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Soares IN, Peterson KA, de Souza GLC. Probing Antioxidant-Related Properties for Phenolic Compounds. J Phys Chem A 2024; 128:2727-2736. [PMID: 38538553 DOI: 10.1021/acs.jpca.3c08406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
In this work, properties related to antioxidant-potential mechanisms (such as the bond dissociation enthalpy, BDE, for the homolytic cleavage of the O-H bond and ionization energies, IEs) were determined for phenol, pyrocatechol, and gallic acid (GA). Both the protonated and deprotonated forms of GA were investigated. The Feller-Peterson-Dixon (FPD) composite method was employed with a variety of computational approaches, i.e., density functional theory, Möller-Plesset perturbation theory, and coupled-cluster-based methods, in combination with large correlation consistent basis sets with extrapolation to the complete basis set limit and consideration of core electron correlation effects. FPD results were compared to experimental and computational data available in the literature, presenting good agreement. For example, the FPD BDE (298 K) obtained for phenol, which was based on valence-correlated MP2/CBS calculations with contributions from correlating all electrons, was determined to be 87.56 kcal/mol, a value that is 0.42 kcal/mol lower than the result obtained in the most recent experiments, 87.98 ± 0.62. Calibration against coupled-cluster calculations was also carried out for phenol. We expect that the outcomes gathered here may help in establishing a general protocol for computational chemists that are interested in determining antioxidant-related properties for phenolic compounds with considerable accuracy as well as to motivate future IE measurements (particularly for GA) to be accomplished in the near future.
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Affiliation(s)
- Iuri N Soares
- Departamento de Química, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso 78060-900, Brazil
| | - Kirk A Peterson
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Gabriel L C de Souza
- Centro de Ciências da Natureza, Universidade Federal de São Carlos, Buri, São Paulo 18290-000, Brazil
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Vo QV, Thuy Hoa DT, Hoa NT, Tran MD, Mechler A. The radical scavenging activity of monocaffeoylquinic acids: the role of neighboring hydroxyl groups and pH levels. RSC Adv 2024; 14:4179-4187. [PMID: 38292262 PMCID: PMC10825902 DOI: 10.1039/d3ra08460d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/23/2024] [Indexed: 02/01/2024] Open
Abstract
Caffeoylquinic acids (CQAs) are well-known antioxidants. However, a key aspect of their radical scavenging activity - the mechanism of action - has not been addressed in detail thus far. Here we report on a computational study of the mechanism of activity of CQAs in scavenging hydroperoxyl radicals. In water at physiological pH, the CQAs demonstrated ≈ 104 times higher HOO˙ antiradical activity than in lipid medium (k(lipid) ≈ 104 M-1 s-1). The activity in the aqueous solution was determined by the hydrogen transfer mechanism of the adjacent hydroxyl group (O6'-H) of the dianion states (Γ = 93.2-95.2%), while the single electron transfer reaction of these species contributed 4.8-6.8% to the total rate constants. The kinetics estimated by the calculations are consistent with experimental findings in water (pH = 7.5), yielding a kcalculated/kexperimental = 2.4, reinforcing the reliability and precision of the computational method and demonstrating its utility for evaluating radical reactions in silico. The results also revealed the pH dependence of the HOO˙ scavenging activity of the CQAs; activity was comparable for all compounds below pH 3, however at higher pH values 5CQA reacted with the HOO˙ with lower activity than 3CQA or 4CQA. It was also found that CQAs are less active than Trolox below pH 4.7, however over pH 5.0 they showed higher activity than the reference. The CQAs had the best HOO˙ antiradical activity at pH values between 5.0 and 8.6. Therefore, in the physiological environment, the hydroperoxyl antiradical capacity of CQAs exhibits similarity to renowned natural antioxidants including resveratrol, ascorbic acid, and Trolox.
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Affiliation(s)
- Quan V Vo
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | - Duong Thi Thuy Hoa
- The University of Danang - University of Sciences and Education Danang 550000 Vietnam
| | - Nguyen Thi Hoa
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | - Manh Duc Tran
- The University of Danang - University of Sciences and Education Danang 550000 Vietnam
| | - Adam Mechler
- Department of Biochemistry and Chemistry, La Trobe University Victoria 3086 Australia
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3
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Fonseca S, Dos Santos NSS, Torres A, Siqueira M, da Cunha A, Manzoni V, Provasi PF, Gester R, Canuto S. Role of the Solvent and Intramolecular Hydrogen Bonds in the Antioxidative Mechanism of Prenylisoflavone from Leaves of Vatairea guianensis. J Phys Chem A 2023; 127:10807-10816. [PMID: 38108191 DOI: 10.1021/acs.jpca.3c05725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
This work discusses the electron structure, antioxidative properties, and solvent contribution of two new antioxidant molecules discovered, named S10 and S11, extracted from a medicinal plant called Vatairea guianensis, found in the Amazon rain-forest. To gain a better understanding, a study using density functional theory coupled with the polarizable-continuum model and the standard 6-311++G(d,p) basis set was conducted. The results indicate that S10 has a higher antioxidant potential than S11, confirming the experimental expectations. In the gas phase, the hydrogen atom transfer route dominates the hydrogen scavenging procedure. However, in the water solvents, the antioxidant mechanism prefers the sequential proton loss electron transfer mechanism. Furthermore, the solvent plays a fundamental role in the antioxidant mechanism. The formation of an intramolecular OH···OCH3 hydrogen bond is crucial for accurately describing the hydrogen scavenging phenomenon, better aligning with the experimental data. The results suggest that the two isoflavones investigated are promising for the pharmacologic and food industries.
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Affiliation(s)
- Sávio Fonseca
- Programa de Pós-Graduação em Química, Universidade Federal do Sul e Sudeste do Pará, Marabá, Pará 68507-590, Brazil
| | - Neidy S S Dos Santos
- Programa de Pós-Graduação em Química, Universidade Federal do Sul e Sudeste do Pará, Marabá, Pará 68507-590, Brazil
| | - Alberto Torres
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, São Paulo, São Paulo 05588-090, Brazil
| | - Marcelo Siqueira
- Curso de Física, Universidade Federal do Amapá, Ramal da UNIFAP, Macapá, Amapá 68903-329, Brazil
| | - Antônio da Cunha
- Universidade Federal do Maranhão, UFMA, Campus, Balsas, Maranhão CEP 65800-000, Brazil
| | - Vinícius Manzoni
- Instituto de Física, Universidade Federal de Alagoas, Maceió, Alagoas 57072-970, Brazil
| | - Patricio F Provasi
- Department of Physics, IMIT, Northeastern University, CONICET, AV. Libertad 5500, Corrientes W3404 AAS, Argentina
| | - Rodrigo Gester
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, São Paulo, São Paulo 05588-090, Brazil
- Faculdade de Física, Universidade Federal do Sul e Sudeste do Pará, Marabá, Pará 68507-590, Brazil
| | - Sylvio Canuto
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, São Paulo, São Paulo 05588-090, Brazil
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Ramírez-Velásquez I, Bedoya-Calle ÁH, Vélez E, Caro-Lopera FJ. Shape Theory Applied to Molecular Docking and Automatic Localization of Ligand Binding Pockets in Large Proteins. ACS OMEGA 2022; 7:45991-46002. [PMID: 36570297 PMCID: PMC9773186 DOI: 10.1021/acsomega.2c02227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 10/11/2022] [Indexed: 06/17/2023]
Abstract
Automatic search of cavities and binding mode analysis between a ligand and a 3D protein receptor are challenging problems in drug design or repositioning. We propose a solution based on a shape theory theorem for an invariant coupled system of ligand-protein. The theorem provides a matrix representation with the exact formulas to be implemented in an algorithm. The method involves the following results: (1) exact formulae for the shape coordinates of a located-rotated invariant coupled system; (2) a parameterized search based on a suitable domain of van der Waals radii; (3) a scoring function for the discrimination of sites by measuring the distance between two invariant coupled systems including the atomic mass; (4) a matrix representation of the Lennard-Jones potential type 6-12 and 6-10 as the punctuation function of the algorithm for a molecular docking; and (5) the optimal molecular docking as a solution of an optimization problem based on the exploration of an exhaustive set of rotations. We apply the method in the xanthine oxidase protein with the following ligands: hypoxanthine, febuxostat, and chlorogenic acid. The results show automatic cavity detection and molecular docking not assisted by experts with meaningful amino acid interactions. The method finds better affinities than the expert software for known published cavities.
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Affiliation(s)
- Iliana Ramírez-Velásquez
- Faculty
of Exact and Applied Sciences, Instituto
Tecnológico Metropolitano ITM, Cll. 73 # 76A-354, Medellín050034, Colombia
- Doctorate
in Modeling and Scientific Computing, Faculty of Basic Sciences, University of Medellin, Medellin050026, Colombia
| | - Álvaro H. Bedoya-Calle
- Faculty
of Basic Sciences, University of Medellin, Cra. 87 # 30-65, Medellín050026, Colombia
| | - Ederley Vélez
- Faculty
of Basic Sciences, University of Medellin, Cra. 87 # 30-65, Medellín050026, Colombia
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Tsuchida K, Okumura H, Ikarashi T, Takahashi Y. Chlorogenic acids protect organic dyes against self-catalyzed photobleaching. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mechanism of Antioxidant Activity of Betanin, Betanidin and Respective C15-Epimers via Shape Theory, Molecular Dynamics, Density Functional Theory and Infrared Spectroscopy. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27062003. [PMID: 35335368 PMCID: PMC8954076 DOI: 10.3390/molecules27062003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 12/16/2021] [Accepted: 12/21/2021] [Indexed: 11/16/2022]
Abstract
Betanin and betanidin are compounds with extensive interest; they are effectively free radical scavengers. The present work aims to elucidate the differences between the mechanism of the antioxidant activity of betanin, betanidin, and their respective C15-epimers. Shape Theory establishes comparisons between the molecules’ geometries and determines parallelisms with the descriptors BDE, PA, ETE IP, PDE, and infrared spectra (IR) obtained from the molecule simulations. Furthermore, the molecules were optimized using the B3LYP/6-31+G(d,p) protocol. Finally, the molecular docking technique analyzes the antioxidant activity of the compounds in the complex with the therapeutic target xanthine oxidase (XO), based on a new proposal for the geometrical arrangement of the ligand atoms in the framework of Shape Theory. The results obtained indicate that the SPLET mechanism is the most favorable in all the molecules studied and that the first group that loses the hydrogen atom in the four molecules is the C17COOH, presenting less PA the isobetanidin. Furthermore, regarding the molecular docking, the interactions of these compounds with the target were favorable, standing out to a greater extent the interactions of isobetanidin with XO, which were analyzed after applying molecular dynamics.
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Lomelí-Rosales DA, Zamudio-Ojeda A, Reyes-Maldonado OK, López-Reyes ME, Basulto-Padilla GC, Lopez-Naranjo EJ, Zuñiga-Mayo VM, Velázquez-Juárez G. Green Synthesis of Gold and Silver Nanoparticles Using Leaf Extract of Capsicum chinense Plant. Molecules 2022; 27:1692. [PMID: 35268794 PMCID: PMC8911899 DOI: 10.3390/molecules27051692] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/28/2022] [Accepted: 03/02/2022] [Indexed: 12/28/2022] Open
Abstract
So far, several studies have focused on the synthesis of metallic nanoparticles making use of extracts from the fruit of the plants from the genus Capsicum. However, as the fruit is the edible, and highly commercial, part of the plant, in this work we focused on the leaves, a part of the plant that is considered agro-industrial waste. The biological synthesis of gold (AuNPs) and silver (AgNPs) nanoparticles using aqueous extracts of root, stem and leaf of Capsicum chinense was evaluated, obtaining the best results with the leaf extract. Gold and silver nanoparticles synthesized using leaf extract (AuNPs-leaf and AgNPs-leaf, respectively) were characterized by UV-visible spectrophotometry (UV-Vis), Fourier Transform Infrared Spectroscopy with Attenuated Total Reflection (FTIR-ATR), X-ray Photoelectron Spectroscopy (XPS), Ultra Hight Resolution Scanning Electron Microscopy coupled to Energy-Dispersive X-ray spectroscopy (UHR-SEM-EDX) and Transmission Electron Microscopy (TEM), and tested for their antioxidant and antimicrobial activities. In addition, different metabolites involved in the synthesis of nanoparticles were analyzed. We found that by the use of extracts derived from the leaf, we could generate stable and easy to synthesize AuNPs and AgNPs. The AuNPs-leaf were synthesized using microwave radiation, while the AgNPs-leaf were synthesized using UV light radiation. The antioxidant activity of the extract, determined by ABTS, showed a decrease of 44.7% and 60.7% after the synthesis of the AuNPs-leaf and AgNPs-leaf, respectively. After the AgNPs-leaf synthesis, the concentration of polyphenols, reducing sugars and amino acids decreased by 15.4%, 38.7% and 46.8% in the leaf extract, respectively, while after the AuNPs-leaf synthesis only reducing sugars decreased by 67.7%. These results suggest that these groups of molecules are implicated in the reduction/stabilization of the nanoparticles. Although the contribution of these compounds in the synthesis of the AuNPs-leaf and the AgNPs-leaf was different. Finally, the AgNPs-leaf inhibited the growth of S. aureus, E. coli, S. marcescens and E. faecalis. All of them are bacterial strains of clinical importance due to their fast antibiotic resistance development.
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Affiliation(s)
- Diego Alberto Lomelí-Rosales
- Departamento de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán #1421, Guadalajara 44430, Jalisco, Mexico; (D.A.L.-R.); (O.K.R.-M.); (M.E.L.-R.); (G.C.B.-P.)
| | - Adalberto Zamudio-Ojeda
- Departamento de Física, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán #1421, Guadalajara 44430, Jalisco, Mexico;
| | - Oscar Kevin Reyes-Maldonado
- Departamento de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán #1421, Guadalajara 44430, Jalisco, Mexico; (D.A.L.-R.); (O.K.R.-M.); (M.E.L.-R.); (G.C.B.-P.)
| | - Morelia Eunice López-Reyes
- Departamento de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán #1421, Guadalajara 44430, Jalisco, Mexico; (D.A.L.-R.); (O.K.R.-M.); (M.E.L.-R.); (G.C.B.-P.)
| | - Georgina Cristina Basulto-Padilla
- Departamento de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán #1421, Guadalajara 44430, Jalisco, Mexico; (D.A.L.-R.); (O.K.R.-M.); (M.E.L.-R.); (G.C.B.-P.)
| | - Edgar José Lopez-Naranjo
- Departamento de Ingeniería de Proyectos, Universidad de Guadalajara, José Guadalupe Zuno # 48, Zapopan 45101, Jalisco, Mexico;
| | - Víctor Manuel Zuñiga-Mayo
- CONACyT-Instituto de Fitosanidad, Colegio de Postgraduados, Campus Montecillo, Texcoco 56230, Estado de México, Mexico
| | - Gilberto Velázquez-Juárez
- Departamento de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán #1421, Guadalajara 44430, Jalisco, Mexico; (D.A.L.-R.); (O.K.R.-M.); (M.E.L.-R.); (G.C.B.-P.)
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Antioxidant and cytotoxic activities of selected salicylidene imines: experimental and computational study. Mol Divers 2022; 26:3115-3128. [PMID: 35147861 DOI: 10.1007/s11030-021-10370-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 12/15/2021] [Indexed: 10/19/2022]
Abstract
Selected salicylidene imines were evaluated for their antioxidant and cytotoxic potentials. Several of them exerted potent scavenging capacity towards ABTS radical and hydrogen peroxide. The insight into the preferable antioxidative mechanism was reached employing density functional theory. In the absence of free radicals, the SPLET mechanism is dominant in polar surroundings, while HAT is prevailing in a non-polar environment. The results obtained for the reactions of the most active compounds with some medically relevant radicals pointed out competition between HAT and SPLET mechanisms. The assessment of their cytotoxic properties revealed inhibition of ER-a human breast adenocarcinoma cells or estrogen-independent prostate cancer cells. Molecular docking study with the cyclooxygenase (COX) 2 enzyme was performed to examine the most probable bioactive conformations and possible interactions between the tested derivatives and COX-2 binding pocket.
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Shang Y, Li X, Sun TY, Zhou J, Zhou H, Chen K. Comparative theoretical researches on the anti-oxidant activity of δ-viniferin and ε-viniferin. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Alvares JJ, Furtado IJ. Kinetics of DPPH• scavenging by bacterioruberin from Haloferax alexandrinus GUSF-1 (KF796625). J Anal Sci Technol 2021. [DOI: 10.1186/s40543-021-00293-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
AbstractThis is the first account of the kinetics of free radical scavenging by bacterioruberin obtained from cells of Haloferax alexandrinus GUSF-1(KF796625), grown at optimum conditions of 25% NaCl, pH 7, 42 °C, 150 rpm in NaCl Tryptone yeast extract medium and light. Bacterioruberin separated from methanolic extract displayed characteristics absorption peaks at 368, 386, 463, 492 and 525 nm and gave an m/z value of 740.4 (C50H76O4) in Liquid Chromatography-Mass Spectroscopy validating its purity. Bacterioruberin (13 µM) decolorized and decayed 0.2 mM 1,1-diphenyl-2-picrylhydrazyl radicals (DPPH•) monitored at 517 nm and reached a steady state within 30 min. An EC50 of 6.50 µM ± 0.27 (4.81 µg/mL ± 0.2) was deduced for the 0.2 mM DPPH•-bacterioruberin reaction using the GraphPad Prism 9 statistical software and employing the right-angled triangle technique. The study also revealed a comprehensive information of the total kinetic activity of bacterioruberin with DPPH•: the antioxidant activity index was 16.38 ± 0.67; time needed to reach the steady state with the added EC50—30 min; the antiradical power 30.77 ± 1.27 and the antiradical efficiency of 54.7 × 10–3 ± 2.24, thus reflecting the strong antioxidant nature of bacterioruberin. Scavenging of DPPH• by bacterioruberin was a pseudo-first-order reaction with a rate constant k2 of 2.76 × 10–5 ± 0.001 µM−1 s−1 calculated at t = 0 or initial time and t = 30 min. The knowledge of the kinetics of bacterioruberin to scavenge DPPH• adds to its effective application as an antioxidant in medicinal use, pharmaceutical products and others. Additionally, the use of simple conventional method of DPPH• free radical scavenging, monitored using an easily available laboratory spectrophotometer, will certainly help in the effective use of any antioxidant compound.
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Ácsová A, Hojerová J, Tobolková B, Martiniaková S. Antioxidant Efficacy of Natural Ubiquinol Compared to Synthetic References – In Vitro Study. ChemistrySelect 2021. [DOI: 10.1002/slct.202100315] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Aneta Ácsová
- Institute of Food Sciences and Technology Slovak University of Technology in Bratislava Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
| | - Jarmila Hojerová
- Institute of Food Sciences and Technology Slovak University of Technology in Bratislava Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
| | - Blanka Tobolková
- Department of Chemistry and Food Analysis National Agricultural and Food Centre – Food Research Institute Priemyselna 4, P. O. Box 25 824 75 Bratislava Slovakia
| | - Silvia Martiniaková
- Institute of Food Sciences and Technology Slovak University of Technology in Bratislava Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
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Catalytic and photocatalytic effects of TiO2 nanoparticles on electrooxidation of common antioxidants on carbon paste. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-021-04937-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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de Souza GLC, Peterson KA. Benchmarking Antioxidant-Related Properties for Gallic Acid through the Use of DFT, MP2, CCSD, and CCSD(T) Approaches. J Phys Chem A 2021; 125:198-208. [PMID: 33400511 DOI: 10.1021/acs.jpca.0c09116] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We present a benchmark investigation on the O-H bond dissociation enthalpies (BDEs) and ionization potential (IP) for gallic acid (GA), a widely known polyphenolic antioxidant. These properties were determined in the gas-phase and in water through the use of density functional theory (DFT), second-order Møller-Plesset perturbation theory (MP2), coupled-cluster with single and double excitations (CCSD), and coupled-cluster with single and double excitations as well as perturbative inclusion of triples (CCSD(T)). The 6-311++G(df,p), cc-pVDZ, aug-cc-pVDZ, cc-pVTZ, and aug-cc-pVTZ basis sets were used. Regarding DFT functionals, the M06-2X provided the best agreement for the BDEs when compared to the corresponding CCSD(T)/aug-cc-pVTZ results; M06-2X was also found to be the most suitable for probing the IP for the protonated forms of GA while LC-ωPBE was the most reliable in the case of deprotonated GA. Given that these properties represent important descriptors for examining mechanisms related to the antioxidant potential of a given polyphenol, we hope that the present work can serve as a guide for computational chemists venturing in the field.
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Affiliation(s)
- Gabriel L C de Souza
- Departamento de Química, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso 78060-900, Brazil.,Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Kirk A Peterson
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
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Son NT, Thuy PT, Van Trang N. Antioxidative capacities of stilbenoid Suaveolensone A and Flavonoid Suaveolensone B: A detailed analysis of structural-electronic properties and mechanisms. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129025] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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15
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Ahmed F. Nutraceutical potential of molokhia ( Corchorus olitorius l.): A versatile green leafy vegetable. Pharmacognosy Res 2021. [DOI: 10.4103/pr.pr_100_20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Kumar CRS, Jha A, Deepthi S. DFT Studies of Distinct Anilines with p-Hydroxycinnamic Acids for Antioxidant Profile. Med Chem 2020; 17:60-70. [PMID: 32370721 DOI: 10.2174/1573406416666200506085152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Revised: 03/09/2020] [Accepted: 03/10/2020] [Indexed: 01/23/2023]
Abstract
BACKGROUND Life style and jobs in current situations have generated increased free radicals such as hydroxyl (OH•) and superoxide (O2•) radicals, thereby increasing stress in humans. Interest in search of antioxidants that trap these free radicals has increased to relieve stress. β-carotene (provitamin A), ascorbic acid (vitamin C), tocopherol or vitamin E, Trolox; butyl hydroxy toluene and phenolic compounds are the well-known antioxidants. Several methods evaluate the antioxidant property existing in natural substances (medicinal plants and agri-food products) and synthetic compounds (2-methyl-3- (pyrrolidin-2-ylideneamino) quinazolin-4 (3H) -one and 3,3'- (1,4- phenylenebis (methanylylidene)) bis (azanylylidene) (2-methyl-quinazolin-4 (3H) -one). OBJECTIVE The objective of this study is to focus on complexes with p-hydroxycinnamic acids to trap free radicals in a greener way. METHODS Spectroscopic shifts and structural studies were employed to attribute electronic properties responsible for antioxidant profile. Spectroscopic shifts in wavenumbers were attributed with Fourier Transform Infrared Spectra (FTIR) and Fourier Transform Raman spectra (FT Raman Spectra). Structural studies were performed with Gaussian package, electron density method the B3LYP method, basis set 6-31(d) for attributing electronic properties responsible for antioxidant profile. RESULTS Interpretation of FTIR spectra revealed spectroscopic shifts in wavenumbers in all the complexes responsible for bonding. Further, studies confirmed the formation of complex with reduced intensities in Raman spectra. Computational studies revealed enhancement in molecular and electronic properties responsible for antioxidant power. CONCLUSION Studies revealed that complex with p-nitroaniline contribute to greater acceptor and donor power responsible for antioxidant power. These higher powers suggest the best antiradicals to trap free radicals.
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Affiliation(s)
- Ch Ravi S Kumar
- Department of Physics, Institute of Science, GITAM University, Visakhapatnam, India
| | - Anjali Jha
- Department of Chemistry, Institute of Science, GITAM University, Visakhapatnam, India
| | - Sri Deepthi
- Department of Physics, Lendi Institute of Engg & Technology, Visakhapatnam, India
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