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Hou Y, Wang Y, Tan X, Wang Y, Li W, Li X. Investigating the Antioxidant Efficiency of Tea Flavonoid Derivatives: A Density Functional Theory Study. Int J Mol Sci 2025; 26:2587. [PMID: 40141231 PMCID: PMC11942223 DOI: 10.3390/ijms26062587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2025] [Revised: 03/03/2025] [Accepted: 03/10/2025] [Indexed: 03/28/2025] Open
Abstract
In this study, the antioxidant activity of 25 natural tea flavonoids was evaluated using Density Functional Theory (DFT), which identified four flavonoids with strong antioxidant activity: kaempferol, fisetin, quercetin, and myricetin. The analysis of electronic structures confirmed the positive effects of the number of -OH groups and intramolecular hydrogen bonds on the reactivity toward radicals. Electronic properties and potential energy curves (PECs) confirmed this view. Additionally, the solvation effect analysis indicated that a polar environment enhanced the antioxidant capacity of the products. Flavonoids exhibiting a Hydrogen Atom Transfer (HAT) mechanism, as the preferred antioxidant mechanism, show great potential for applications in fields such as biology, medicine, and food.
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Affiliation(s)
- Yingmin Hou
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China; (Y.H.); (X.T.); (X.L.)
| | - Yuxi Wang
- Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, China;
| | - Xiaofei Tan
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China; (Y.H.); (X.T.); (X.L.)
| | - Yi Wang
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China; (Y.H.); (X.T.); (X.L.)
| | - Wenzhi Li
- Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, China;
| | - Xianzhen Li
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China; (Y.H.); (X.T.); (X.L.)
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Singh VK, Chaurasia H, Kumari P, Som A, Mishra R, Srivastava R, Naaz F, Singh A, Singh RK. Design, synthesis, and molecular dynamics simulation studies of quinoline derivatives as protease inhibitors against SARS-CoV-2. J Biomol Struct Dyn 2022; 40:10519-10542. [PMID: 34253149 DOI: 10.1080/07391102.2021.1946716] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A new series of quinoline derivatives has been designed and synthesized as probable protease inhibitors (PIs) against severe acute respiratory syndrome coronavirus 2. In silico studies using DS v20.1.0.19295 software have shown that these compounds behaved as PIs while interacting at the allosteric site of target Mpro enzyme (6LU7). The designed compounds have shown promising docking results, which revealed that all compounds formed hydrogen bonds with His41, His164, Glu166, Tyr54, Asp187, and showed π-interaction with His41, the highly conserved amino acids in the target protein. Toxicity Prediction by Komputer Assisted Technology results confirmed that the compounds were found to be less toxic than the reference drug. Further, molecular dynamics simulations were performed on compound 5 and remdesivir with protease enzyme. Analysis of conformational stability, residue flexibility, compactness, hydrogen bonding, solvent accessible surface area (SASA), and binding free energy revealed comparable stability of protease:5 complex to the protease: remdesivir complex. The result of hydrogen bonding showed a large number of intermolecular hydrogen bonds formed between protein residues (Glu166 and Gln189) and ligand 5, indicating strong interaction, which validated the docking result. Further, compactness analysis, SASA and interactions like hydrogen-bonding demonstrated inhibitory properties of compound 5 similar to the existing reference drug. Thus, the designed compound 5 might act as a potential inhibitor against the protease enzyme.Communicated by Ramaswamy H. SarmaHighlightsQuinoline derivatives have been designed as protease inhibitors against SARS-CoV-2.The compounds were docked at the allosteric site of SARS-CoV-2-Mpro enzyme (PDB ID: 6LU7) to study the stability of protein-ligand complex.Docking studies indicated the stable ligand-protein complexes for all designed compounds.The Toxicity Prediction by Komputer Assisted Technology protocol in DS v20.1.0.19295 software was used to evaluate the toxicity of the designed quinoline derivatives.Molecular dynamics studies indicated the formation of stable ligand-Mpro complexes.
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Affiliation(s)
- Vishal K Singh
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
| | - Himani Chaurasia
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
| | - Priyanka Kumari
- Centre of Bioinformatics, University of Allahabad, Prayagraj, India
| | - Anup Som
- Centre of Bioinformatics, University of Allahabad, Prayagraj, India
| | - Richa Mishra
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
| | - Ritika Srivastava
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
| | - Farha Naaz
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
| | - Anuradha Singh
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
| | - Ramendra K Singh
- Bioorganic Research Laboratory, Department of Chemistry, University of Allahabad, Prayagraj, India
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Davand R, Rahimpour MR, Hassanajili S, Rashedi R. Theoretical and experimental assessment of
UV
resistance of
high‐density
polyethylene: Screening and optimization of
hindered amine light stabilizers. J Appl Polym Sci 2021. [DOI: 10.1002/app.51262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Razieh Davand
- Department of Chemical Engineering Shiraz University Shiraz Iran
| | | | | | - Reza Rashedi
- Department of Polymer Engineering and Color Technology Amirkabir University of Technology Tehran Iran
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Sin KR, Ko SG, Kim CJ, Maeng TW, Choe SJ, Ri KR. Reduction of peroxynitrite by some manganoporphyrins of AEOL series: DFT approach with dispersion correction and NBO analysis. J Inorg Biochem 2020; 214:111299. [PMID: 33152662 DOI: 10.1016/j.jinorgbio.2020.111299] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/21/2020] [Accepted: 10/24/2020] [Indexed: 11/18/2022]
Abstract
The AEOL series of manganoporphyrins (MnP; AEOL compounds were named by US Aeolus pharmaceuticals) designed as superoxide dismutase mimic are well-known for their powerful catalytic activity to neutralize reactive oxygen and nitrogen species. Reductive oxygen atom cleavage from peroxynitrite (ONOO-) to form NO2 in aqueous solution by some AEOL compounds (AEOL-10113, AEOL-10150, AEOL-11114 and AEOL-11203) was studied by DFT/M06-2X computations with D3 dispersion correction and gCP (geometrical counterpoise correction) for basis set superposition error. DFT computation showed that AEOL-10150 can form the most stable association complex {MnP…OONO} among four AEOL models. AEOL-10150 complex with ONOO- has the lowest deformation energy. In AEOL compounds and their association complexes with ONOO-, Mn atom prefered the high spin state (S = 2) to the intermediate spin state (S = 1). Natural bond orbital analysis showed that electron transfer from the most negative oxygen atom in ONOO- to Mn atom in MnP has the biggest interaction energy among all kinds of donor-acceptor interactions between ONOO- and MnP.
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Affiliation(s)
- Kye-Ryong Sin
- Faculty of Chemistry, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea.
| | - Sun-Gyong Ko
- Faculty of Chemistry, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea
| | - Chol-Jin Kim
- Faculty of Chemistry, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea
| | - Tae-Won Maeng
- Faculty of Chemistry, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea
| | - Sung-Jub Choe
- Faculty of Chemistry, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea
| | - Kum-Ryong Ri
- Faculty of Chemistry, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea
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A Theoretical and Experimental Study for Screening Inhibitors for Styrene Polymerization. Processes (Basel) 2019. [DOI: 10.3390/pr7100677] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Styrene is one of the most important monomers utilized in the synthesis of various polymers. Nevertheless, during distillation, storage, and transportation of ST, undesired polymer (i.e., UP) formation can take place. Thus, the control of undesired polymerization of styrene is a challenging issue facing industry. To tackle the mentioned issue, the antipolymer and antioxidant activity of stable nitroxide radicals (i.e., SNRs) and phenolics in styrene polymerization were studied by density functional theory (DFT) calculation and experimental approach. The electrophilicity index and growth percentage have been determined by DFT calculation and experimental approach, respectively. It is depicted that 2,6-di-tert-butyl-4-methoxyphenol (DTBMP) and 2,6-di-tert-butyl-4-methylphenol (BHT) from phenolics, and 4-hydroxy-2,2,6,6-tetramethyl piperidine 1-Oxyl (4-hydroxy-TEMPO) and 4-oxo-2,2,6,6-tetramethylpiperidine 1-Oxyl (4-oxo-TEMPO) from stable nitroxide radicals were the most effective inhibitors. Also, the growth percentage of DTMBP, BHT, 4-hydroxy-TEMPO, and 4-oxo-TEMPO after 4 h were 16.40, 42.50, 24.85, and 46.8, respectively. In addition, the conversion percentage of DTMBP, BHT, 4-hydroxy-TEMPO, and 4-oxo-TEMPO after 4 h were obtained to be 0.048, 0.111, 0.065, and 0.134, respectively. Furthermore, the synergistic effect of these inhibitors was investigated experimentally, indicating that DTMBP/4-hydroxy-TEMPO exerted the best synergistic effects on the inhibition of polymerization. The optimum inhibition effect was observed at the blend of 4-hydroxy-TEMPO (25 wt.%) and DTMBP (75 wt.%,) corresponding to 6.8% polymer growth after 4 h.
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