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Madugula PPP, Balla R. Laser induced fluorescence and computational studies on the tropospheric photooxidation reactions of methyl secondary butyl ether initiated by OH radicals. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:99748-99761. [PMID: 37615909 DOI: 10.1007/s11356-023-29053-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 07/26/2023] [Indexed: 08/25/2023]
Abstract
The kinetics of the reaction of methyl secondary butyl ether with OH radicals was investigated experimentally using the pulsed laser photolysis-laser induced fluorescence technique (PLP-LIF) over temperatures ranging from 268 to 363 K. The rate coefficient value at 298 K was measured to be (1.09 ± 0.02) × 10-11 cm3 molecule-1 s-1 and the deduced Arrhenius expression is [Formula: see text]= (2.21 ± 0.29) × 10-12 exp ((471.71 ± 38.50)/T) cm3 molecule-1 s-1. To complement the experimental data, the kinetic study of the title reaction was performed computationally at CCSD(T)/cc-pVTZ//M06-2X/6-311 + G(d,p) level of theory with the incorporation of tunnelling correction from 200 to 400 K. The end products formed were qualitatively analyzed by using gas chromatography equipped with mass spectrometry (GC-MS) as detection technique and the mechanism for degradation was proposed. Thermochemical parameters were evaluated to determine the feasibility of individual reaction pathways. Atmospheric implications were evaluated and discussed in this manuscript.
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Affiliation(s)
| | - Rajakumar Balla
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India.
- Centre for Atmospheric and Climate Sciences, Indian Institute of Technology Madras, Chennai, 600036, India.
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2
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Du DX, Khang NHD, Tri NH, Nam PC, Thong NM. Exploring the Multitarget Activity of Wedelolactone against Alzheimer's Disease: Insights from In Silico Study. ACS OMEGA 2023; 8:15031-15040. [PMID: 37151498 PMCID: PMC10157682 DOI: 10.1021/acsomega.2c08014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 04/07/2023] [Indexed: 05/09/2023]
Abstract
In this study, Wedelolactone's multitarget activity against Alzheimer's disease was examined using density functional theory and molecular docking techniques. At physiological pH, the pK a and molar fractions have been estimated. The most likely relative rate constants of two radical scavenger mechanisms are formal hydrogen transfer in a lipid environment and single-electron transfer in a water solvent. Compared to Trolox (k overall = 8.96 × 104 M-1 s-1), Wedelolactone (k overall = 4.26 × 109 M-1 s-1) is more efficient in scavenging the HOO• radical in an aqueous environment. The chelation capacity of metals was investigated by examining the complexation of the Cu(II) ion at various coordination positions and calculating the complexation kinetic constants. Furthermore, molecular docking simulations showed that the known forms of Wedelolactone at physiological pH effectively inhibited the AChE and BChE enzymes by comparing their activity to that of tacrine (control). Wedelolactone is a promising drug candidate for Alzheimer's disease therapy in light of these findings.
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Affiliation(s)
- Dang Xuan Du
- Sai
Gon University, 273 An Duong Vuong Street, Ho Chi Minh 700000, Vietnam
| | | | - Nguyen Huu Tri
- Sai
Gon University, 273 An Duong Vuong Street, Ho Chi Minh 700000, Vietnam
| | - Pham Cam Nam
- The
University of Danang - University of Science and Technology, Danang 550000, Vietnam
| | - Nguyen Minh Thong
- The
University of Danang - Campus in Kon Tum, 704 Phan Dinh Phung, Kon
Tum 580000, Vietnam
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3
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Thbayh DK, Palusiak M, Viskolcz B, Fiser B. Comparative study of the antioxidant capability of EDTA and Irganox. Heliyon 2023; 9:e16064. [PMID: 37234670 PMCID: PMC10205517 DOI: 10.1016/j.heliyon.2023.e16064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 04/27/2023] [Accepted: 05/04/2023] [Indexed: 05/28/2023] Open
Abstract
Oxidative stress makes it difficult to preserve food and negatively affect the applicability of polymeric packaging. It is typically caused by an excess of free radicals, and it is dangerous to human health, resulting in the onset and development of diseases. The antioxidant ability and activity of ethylenediaminetetraacetic acid (EDTA) and Irganox (Irg) as synthetic antioxidant additives were studied. Three different antioxidant mechanisms were considered and compared by calculating bond dissociation enthalpy (BDE), ionization potential (IP), proton dissociation enthalpy (PDE), proton affinity (PA), and electron transfer enthalpy (ETE) values. Two density functional theory (DFT) methods were used, M05-2X and M06-2X with the 6-311++G(2d,2p) basis set in gas phase. Both additives can be used to protect pre-processed food products and polymeric packaging from oxidative stress related material deterioration. By comparing the two studied compounds, it was found that EDTA has a higher antioxidant potential than Irganox. To the best of our knowledge several studies have been carried out to understand the antioxidant potential of various natural and synthetic species, but EDTA and Irganox were not compared and investigated before. These additives can be used to protect pre-processed food products and polymeric packaging and prevent material deterioration caused by oxidative stress.
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Affiliation(s)
- Dalal K. Thbayh
- Institute of Chemistry, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
- Polymer Research Center, University of Basrah, Basrah, Iraq
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
| | - Marcin Palusiak
- Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, 90-236 Lodz, Poland
| | - Béla Viskolcz
- Institute of Chemistry, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
| | - Béla Fiser
- Higher Education and Industrial Cooperation Centre, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
- Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, 90-236 Lodz, Poland
- Ferenc Rakoczi II Transcarpathian Hungarian College of Higher Education, 90200 Beregszász, Transcarpathia, Ukraine
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4
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Ngo TC, Truong DH, Nguyen TTN, Quang DT, Dao DQ. On the free radical scavenging and metallic ion chelating activities of pyridoxal - Could the pro-oxidant risk be competitive? PHYTOCHEMISTRY 2022; 199:113176. [PMID: 35390394 DOI: 10.1016/j.phytochem.2022.113176] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 03/14/2022] [Accepted: 03/20/2022] [Indexed: 06/14/2023]
Abstract
Primary and secondary antioxidant activities of pyridoxal have been investigated by using density functional theory (DFT) at the M05-2X level combined with 6-311++G(d,p) basis set for non-metallic atoms and LanL2DZ for metallic ions. The former has been examined by its free radical scavenging activity towards HOO●, HO●, and NO2●via different mechanisms including formal hydrogen transfer (FHT), proton transfer (PT), single electron transfer (SET), and radical adduct formation (RAF). The latter has been accomplished through its transition metal-chelating ability with Fe(III)/Fe(II) and Cu(II)/Cu(I) ions. The results show that pyridoxal illustrates as an efficient radical scavenger, especially, for HO● and NO2● in water. The overall rate constants (koverall) for the reactions with HOO●, HO●, and NO2● radicals are 1.30 × 104, 5.76 × 109, and 1.43 × 109 M-1s-1, respectively. The SET from the anionic state is the most dominant for the HOO● and NO2● scavenging reactions, while both RAF and SET contribute largely to the reaction with highly reactive HO● radicals. Moreover, the anionic form of pyridoxal demonstrates a better role as a metal chelator than the neutral. However, the pro-oxidant risks of the formed complexes could be observed if there are superoxide radical anion (O2●-) and ascorbate (Asc-) in aqueous media.
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Affiliation(s)
- Thi Chinh Ngo
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Viet Nam.
| | - Dinh Hieu Truong
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Viet Nam
| | | | - Duong Tuan Quang
- Department of Chemistry, University of Education, Hue University, Hue, 530000, Viet Nam.
| | - Duy Quang Dao
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Viet Nam
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5
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Ngo TC, Dao DQ, Mai TVT, Nguyen TLA, Huynh LK. On The Radical Scavenging and DNA Repairing Activities by Natural Oxygenated Diterpenoids: Theoretical Insights. J Chem Inf Model 2022; 62:2365-2377. [PMID: 35522908 DOI: 10.1021/acs.jcim.1c01428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diterpenoids are abundant and important compounds in Euphorbia species owing to their structural diversity; therefore, in this study, we investigate the modern-concept antioxidant activities, including free-radical scavenging and oxidative DNA damage repairing, of highly oxygenated diterpenoids originating from the aerial part of Euphorbia helioscopia. Four compounds with structural types of ent-abietane, containing a fused furan ring in their structures, including euphelionolide A (1), euphelionolide D (2), euphelionolide I (3), and euphelionolide L (4) are selected. First, the radical-scavenging activity of these compounds was evaluated with two typical radicals HOO• and HO• in water and pentyl ethanoate (PEA, to mimic lipid environment) via three main mechanisms, namely, hydrogen atom transfer (HAT), radical adduct formation (RAF), and single electron transfer. It is found that the studied compounds are able to scavenge free radicals at multiple reactive sites favorably via HAT and RAF mechanisms, in which the former dominates in the case with HOO• while both mechanisms are competitive in the reaction with HO•. Second, chemical repairing of DNA damage is modeled with the H-atom and single electron being transferred from the studied molecules to damaged 2'-deoxyguanosine (2dG) (i.e., 2dG• radicals and 2dG•+ radical cation). Among the four compounds, euphelionolide A is shown as the most effective radical scavenger and also the highest potential species for chemical repairing of radical-damaged DNA in both water and PEA.
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Affiliation(s)
- Thi Chinh Ngo
- Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam.,Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam
| | - Duy Quang Dao
- Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam.,Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam
| | - Tam V-T Mai
- Molecular Science and Nano-Materials Lab, Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City 700000, Vietnam.,University of Science, Vietnam National University─HCMC, 227 Nguyen Van Cu, Ward 4, District 5, Ho Chi Minh City 700000, Vietnam
| | - Thi Le Anh Nguyen
- Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam.,Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam
| | - Lam K Huynh
- International University, Vietnam National University─HCMC, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 700000, Vietnam
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6
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Mechanistic studies of the reactions of nitrogen dioxide with dimethyl ether and methyl ethyl ether. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Theoretical studies of the reactions of methyl ethyl ether with hydrogen atom, triplet oxygen atom and methyl radical. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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9
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Viegas LP. Simplified Protocol for the Calculation of Multiconformer Transition State Theory Rate Constants Applied to Tropospheric OH-Initiated Oxidation Reactions. J Phys Chem A 2021; 125:4499-4512. [PMID: 33902279 DOI: 10.1021/acs.jpca.1c00683] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chemical kinetics plays a fundamental role in the understanding and modeling of tropospheric chemical processes, one of the most important being the atmospheric degradation of volatile organic compounds. These potentially harmful molecules are emitted into the troposphere by natural and anthropogenic sources and are chemically removed by undergoing oxidation processes, most frequently initiated by reaction with OH radicals, the atmosphere's "detergent". Obtaining the respective rate constants is therefore of critical importance, with calculations based on transition state theory (TST) often being the preferred choice. However, for molecules with rich conformational variety, a single-conformer method such as lowest-conformer TST is unsuitable while state-of-the-art TST-based methodologies easily become unmanageable. In this Feature Article, the author reviews his own cost-effective protocol for the calculation of bimolecular rate constants of OH-initiated reactions in the high-pressure limit based on multiconformer transition state theory. The protocol, which is easily extendable to other oxidation reactions involving saturated organic molecules, is based on a variety of freeware and open-source software and tested against a series of oxidation reactions of hydrofluoropolyethers, computationally very challenging molecules with potential environmental relevance. The main features, advantages and disadvantages of the protocol are presented, along with an assessment of its predictive utility based on a comparison with experimental rate constants.
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Affiliation(s)
- Luís P Viegas
- Aarhus Institute of Advanced Studies, Aarhus University, Høegh-Guldbergs Gade 6B, Buildings 1630-1632, Aarhus 8000, Denmark
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10
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The antioxidant capacity of an imidazole alkaloids family through single-electron transfer reactions. J Mol Model 2020; 26:321. [PMID: 33113023 DOI: 10.1007/s00894-020-04583-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/21/2020] [Indexed: 10/23/2022]
Abstract
The single-electron transfer (SET) reactions from the neutral and mono-anion species of five imidazole alkaloids (lepidines A, B, C, D, and E) against hydroperoxyl radicals have been studied using the density functional theory and the Marcus theory. The deprotonated species of three alkaloids were found to have free radical scavenging activity. The antioxidant activity was studied via single-electron transfer (SET) under physiological conditions. The SET reactions for lepidines B, D, and E were found to have rate constants ranging from 105 to 106 M-1 s-1. Therefore, they are predicted to be able to deactivate hydroperoxyl radicals and therefore the damage caused by them to polyunsaturated fatty acids. It is important to mention that the acid-base equilibrium plays an important role in their free radical scavenging activity. Graphical abstract Lepidines are predicted to be able to deactivate hydroperoxyl radicals and the damage caused by them to polyunsaturated fatty acids.
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11
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Viegas LSP, Jensen F. Reactivity of α,ω-Dihydrofluoropolyethers toward OH Predicted by Multiconformer Transition State Theory and the Interacting Quantum Atoms Approach. J Phys Chem A 2020; 124:3460-3470. [PMID: 32242667 DOI: 10.1021/acs.jpca.0c02911] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report rate constants for the tropospheric reaction between the OH radical and α,ω-dihydrofluoropolyethers, which represent a specific class of the hydrofluoropolyethers family with the formula HF2C(OCF2CF2)p(OCF2)qOCF2H. Four cases were considered: p0q2, p0q3, p1q0, and p1q1 (pxqy denoting p = x and q = y) with the calculations performed by a cost-effective protocol developed for bimolecular hydrogen-abstraction reactions. This protocol is based on multiconformer transition state theory and relies on computationally accessible M08-HX/apcseg-2//M08-HX/pcseg-1 calculations. Within the protocol's approximations, the results show that (1) the calculated rate constants are within a factor of five of the experimental results (p1q0 and p1q1) and (2) the chain length and composition have a negligible effect on the rate constants, which is consistent with the experimental work. The interacting quantum atoms energy decomposition scheme is used to analyze the observed trends and extract chemical information related to the imaginary frequencies and barrier heights that are key parameters controlling the reactivity of the reaction. The intramolecular exchange-correlation contributions in the reactants and transition states were found to be the dominating factor.
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Affiliation(s)
- Luı S P Viegas
- Aarhus Institute of Advanced Studies, Aarhus University, Høegh-Guldbergs Gade 6B, Buildings 1630-1632, Aarhus 8000, Denmark
| | - Frank Jensen
- Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
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12
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Monoalkylated Epigallocatechin-3-gallate (C18-EGCG) as Novel Lipophilic EGCG Derivative: Characterization and Antioxidant Evaluation. Antioxidants (Basel) 2020; 9:antiox9030208. [PMID: 32138219 PMCID: PMC7139963 DOI: 10.3390/antiox9030208] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 02/28/2020] [Accepted: 02/28/2020] [Indexed: 12/19/2022] Open
Abstract
Epigallocatechin-3-gallate (EGCG) has the highest antioxidant activity compared to the others catechins of green tea. However, the beneficial effects are mainly limited by its poor membrane permeability. A derivatization strategy to increase the EGCG interaction with lipid membranes is considered as one feasible approach to expand its application in lipophilic media, in particular the cellular absorption. At this purpose the hydrophilic EGCG was modified by inserting an aliphatic C18 chain linked to the gallate ring by an ethereal bond, the structure determined by NMR (Nuclear Magnetic Resonance) and confirmed by Density Functional Theory (DFT) calculations. The in vitro antioxidant activity of the mono-alkylated EGCG (C18-EGCG) was studied by the DPPH and Thiobarbituric Acid Reactive Substances (TBARS) assays, and its ability to protect cells towards oxidative stress was evaluated in Adult Retinal Pigmented Epithelium (ARPE-19) cells. Molecular Dynamics (MD) simulation and liposomal/buffer partition were used to study the interaction of the modified and unmodified antioxidants with a cell membrane model: the combined experimental-in silico approach shed light on the higher affinity of C18-EGCG toward lipid bilayer. Although the DPPH assay stated that the functionalization decreases the EGCG activity against free radicals, from cellular experiments it resulted that the lipid moiety increases the antioxidant protection of the new lipophilic derivative.
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13
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Fan C, Wang W, Shi B, Chen Y, Wang K, Zhang W, Sun Z, Ge M. A Combined Experimental and Theoretical Study on the Gas Phase Reaction of OH Radicals with Ethyl Propyl Ether. J Phys Chem A 2020; 124:721-730. [PMID: 31917920 DOI: 10.1021/acs.jpca.9b10742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of ethyl propyl ether (EnPE) with OH radicals was studied using proton-transfer-reaction mass spectrum (PTR-MS), and the rate constant was measured at 298 K and atmospheric pressure using the relative rate method: kexp(OH+EnPE) = (1.13 ± 0.09) × 10-11 cm3 molecules-1 s-1. In addition, a parallel theoretical study was performed using the traditional transition state theory (TST) with a tunnelling effect correction in combination at M05-2X method with two basis sets, 6-311++G(d,p) and aug-cc-pVTZ. According to these calculations, H atom abstraction occurs more favorably from the methylene group adjacent to the -O- bond than from the other groups. The theoretical calculation of the total rate constant of the reaction of EnPE with OH radicals was consistent with the experimental values. The gas-phase products indicated that the major products observed were ethyl formate, ethyl propionate, propionic acid. Combined with the experimental and theoretical results, the possible reaction mechanisms were proposed and discussed. The atmospheric implications of the studied reaction are presented, and the lifetime of EnPE in the presence of OH radicals was evaluated to be approximately 1 day.
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Affiliation(s)
- Cici Fan
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,College of Chemistry and Material Science , Hebei Normal University , Shijiazhuang 050024 , China
| | - Weigang Wang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Bo Shi
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,College of Chemistry and Material Science , Hebei Normal University , Shijiazhuang 050024 , China
| | - Yan Chen
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Ke Wang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Wenyu Zhang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Zheng Sun
- College of Chemistry and Material Science , Hebei Normal University , Shijiazhuang 050024 , China
| | - Maofa Ge
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China.,Center for Excellence in Region¶al Atmospheric Environment , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , P. R. China
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14
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Synthesis, Characterization and Antioxidant Properties of a New Lipophilic Derivative of Edaravone. Antioxidants (Basel) 2019; 8:antiox8080258. [PMID: 31370225 PMCID: PMC6720979 DOI: 10.3390/antiox8080258] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 02/07/2023] Open
Abstract
As part of a program aimed to obtain antioxidants able to interact with cell membrane, edaravone (EdV, 3-methyl-1-phenyl-2-pyrazolin-5-one), a well-known free radical scavenger, has been modified by alkylation at its allylic position (4) with a C-18 hydrocarbon chain, and the increased lipophilicity has been determined towards the interaction with liposomes. The obtained derivative has been studied by means of density functional theory (DFT) methods in order to characterize its lowest energy conformers and predict its antioxidant properties with respect to the parent compound EdV. The in vitro antioxidant activity of C18-edaravone was studied by means of the α,α-diphenyl-β-picrylhydrazyl (DPPH) assay and in lipid peroxidation experiments performed on artificial lipid membranes using water-soluble as well as lipid-soluble radical initiators. Moreover, since oxidative stress is involved in numerous retinal degenerative diseases, the ability of C18-edaravone to contrast 2,2-azobis (2-amidinopropane hydrochloride) (AAPH)-induced cell death was assessed in adult retinal pigmented epithelium (ARPE-19) cells. Overall, the results demonstrated that the newly synthesized molecule has a high affinity for lipid membrane, increasing the efficacy of the unmodified edaravone under stress conditions.
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15
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Viegas LP. Theoretical determination of the OH-initiated oxidation rate constants of $${\alpha ,\omega }$$-dialkoxyfluoropolyethers. Theor Chem Acc 2019. [DOI: 10.1007/s00214-019-2436-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Zhu J, Tsona NT, Mellouki A, Du L. Atmospheric initiated oxidation of short chain aliphatic ethers. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Viegas LP. Multiconformer transition state theory rate constants for the reaction between OH and ‐dimethoxyfluoropolyethers. INT J CHEM KINET 2019. [DOI: 10.1002/kin.21259] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Luís P. Viegas
- Aarhus Institute of Advanced StudiesAarhus UniversityAarhus Denmark
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18
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Potter DG, Wiseman S, Blitz MA, Seakins PW. Laser Photolysis Kinetic Study of OH Radical Reactions with Methyl tert-Butyl Ether and Trimethyl Orthoformate under Conditions Relevant to Low Temperature Combustion: Measurements of Rate Coefficients and OH Recycling. J Phys Chem A 2018; 122:9701-9711. [PMID: 30427183 DOI: 10.1021/acs.jpca.8b09122] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Methyl tertiary butyl ether (MTBE) and trimethyl orthoformate (TMOF) are potential biofuel ethers and could replace conventional fossil fuels, or act as additives to aid combustion. Laser flash photolysis with laser-induced fluorescence detection of the OH radical has been used to measure the rate coefficients of the OH reaction with these ethers, from 298 K to approximately 740 K. The temperature dependence of the rate coefficients is parametrized as kOH+MTBE(298-680 K) = 9.8 × 10-13× ( T/298)2.7 × exp(2500/R T) cm3 molecule-1 s-1 and kOH+TMOF(298-744 K) = 8.0 × 10-13 × [( T/298)2.6 + ( T/298)-8.1] × exp[2650/R T] cm3 molecule-1 s-1. The room temperature (298 K) bimolecular rate coefficients were measured as kOH+MTBE = (2.81 ± 0.32) × 10-12 cm3 molecule-1 s-1 and kOH+TMOF = (4.65 ± 0.50) × 10-12 cm3 molecule-1 s-1 where the errors represent statistical uncertainties at the 2σ level in combination with an estimated 10% systematic error. Regeneration of OH radicals was observed for both reactions at higher temperatures in the presence of O2 via biexponential OH decays, which were observed above 489 K and 568 K, for TMOF and MTBE respectively. The OH yield from MTBE/O2, between 620 and 700 K, was invariant with the concentration of oxygen (1015-1018 molecules cm-3) at (36 ± 5)%. Mechanisms for OH regeneration from MTBE are briefly discussed and compared with those in the literature and from dimethyl and diethyl ether. The lower OH yield from MTBE, compared to these other ethers, is most likely due to competition with an HO2 formation channel.
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Affiliation(s)
- David G Potter
- School of Chemistry , University of Leeds , Leeds , LS2 9JT , U.K.,School of Chemical and Process Engineering , University of Leeds , Leeds , LS2 9JT , U.K
| | - Scott Wiseman
- School of Chemistry , University of Leeds , Leeds , LS2 9JT , U.K
| | - Mark A Blitz
- School of Chemistry , University of Leeds , Leeds , LS2 9JT , U.K.,National Centre for Atmospheric Science , University of Leeds , Leeds , LS2 9JT , U.K
| | - Paul W Seakins
- School of Chemistry , University of Leeds , Leeds , LS2 9JT , U.K.,National Centre for Atmospheric Science , University of Leeds , Leeds , LS2 9JT , U.K
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19
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Viegas LP. Exploring the Reactivity of Hydrofluoropolyethers toward OH through a Cost-Effective Protocol for Calculating Multiconformer Transition State Theory Rate Constants. J Phys Chem A 2018; 122:9721-9732. [DOI: 10.1021/acs.jpca.8b08970] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luís P. Viegas
- Aarhus Institute of Advanced Studies, Aarhus University, Høegh-Guldbergs Gade 6B, Buildings 1630-1632, Aarhus 8000, Denmark
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21
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Paul S, Deka RC, Gour NK. Quantum chemical study on the reaction mechanism and kinetics of Cl-initiated oxidation of methyl n-propyl ether. Theor Chem Acc 2018. [DOI: 10.1007/s00214-018-2239-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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Zhu J, Wang S, Tsona NT, Jiang X, Wang Y, Ge M, Du L. Gas-Phase Reaction of Methyl n-Propyl Ether with OH, NO3, and Cl: Kinetics and Mechanism. J Phys Chem A 2017; 121:6800-6809. [DOI: 10.1021/acs.jpca.7b06877] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jianqiang Zhu
- Environment
Research Institute, Shandong University, Ji’nan 250100, China
- Shenzhen
Research Institute, Shandong University, Shenzhen 518057, China
| | - Shuyan Wang
- Environment
Research Institute, Shandong University, Ji’nan 250100, China
| | - Narcisse T. Tsona
- Environment
Research Institute, Shandong University, Ji’nan 250100, China
| | - Xiaotong Jiang
- Environment
Research Institute, Shandong University, Ji’nan 250100, China
| | - Yifeng Wang
- Key Lab of Colloid
and Interface Science of the Education Ministry, Department
of Chemistry and Chemical Engineering, Shandong University, Ji’nan 250100, China
| | - Maofa Ge
- Beijing
National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory
for Structural Chemistry of Unstable and Stable Species, Institute
of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Lin Du
- Environment
Research Institute, Shandong University, Ji’nan 250100, China
- Shenzhen
Research Institute, Shandong University, Shenzhen 518057, China
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23
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Antiradical activity of delphinidin, pelargonidin and malvin towards hydroxyl and nitric oxide radicals: The energy requirements calculations as a prediction of the possible antiradical mechanisms. Food Chem 2017; 218:440-446. [DOI: 10.1016/j.foodchem.2016.09.106] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 08/28/2016] [Accepted: 09/16/2016] [Indexed: 12/23/2022]
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25
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Lu Y, Wang A, Shi P, Zhang H. A Theoretical Study on the Antioxidant Activity of Piceatannol and Isorhapontigenin Scavenging Nitric Oxide and Nitrogen Dioxide Radicals. PLoS One 2017; 12:e0169773. [PMID: 28068377 PMCID: PMC5222500 DOI: 10.1371/journal.pone.0169773] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 12/21/2016] [Indexed: 11/26/2022] Open
Abstract
The antioxidant activity of naturally occurring stilbene compounds piceatannol (PIC) and isorhapontigenin (ISO) scavenging two free radicals (NO and NO2) were studied using density functional theory (DFT) method. Four reaction mechanisms have been considered: hydrogen atom transfer (HAT), radical adduct formation (RAF), single electron transfer (SET), and sequential proton loss electron transfer (SPLET). The reaction channels in water solution were traced independently, and the respective thermodynamic and kinetic parameters were obtained. We found PIC and ISO scavenge NO mainly through RAF mechanism, and scavenge NO2 through HAT mechanism. The capacity of PIC scavenging NO2 is much higher than ISO, but the reactivity of scavenging NO is lower than ISO.
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Affiliation(s)
- Yang Lu
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
| | - AiHua Wang
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
| | - Peng Shi
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
| | - Hui Zhang
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
- * E-mail:
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26
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Bao JL, Truhlar DG. Variational transition state theory: theoretical framework and recent developments. Chem Soc Rev 2017; 46:7548-7596. [DOI: 10.1039/c7cs00602k] [Citation(s) in RCA: 207] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This article reviews the fundamentals of variational transition state theory (VTST), its recent theoretical development, and some modern applications.
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Affiliation(s)
- Junwei Lucas Bao
- Department of Chemistry
- Chemical Theory Center, and Minnesota Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
| | - Donald G. Truhlar
- Department of Chemistry
- Chemical Theory Center, and Minnesota Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
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27
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Sun J, Shao Y, Wu W, Tang Y, Zhang Y, Hu Y, Liu J, Yi H, Chen F, Cheng Y. A quantum chemical study on ˙Cl-initiated atmospheric degradation of acrylonitrile. RSC Adv 2017. [DOI: 10.1039/c7ra01521f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Degradation of acrylonitrile (CH2CHCN) by reaction with atomic chlorine was studied using quantum chemical methods.
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28
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Lu Y, Wang A, Shi P, Zhang H, Li Z. Kinetic Reaction Mechanism of Sinapic Acid Scavenging NO2 and OH Radicals: A Theoretical Study. PLoS One 2016; 11:e0162729. [PMID: 27622460 PMCID: PMC5021273 DOI: 10.1371/journal.pone.0162729] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 08/26/2016] [Indexed: 01/12/2023] Open
Abstract
The mechanism and kinetics underlying reactions between the naturally-occurring antioxidant sinapic acid (SA) and the very damaging ·NO2 and ·OH were investigated through the density functional theory (DFT). Two most possible reaction mechanisms were studied: hydrogen atom transfer (HAT) and radical adduct formation (RAF). Different reaction channels of neutral and anionic sinapic acid (SA-) scavenging radicals in both atmosphere and water medium were traced independently, and the thermodynamic and kinetic parameters were calculated. We find the most active site of SA/SA- scavenging ·NO2 and ·OH is the -OH group in benzene ring by HAT mechanism, while the RAF mechanism for SA/SA- scavenging ·NO2 seems thermodynamically unfavorable. In water phase, at 298 K, the total rate constants of SA eliminating ·NO2 and ·OH are 1.30×108 and 9.20×109 M-1 S-1 respectively, indicating that sinapic acid is an efficient scavenger for both ·NO2 and ·OH.
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Affiliation(s)
- Yang Lu
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
| | - AiHua Wang
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
| | - Peng Shi
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
| | - Hui Zhang
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China
- * E-mail:
| | - ZeSheng Li
- Key Laboratory of Cluster Science of Ministry of Education & School of Chemistry, Beijing Institute of Technology, Beijing, People’s Republic of China
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29
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Ivanović N, Jovanović L, Marković Z, Marković V, Joksović MD, Milenković D, Djurdjević PT, Ćirić A, Joksović L. Potent 1,2,4-Triazole-3-thione Radical Scavengers Derived from Phenolic Acids: Synthesis, Electrochemistry, and Theoretical Study. ChemistrySelect 2016. [DOI: 10.1002/slct.201600738] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nevena Ivanović
- Faculty of Science, Department of Chemistry; University of Kragujevac; R. Domanovića 12 34000 Kragujevac Serbia
| | - Ljiljana Jovanović
- Faculty of Sciences; University of Novi Sad; Trg D. Obradovića 3 21000 Novi Sad Serbia
| | - Zoran Marković
- Department of Chemical-Technological Sciences; State University of Novi Pazar; Vuka Karadžića bb 36300 Novi Pazar Serbia
| | - Violeta Marković
- Faculty of Science, Department of Chemistry; University of Kragujevac; R. Domanovića 12 34000 Kragujevac Serbia
| | - Milan D. Joksović
- Faculty of Science, Department of Chemistry; University of Kragujevac; R. Domanovića 12 34000 Kragujevac Serbia
| | - Dejan Milenković
- Bioengineering Research and Development Center; 34000 Kragujevac Serbia
| | - Predrag T. Djurdjević
- Faculty of Science, Department of Chemistry; University of Kragujevac; R. Domanovića 12 34000 Kragujevac Serbia
| | - Andrija Ćirić
- Faculty of Science, Department of Chemistry; University of Kragujevac; R. Domanovića 12 34000 Kragujevac Serbia
| | - Ljubinka Joksović
- Faculty of Science, Department of Chemistry; University of Kragujevac; R. Domanovića 12 34000 Kragujevac Serbia
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30
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Mechanism and kinetic study on the degradation of unsaturated esters initiated by OH radical. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1908-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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31
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MARKOVIC Z, DOROVIC J, DIMITRIC MARKOVIC JM, BIOCANIN R, AMIC D. Comparative density functional study of antioxidative activity of the hydroxybenzoic acids and their anions. Turk J Chem 2016. [DOI: 10.3906/kim-1503-89] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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32
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Sandhiya L, Ponnusamy S, Senthilkumar K. Atmospheric oxidation mechanism of OH-initiated reactions of diethyl ether – the fate of the 1-ethoxy ethoxy radical. RSC Adv 2016. [DOI: 10.1039/c6ra14801h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The 1-ethoxy ethoxy radical resulting from the secondary peroxy chemistry in the oxidation of diethyl ether (DEE) by hydroxyl radical leads to the formation of ethyl formate in major quantities and ethyl acetate in minor quantities.
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Affiliation(s)
- L. Sandhiya
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| | - S. Ponnusamy
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| | - K. Senthilkumar
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
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33
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Lu Y, Wang A, Shi P, Zhang H, Li Z. Quantum Chemical Study on the Antioxidation Mechanism of Piceatannol and Isorhapontigenin toward Hydroxyl and Hydroperoxyl Radicals. PLoS One 2015; 10:e0133259. [PMID: 26176778 PMCID: PMC4503757 DOI: 10.1371/journal.pone.0133259] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 06/25/2015] [Indexed: 11/19/2022] Open
Abstract
A systematic study of the antioxidation mechanisms behind hydroxyl (•OH) and hydroperoxyl (•OOH) radical scavenging activity of piceatannol (PIC) and isorhapontigenin (ISO) was carried out using density functional theory (DFT) method. Two reaction mechanisms, abstraction (ABS) and radical adduct formation (RAF), were discussed. A total of 24 reaction pathways of scavenging •OH and •OOH with PIC and ISO were investigated in the gas phase and solution. The thermodynamic and kinetic properties of all pathways were calculated. Based on these results, we evaluated the antioxidant activity of every active site of PIC and ISO and compared the abilities of PIC and ISO to scavenge radicals. According to our results, PIC and ISO may act as effective •OH and •OOH scavengers in organism. A4-hydroxyl group is a very important active site for PIC and ISO to scavenge radicals. The introducing of -OH or -OCH3 group to the ortho-position of A4-hydroxyl group would increase its antioxidant activity. Meanwhile, the conformational effect was researched, the results suggest that the presence and pattern of intramolecular hydrogen bond (IHB) are considerable in determining the antioxidant activity of PIC and ISO.
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Affiliation(s)
- Yang Lu
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China
| | - AiHua Wang
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China
| | - Peng Shi
- College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China
| | - Hui Zhang
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China
- * E-mail:
| | - ZeSheng Li
- Key Laboratory of Cluster Science of Ministry of Education & School of Chemistry, Beijing Institute of Technology, Beijing, 100081, People’s Republic of China
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35
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36
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Petrović ZD, Đorović J, Simijonović D, Petrović VP, Marković Z. Experimental and theoretical study of antioxidative properties of some salicylaldehyde and vanillic Schiff bases. RSC Adv 2015. [DOI: 10.1039/c5ra02134k] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A set of ten phenolic Schiff bases was evaluated for their antioxidative properties. Two of them, one salicylaldehyde and one vanillic, showed high activity. Parameters obtained by DFT supported the experimental findings.
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Affiliation(s)
- Zorica D. Petrović
- Faculty of Science
- University of Kragujevac
- Department of Chemistry
- 34000 Kragujevac
- Republic of Serbia
| | - Jelena Đorović
- Bioengineering Research and Development Center
- 34000 Kragujevac
- Republic of Serbia
| | - Dušica Simijonović
- Faculty of Science
- University of Kragujevac
- Department of Chemistry
- 34000 Kragujevac
- Republic of Serbia
| | - Vladimir P. Petrović
- Faculty of Science
- University of Kragujevac
- Department of Chemistry
- 34000 Kragujevac
- Republic of Serbia
| | - Zoran Marković
- Bioengineering Research and Development Center
- 34000 Kragujevac
- Republic of Serbia
- Department of Chemical-Technological Sciences
- State University of Novi Pazar
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37
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Zavala-Oseguera C, Galano A, Merino G. Computational study on the kinetics and mechanism of the carbaryl + OH reaction. J Phys Chem A 2014; 118:7776-81. [PMID: 25142884 DOI: 10.1021/jp507244s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Carbaryl is released into the atmosphere as a spray drift immediately following the application. In order to evaluate its fate in the atmosphere, a computational study on the kinetics of the OH radical reaction with carbaryl is presented. Different reaction paths are studied at the M05-2X/6-311++G(d,p) level. A complex mechanism involving the formation of a stable reactant complex is proposed and the temperature dependence of the rate coefficients is studied in the 280-650 K temperature range. The principal degradation path is the hydroxyl radical addition to naphthalene, but hydrogen abstractions from the methyl group are identified as a secondary significant path. The rate coefficients, computed using the conventional transition state theory, reproduce quite well the scarce experimental data available.
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Affiliation(s)
- Claudia Zavala-Oseguera
- Departamento de Química, Universidad de Guanajuato , Noria Alta s/n C.P. 36050, Guanajuato, Guanajuato, México
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38
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Pérez-González A, Galano A, Ortiz JV. Vertical Ionization Energies of Free Radicals and Electron Detachment Energies of Their Anions: A Comparison of Direct and Indirect Methods Versus Experiment. J Phys Chem A 2014; 118:6125-31. [DOI: 10.1021/jp505276n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Adriana Pérez-González
- Departamento
de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, México DF 04510, México
| | - Annia Galano
- Departamento
de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina. Iztapalapa, C.P. 09340 México DF, México
| | - J. V. Ortiz
- Department
of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
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39
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Đorović J, Marković JMD, Stepanić V, Begović N, Amić D, Marković Z. Influence of different free radicals on scavenging potency of gallic acid. J Mol Model 2014; 20:2345. [PMID: 24965934 DOI: 10.1007/s00894-014-2345-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 06/08/2014] [Indexed: 01/08/2023]
Abstract
The M05-2X/6-311++G(d,p) and B3LYP-D2/6-311++G(d,p) models are used to evaluate scavenging potency of gallic acid. The hydrogen atom transfer (HAT), sequential proton loss electron transfer (SPLET), and single electron transfer followed by proton transfer (SET-PT) mechanisms of gallic acid with some radicals ((•)OO(-), (•)OH, and CH3OO(•)) were investigated using the corresponding thermodynamic quantities: bond dissociation enthalpy (BDE), ionization potential (IP), and proton affinity (PA). Namely, the ΔHBDE, ΔHIP, and ΔHPA values of the corresponding reactions in some solvents (water, DMSO, pentylethanoate, and benzene) are investigated using an implicit solvation model (SMD). An approach based on the reactions enthalpies related to the examined mechanisms is applied. This approach shows that a thermodynamically favored mechanism depends on the polarity of reaction media and properties of free radical reactive species. The most acidic 4-OH group of gallic acid is the active site for radical inactivation. The results of this investigation indicate that the SPLET mechanism can be a favored reaction pathway for all three radicals in all solvents, except for (•)OH in the aqueous solution. In water, gallic acid can inactivate (•)OH by the HAT mechanism.
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Affiliation(s)
- Jelena Đorović
- Bioengineering Research and Development Center, 34000, Kragujevac, Republic of Serbia,
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40
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Energy requirements of the reactions of kaempferol and selected radical species in different media: towards the prediction of the possible radical scavenging mechanisms. Struct Chem 2014. [DOI: 10.1007/s11224-014-0453-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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41
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Investigation of the radical scavenging potency of hydroxybenzoic acids and their carboxylate anions. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1163-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Prasanthkumar KP, Alvarez-Idaboy JR. An experimental and theoretical study of the kinetics and mechanism of hydroxyl radical reaction with 2-aminopyrimidine. RSC Adv 2014. [DOI: 10.1039/c4ra00811a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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43
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Dimitrić Marković JM, Milenković D, Amić D, Mojović M, Pašti I, Marković ZS. The preferred radical scavenging mechanisms of fisetin and baicalein towards oxygen-centred radicals in polar protic and polar aprotic solvents. RSC Adv 2014. [DOI: 10.1039/c4ra02577f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The flavonoids fisetin and baicalein have been investigated for their ability to scavenge certain anion radicals.
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Affiliation(s)
| | - Dejan Milenković
- Bioengineering Research and Development Center
- 34000 Kragujevac, Republic of Serbia
| | - Dragan Amić
- Faculty of Agriculture
- The Josip Juraj Strossmayer University
- HR-31107 Osijek, Croatia
| | - Miloš Mojović
- Faculty of Physical Chemistry
- University of Belgrade
- 11000 Belgrade, Republic of Serbia
| | - Igor Pašti
- Faculty of Physical Chemistry
- University of Belgrade
- 11000 Belgrade, Republic of Serbia
| | - Zoran S. Marković
- Bioengineering Research and Development Center
- 34000 Kragujevac, Republic of Serbia
- Department of Chemical-Technological Sciences
- State University of Novi Pazar
- 36300 Novi Pazar, Republic of Serbia
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44
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Zhang T, Wang R, Zhou L, Wang Z, Xu Q, Min S, Wang W. A computational study on the mechanism and kinetics of the reaction between CH3CH2S and OH. RSC Adv 2014. [DOI: 10.1039/c4ra07780f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Addition–elimination channels CH3CHS + H2O, CH2CH2 + HSOH, CH3CHSO + H2 and CH3CH2SH + O are the major channels in the reaction between CH3CH2S and OH.
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Affiliation(s)
- Tianlei Zhang
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Rui Wang
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Liting Zhou
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Zhiyin Wang
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Qiong Xu
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Suotian Min
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Wenliang Wang
- Key Laboratory for Macromolecular Science of Shaanxi Province
- School of Chemistry & Chemical Engineering
- Shaanxi Normal University
- Xi'an, China
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Medina ME, Galano A, Alvarez-Idaboy JR. Theoretical study on the peroxyl radicals scavenging activity of esculetin and its regeneration in aqueous solution. Phys Chem Chem Phys 2014; 16:1197-207. [DOI: 10.1039/c3cp53889c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Medina ME, Iuga C, Álvarez-Idaboy JR. Antioxidant activity of fraxetin and its regeneration in aqueous media. A density functional theory study. RSC Adv 2014. [DOI: 10.1039/c4ra08394f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fraxetin is an excellent and versatile antioxidant in aqueous media. In addition it regenerates, scavenging two radical equivalents per cycle.
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Affiliation(s)
- M. E. Medina
- Departamento de Física y Química Teórica
- Facultad de Química
- Universidad Nacional Autónoma de México
- México, Mexico
| | - C. Iuga
- Departamento de Sistemas Biológicos
- Universidad Autónoma Metropolitana-Xochimilco
- 04960 México, Mexico
| | - J. R. Álvarez-Idaboy
- Departamento de Física y Química Teórica
- Facultad de Química
- Universidad Nacional Autónoma de México
- México, Mexico
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Reaction of Dimethyl Ether with Hydroxyl Radicals: Kinetic Isotope Effect and Prereactive Complex Formation. J Phys Chem A 2013; 117:8343-51. [DOI: 10.1021/jp405724a] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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First RAFT polymerization of captodative 2-acetamidoacrylic acid (AAA) monomer: An experimental and theoretical study. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.07.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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A DFT and PM6 study of free radical scavenging activity of ellagic acid. MONATSHEFTE FUR CHEMIE 2013. [DOI: 10.1007/s00706-013-0949-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Degirmenci I, Ozaltın TF, Karahan O, Van Speybroeck V, Waroquier M, Aviyente V. Origins of the solvent effect on the propagation kinetics of acrylic acid and methacrylic acid. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26589] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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