limited. In this work, the solvent effect on photophysical properties of DCBPy and DTCBPy are investigated with first-principles calculations. The solvent polarity has slight influence on the molecular geometries and orbitals, while it can decrease the energy gap between the first singlet excited state (S1) and first triplet excited state (T1) significantly. Both the oscillator strength and the radiation rates of S1 increase with larger solvent polarity. The large energy gap between S1 and T1 induce negligible intersystem crossing (ISC) and reverse ISC rates between them, which also indicates higher triplet excited states are involved in the up-conversion process. Our results provide valuable information about solvent influence on the light-emitting properties of TADF molecules, which could help one better understand the light-emitting mechanism of them and favor the design of TADF molecules.
Collapse
Affiliation(s)
- Xiaotong Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Yurong Shi
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Lei Cai
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Yong Zhou
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Chuan-Kui Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China.
| | - Lili Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China.
| |
Collapse
|
45
|
Selvaraj S, Rajkumar P, Kesavan M, Thirunavukkarasu K, Gunasekaran S, Devi NS, Kumaresan S. Spectroscopic and structural investigations on modafinil by FT-IR, FT-Raman, NMR, UV-Vis and DFT methods. Spectrochim Acta A Mol Biomol Spectrosc 2020; 224:117449. [PMID: 31422339 DOI: 10.1016/j.saa.2019.117449] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 08/03/2019] [Accepted: 08/03/2019] [Indexed: 06/10/2023]
Abstract
Chiral sulfoxide based smart drug modafinil were studied experimentally and theoretically. Vibrational spectra were recorded in the mid IR region and electronic spectra were recorded in UV-Visible region. The molecular geometry, vibrational spectra, magnetic spectra and electronic spectra were simulated using Density Functional Theory (DFT) employed with B3LYP/6-311++G(d,p) basis set. The molecular geometry optimization, vibrational frequencies, chemical shifts and solvent effect on electronic properties were reported. The intermolecular interactions have been studied by Hirshfeld surface analysis. There is good agreement was found between calculated and observed values, thereby to confirm the molecular structure of modafinil.
Collapse
Affiliation(s)
- S Selvaraj
- Spectrophysics Research Laboratory, PG and Research Department of Physics, Arignar Anna Government Arts College, Cheyyar, 604407, Tamil Nadu, India; Department of Physics, Indo - American College, Cheyyar 604407, Tamil Nadu, India.
| | - P Rajkumar
- Spectrophysics Research Laboratory, PG and Research Department of Physics, Arignar Anna Government Arts College, Cheyyar, 604407, Tamil Nadu, India; PG and Research Department of Physics, King Nandhivarman College of Arts and Science, Thellar 604406, Tamil Nadu, India
| | - M Kesavan
- Interdisciplinary Institute of Indian System of Medicine, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - K Thirunavukkarasu
- Spectrophysics Research Laboratory, PG and Research Department of Physics, Arignar Anna Government Arts College, Cheyyar, 604407, Tamil Nadu, India
| | - S Gunasekaran
- Sophisticated Analytical Instrumentation Facility, St. Peter's Institute of Higher Education and Research, St. Peters University, Avadi, Chennai 600054, Tamil Nadu, India
| | - N Saradha Devi
- PG and Research Department of Chemistry, Arignar Anna Government Arts College, Cheyyar 604407, Tamil Nadu, India; Department of Chemistry, Annamalai University, Annamalai Nagar, Chidambaram 608002, Tamil Nadu, India
| | - S Kumaresan
- Spectrophysics Research Laboratory, PG and Research Department of Physics, Arignar Anna Government Arts College, Cheyyar, 604407, Tamil Nadu, India
| |
Collapse
|
46
|
Abstract
This chapter describes the current status of development of the fragment molecular orbital (FMO) method for analyzing the electronic state and intermolecular interactions of biomolecular systems in solvent. The orbital energies and the inter-fragment interaction energies (IFIEs) for a specific molecular structure can be obtained directly by performing FMO calculations by exposing water molecules and counterions around biomolecular systems. Then, it is necessary to pay attention to the thickness of the water shell surrounding the biomolecules. The single-point calculation for snapshots from MD trajectory does not incorporate the effects of temperature and configurational fluctuation, but the SCIFIE (statistically corrected IFIE) method is proposed as a many-body correlated method that partially compensates for this deficiency. Furthermore, implicit continuous dielectric models have been developed as effective approaches to incorporating the screening effect of the solvent in thermal equilibrium, and we illustrate their usefulness for theoretical evaluation of IFIEs and ligand-binding free energy on the basis of the FMO-PBSA (Poisson-Boltzmann surface area) method and other computational methods.
Collapse
|
47
|
Kaştaş G, Albayrak Kaştaş Ç, Tabak A. Investigation of molecular structure and solvent/temperature effect on tautomerism in (E)-4,6-dibromo-3-methoxy-2-[(p-tolylimino)methyl]phenol, a new thermochromic Schiff base, by using XRD, FT-IR, UV-vis, NMR and DFT methods. Spectrochim Acta A Mol Biomol Spectrosc 2019; 222:117198. [PMID: 31181503 DOI: 10.1016/j.saa.2019.117198] [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] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 04/28/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
The molecular structure and the solvent/temperature effect on the tautomerism in a new Schiff base, (E)-4,6-dibromo-3-methoxy-2-[(p-tolylimino)methyl]phenol, were investigated using spectroscopic (NMR, UV-vis, FT-IR), crystallographic (XRD), computational (DFT and TD-DFT) methods and harmonic oscillator model of aromaticity (HOMA). The XRD, DFT and FT-IR results show that the compound exists in the phenol-imine form in the solid state. HOMA indices support the aromatic structure of the compound. DFT calculations were performed to understand proton transfer process and relatively close values were obtained for the energies of tautomers. UV-vis studies prove the solvent dependence of the tautomerism in the compound by revealing the existence of both phenol-imine and keto-amine forms in polar solvents and only the phenol-imine form in apolar solvent. The TD-DFT results for the electronic transitions lead to the same conclusion as the absorption spectra. 1H NMR and 13C NMR studies at room and low (-60 °C) temperatures indicate that the tautomeric equilibrium occurs rapidly in the compound. Therefore, it is difficult to observe two tautomers. However, the presence of tautomeric structures is clearly seen in acetone‑d6, alternatively underlying the solvent and temperature dependence of tautomerism in the title compound.
Collapse
Affiliation(s)
- Gökhan Kaştaş
- Samsun University, Faculty of Aeronautics and Astronautics, Department of Aircraft Maintenance, Samsun, Turkey.
| | | | - Ahmet Tabak
- Sinop University, Faculty of Arts and Sciences, Department of Chemistry, Sinop, Turkey
| |
Collapse
|
48
|
Saed B, Sabzyan H. Quantum computational study of non-linear optical properties of some phenanthrene derivatives. Spectrochim Acta A Mol Biomol Spectrosc 2019; 222:117133. [PMID: 31226618 DOI: 10.1016/j.saa.2019.05.038] [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] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/22/2019] [Accepted: 05/13/2019] [Indexed: 06/09/2023]
Abstract
Non-linear optical (NLO) behavior of some phenanthrene-based organic molecules is studied using quantum computational MP2 and B3LYP methods with cc-pVDZ basis set. The design of these molecules is based on possible intramolecular charge transfer between electron donor and electron acceptor groups via an aromatic bridge. The -NO2, -CN, -CF3, -C(CF3)C(CF3)2, -SO3H and -C(CN)C(CN)2 acceptors and the -NH2, -N(CH3)2 and pyrrolidinyl donors have been considered. The HOMO and LUMO energies, polarizabilities and first hyperpolarizabilities are calculated for the optimized structures both in the gas phase and in the conductor-like polarizable continuum model (CPCM) of different solvents. Moreover, the energies of the vertical transitions in the UV-Vis range having large oscillator strengths and their corresponding adiabatic transition energies are calculated using TD-DFT-B3LYP/cc-pVDZ method. Also, UV-Vis and infrared spectra are simulated for these designed molecules. Results show that these phenanthrene derivatives have generally very good NLO behavior. Also, NLO properties are enhanced when (-C(CN)C(CN)2 & -NH2) and (-NO2 & pyrrolidinyl) pairs of (acceptor & donor) groups are used. The approach adopted in the present quantum computational study can be used for similar studies for better description and understanding of the NLO responses of the electron donor-bridge-acceptor systems with π-conjugated bridges.
Collapse
Affiliation(s)
- Behnaz Saed
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, I. R. Iran.
| | - Hassan Sabzyan
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, I. R. Iran.
| |
Collapse
|
49
|
Hazhazi H, Melkemi N, Salah T, Bouachrine M. DFT-based reactivity and combined QSAR, molecular docking of 1,2,4,5-Tetrazine derivatives as inhibitors of Pim-1 kinase. Heliyon 2019; 5:e02451. [PMID: 31687555 PMCID: PMC6819827 DOI: 10.1016/j.heliyon.2019.e02451] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 08/08/2019] [Accepted: 09/05/2019] [Indexed: 01/26/2023] Open
Abstract
In the present work we have calculated several DFT reactivity descriptors for 1,2,4,5-Tetrazine at the B3LYP/6–311++G(d,p) level of theory in order to analyze its reactivity in vacuum and solvent phases. Whereas, the influence of the solvent was taken into account employing the PCM model. DFT-based descriptors such as (electronic chemical potential, electrophilicity, condensed Fukui function….) have been determined to predict the reactivity of 1,2,4,5-Tetrazine. A series of eighteen 1,2,4,5-Tetrazine derivatives was studied by using two computational techniques, namely, quantitative structure activity relationship (QSAR) and molecular docking. QSAR models of the antitumor activity of some 1,2,4,5-Tetrazine derivatives were established in gas and solvent phases which exhibited good statistical values for both cases. Whereas, multiple linear regression (MLR) procedure was used to obtain the best QSAR models and the leave-one-out (LOO) method to estimate the predictivity of our models. The most and the least active compounds were docked with the protein (3C4E) to confirm those obtained results from QSAR models and elucidate the binding mode between this type of compounds and corresponding protein.
Collapse
Affiliation(s)
- Halima Hazhazi
- Group of Computational and Pharmaceutical Chemistry, Laboratory of Molecular Chemistry and Environment (LMCE), Department of Chemistry of Sciences, University of Biskra, 07000, Biskra, Algeria
| | - Nadjib Melkemi
- Group of Computational and Pharmaceutical Chemistry, Laboratory of Molecular Chemistry and Environment (LMCE), Department of Chemistry of Sciences, University of Biskra, 07000, Biskra, Algeria
| | - Toufik Salah
- Group of Computational and Pharmaceutical Chemistry, Laboratory of Molecular Chemistry and Environment (LMCE), Department of Chemistry of Sciences, University of Biskra, 07000, Biskra, Algeria
| | - Mohammed Bouachrine
- MCNS Laboratory, Faculty of Science, Moulay Ismail University of Meknes, Morocco.,MEM, LASMAR, Moulay Ismail University of Meknes, Morocco
| |
Collapse
|
50
|
Solanki J, Surati K. Heteroleptic Zn(II) Complexes: Synthesis, Characterization and Photoluminescence Properties. J Fluoresc 2019; 29:865-875. [PMID: 31325009 DOI: 10.1007/s10895-019-02397-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 03/23/2019] [Accepted: 05/28/2019] [Indexed: 10/26/2022]
Abstract
Heteroleptic Zn (II) complexes containing 8-hydroxy quinoline as preliminary ligand and pyrazolone based derivatives as secondary ligand were synthesized and their structures confirmed by NMR, Mass, FT-IR, UV-vis and Elemental analysis. Theses complexes show good photoluminescence properties in solid and solution state in the range of 505-544 nm with quantum yield 0.38 to 0.50. Whereas these complexes also show good life time in the range of 0.037 to 0.043 ms. These complexes show shift in the range of 25-30 nm. in different polar and nonpolar solvents due to intramolecular charge transfer (ICT). The bandgap of these complexes is around ~2.60 eV. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of all complexes are determine by cyclic voltammetry it obtained in the range of and ~ (-5.29 eV) and ~(-2.69 eV). The energy band gap, frontier molecular orbitals (FMO) energy levels and geometrical structures were optimized using density functional theory (DFT) with B3LYP/6-31G* basic set on Spartan'18 software. All complexes displayed high thermal stability. Graphical Abstract Donor-Bridge- Accepter (D-B-A) based Heteroleptic Zn(II) complexes for OLEDs application.
Collapse
Affiliation(s)
- Jaydip Solanki
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Anand, Gujarat, 388120, India
| | - Kiran Surati
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Anand, Gujarat, 388120, India.
| |
Collapse
|