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Vo QV, Hoa NT, Flavel M, Thong NM, Boulebd H, Nam PC, Quang DT, Mechler A. A Comprehensive Study of the Radical Scavenging Activity of Rosmarinic Acid. J Org Chem 2023; 88:17237-17248. [PMID: 38011833 DOI: 10.1021/acs.joc.3c02093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Rosmarinic acid (RA) is reported in separate studies to be either an inducer or reliever of oxidative stress, and this contradiction has not been resolved. In this study, we present a comprehensive examination of the radical scavenging activity of RA using density functional theory calculations in comparison with experimental data. In model physiological media, RA exhibited strong HO• radical scavenging activity with overall rate constant values of 2.89 × 1010 and 3.86 × 109 M-1 s-1. RA is anticipated to exhibit excellent scavenging properties for HOO• in an aqueous environment (koverall = 3.18 × 108 M-1 s-1, ≈2446 times of Trolox) following the hydrogen transfer and single electron transfer pathways of the dianion state. The neutral form of the activity is equally noteworthy in a lipid environment (koverall = 3.16 × 104 M-1 s-1) by the formal hydrogen transfer mechanism of the O6(7,15,16)-H bonds. Chelation with RA may prevent Cu(II) from reduction by the ascorbic acid anion (AA-), hence blocking the OIL-1 pathway, suggesting that RA in an aqueous environment also serves as an OIL-1 antioxidant. The computational findings exhibit strong concurrence with the experimental observations, indicating that RA possesses a significant efficacy as a radical scavenger in physiological environments.
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Affiliation(s)
- Quan V Vo
- The University of Danang - University of Technology and Education, Danang550000, Vietnam
| | - Nguyen Thi Hoa
- The University of Danang - University of Technology and Education, Danang550000, Vietnam
| | - Matthew Flavel
- TPM Bioactives Division, The Product Makers Pty. Ltd., Melbourne 3173, Australia
- School of Life Sciences, La Trobe University, Bundoora, Victoria 3086, Australia
| | - Nguyen Minh Thong
- The University of Danang-University of Science and Education, Danang 550000, Vietnam
| | - Houssem Boulebd
- Laboratory of Synthesis of Molecules with Biological Interest, University of Frères Mentouri Constantine 1, Constantine 25017, Algeria
| | - Pham Cam Nam
- Department of Chemical Engineering, The University of Danang - University of Science and Technology, Danang 550000, Vietnam
| | - Duong Tuan Quang
- University of Education, Hue University, Hue City 530000, Vietnam
| | - Adam Mechler
- Department of Chemistry and Physics, La Trobe University, Bundoora, Victoria 3086, Australia
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2
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Bay MV, Nam PC, Hoa NT, Mechler A, Vo QV. Antiradical Activity of Lignans from Cleistanthus sumatranus: Theoretical Insights into the Mechanism, Kinetics, and Solvent Effects. ACS Omega 2023; 8:38668-38675. [PMID: 37867707 PMCID: PMC10586290 DOI: 10.1021/acsomega.3c05964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Accepted: 09/22/2023] [Indexed: 10/24/2023]
Abstract
Sumatranus lignans (SL) isolated from Cleistanthus sumatranus have demonstrated bioactivities, e.g., they were shown to exhibit immunosuppressive properties in previous research. Their structure suggests potential antioxidant activity that has not attracted any attention thus far. Consistently, a comprehensive analysis of the antioxidant activity of these compounds is highly desirable with the view of prospective medical applications. In this work, the mechanism and kinetics of the antiradical properties of SL against hydroperoxyl radicals were studied by using calculations based on density functional theory (DFT). In the lipid medium, it was discovered that SL reacted with HOO• through the formal hydrogen transfer mechanism with a rate constant of 101-105 M-1 s-1, whereas in aqueous media, the activity primarily occurred through the sequential proton loss electron transfer mechanism with rate constants of 102-108 M-1 s-1. In both lipidic and aqueous environments, the antiradical activity of compounds 6 and 7 exceeds that of resveratrol, ascorbic acid, and Trolox. These substances are therefore predicted to be good radical scavengers in physiological environments.
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Affiliation(s)
- Mai Van Bay
- The
University of Danang - University of Science and Education, Danang 550000, Vietnam
| | - Pham Cam Nam
- The
University of Danang - University of Science and Technology, Danang 550000, Vietnam
| | - Nguyen Thi Hoa
- The
University of Danang - University of Technology and Education, Danang 550000, Vietnam
| | - Adam Mechler
- Department
of Biochemistry and Chemistry, La Trobe
University, Victoria 3086, Australia
| | - Quan V. Vo
- The
University of Danang - University of Technology and Education, Danang 550000, Vietnam
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3
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Ho TH, Bui VQ, Nguyen QAT, Kawazoe Y, Kim SG, Nam PC. Unleashing the power of boron: enhancing nitrogen reduction reaction through defective ReS 2 monolayers. Phys Chem Chem Phys 2023; 25:25389-25397. [PMID: 37705426 DOI: 10.1039/d3cp02647g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Density functional theory (DFT) calculations were utilized to investigate the electrocatalytic potential of single boron (B) atom doping in defective ReS2 monolayers as an active site. Our investigation revealed that B-doped defective ReS2, containing S and S-Re-S defects, demonstrated remarkable conductivity, and emerged as an exceptionally active catalyst for nitrogen reduction reactions (NRR), exhibiting limiting potentials of 0.63 and 0.53 V, respectively. For both cases, we determined the potential by examining the hydrogenation of adsorbed N2* to N2H*. Although the competing hydrogen evolution reaction (HER) process appeared dominant in the S-Re-S defect case, its impact was minimal. The outstanding NRR performance can be ascribed to the robust chemical interactions between B and N atoms. The adsorption of N2 on B weakens the N-N bond, thereby facilitating the formation of NH3. Moreover, we verified the selectivity and stability of the catalysts for NRR. Our findings indicate that B-doped defective ReS2 monolayers hold considerable promise for electrocatalysis in a variety of applications.
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Affiliation(s)
- Thi H Ho
- Laboratory for Computational Physics, Institute for Computational Science and Artificial Intelligence, Van Lang University, Ho Chi Minh City, Vietnam
- Faculty of Mechanical-Electrical and Computer Engineering, School of Technology, Van Lang University, Ho Chi Minh City, Vietnam.
| | - Viet Q Bui
- Advanced Institute of Science and Technology, The University of Danang, 41 Le Duan, Danang, Vietnam.
| | - Quynh Anh T Nguyen
- Advanced Institute of Science and Technology, The University of Danang, 41 Le Duan, Danang, Vietnam.
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan
- School of Physics, Institute of Science, Suranaree University of Technology, 111 University Avenue, Nakhon Ratchasima, 30000, Thailand
- Physics and Nanotechnoloy, SRM Institute of Science and Technology, Kattankurathur, Tamil Nadu, 603203, India
| | - Seong-Gon Kim
- Department of Physics & Astronomy and Center for Computational Sciences, Mississippi State University, Starkville, Mississippi 39762, USA
| | - Pham Cam Nam
- Advanced Institute of Science and Technology, The University of Danang, 41 Le Duan, Danang, Vietnam.
- Faculty of Chemical Engineering, The University of Danang-University of Science and Technology, Danang City 550000, Vietnam
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Pham AD, Tao QB, Nam PC. Optimizing the Superhydrophobicity of the Composite PDMS/PUA Film Produced by a R2R System. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c04491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Anh-Duc Pham
- Faculty of Mechanical Engineering, The University of Danang─University of Science and Technology, Danang City 550000, Vietnam
| | - Quang Bang Tao
- Faculty of Mechanical Engineering, The University of Danang─University of Science and Technology, Danang City 550000, Vietnam
| | - Pham Cam Nam
- Faculty of Chemical Engineering, The University of Danang─University of Science and Technology, Danang City 550000, Vietnam
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Quy PT, Dzung NA, Van Bay M, Van Bon N, Dung DM, Nam PC, Thong NM. Insights into antiradical mechanism and pro-oxidant enzyme inhibitor activity of walterolactone A/B 6- O-gallate-β-d-pyranoglucoside originating from Euonymus laxiflorus Champ. using in silico study. RSC Adv 2022; 12:29975-29982. [PMID: 36321076 PMCID: PMC9580510 DOI: 10.1039/d2ra05312h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 10/11/2022] [Indexed: 11/07/2022] Open
Abstract
The ability of a new compound, Wal, (walterolactone A/B 6-O-gallate-β-d-pyranoglucoside) originating from Euonymus laxiflorus Champ. as a hydroperoxyl radical scavenger and pro-oxidant enzyme inhibitor was studied in silico. Different mechanisms, reaction locations, and chemical species of Wal in aqueous solution were taken into consideration. Formal hydrogen transfer from the OH group has been discovered as the chemical process that contributes most to the antioxidant properties of Wal in nonpolar and aqueous solutions. The overall rate coefficients for polar and non-polar environments are expected to have values of 7.85 × 106 M-1 s-1 and 4.84 × 105 M-1 s-1, respectively. According to the results of the investigation, Wal has greater scavenging activity against the HOO˙ radical than the reference antioxidant Trolox at physiological pH (7.4). In addition, docking results indicate that Wal's antioxidant properties involve the inhibition of the activity of enzyme families (CP450, MP, NO, and XO) that are responsible for ROS production.
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Affiliation(s)
- Phan Tu Quy
- Department of Natural Sciences & Technology, Tay Nguyen University Buon Ma Thuot 630000 Vietnam
| | - Nguyen Anh Dzung
- Institute of Biotechnology and Environment, Tay Nguyen University Buon Ma Thuot 630000 Vietnam
| | - Mai Van Bay
- The University of Danang - University of Science and Education Danang 550000 Vietnam
| | - Nguyen Van Bon
- Institute of Biotechnology and Environment, Tay Nguyen University Buon Ma Thuot 630000 Vietnam
| | - Doan Manh Dung
- Institute of Biotechnology and Environment, Tay Nguyen University Buon Ma Thuot 630000 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 Vietnam
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7
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Cam Nam P, Van Bay M, Vo QV, Mechler A, Minh Thong N. Tautomerism and antioxidant power of sulfur-benzo[h]quinoline: DFT and molecular docking studies. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Nam PC, Trung NQ, Hoa NT, Bich HN, Manh TD, Quang DT, Mechler A, Vo QV. Oxoberberine: a promising natural antioxidant in physiological environments. RSC Adv 2022; 12:9738-9743. [PMID: 35424953 PMCID: PMC8961270 DOI: 10.1039/d2ra01372j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 03/22/2022] [Indexed: 11/21/2022] Open
Abstract
Oxoberberine (OB, 2,10-dihydroxy-3,9-dimethoxy-8-oxo-protoberberine, artathomsonine), which was isolated from Artabotrys thomsonii, was shown to exhibit potent antioxidant activity in vitro, however that is the only reported evidence of the radical scavenging activity of this compound thus far. In the present study, thermodynamic and kinetic calculations were used to determine the free radical scavenging activity of OB against a range of biologically important species, under physiological conditions. In the first part the activity is calculated against the HOO˙ radical that is both biologically important and a reference radical for comparison. It was found that OB has high antiradical capacity against HOO˙ in both lipid medium and water at physiological pH with k overall = 1.33 × 105 and 1.73 × 106 M-1 s-1, respectively. The formal hydrogen transfer mechanism defined the activity in nonpolar environments, whereas in the aqueous solution the single electron transfer competes with the hydrogen transfer pathway. The results showed that, in lipid medium, the HOO˙ trapping capability of OB is better than typical antioxidants such as Trolox, BHT, resveratrol and ascorbic acid. Similarly, the activity of OB in water at pH 7.4 is roughly 19 and 7 times faster than those of Trolox and BHT, respectively, but slightly lower than the activities of resveratrol or ascorbic acid. In the second part, it was found that OB also exhibits high activity against other typical free radicals such as CH3O˙, CH3OO˙, CCl3OO˙, NO2, SO4˙-, DPPH and ABTS˙+ with k f ranging from 2.03 × 105 to 5.74 × 107 M-1 s-1. Hence, it is concluded that OB is a promising radical scavenger in the physiological environment.
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Affiliation(s)
- Pham Cam Nam
- Department of Chemical Engineering, The University of Danang-University of Science and Technology Danang 550000 Vietnam
| | - Nguyen Quang Trung
- The University of Danang-University of Science and Education Da Nang 550000 Vietnam
| | - Nguyen Thi Hoa
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | - Huynh Ngoc Bich
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | - Tran Duc Manh
- The University of Danang-University of Science and Education Da Nang 550000 Vietnam
| | | | - Adam Mechler
- Department of Chemistry and Physics, La Trobe University Victoria 3086 Australia
| | - Quan V Vo
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
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9
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Tam NM, Hieu LT, Thong NM, Hoa NT, Hoang LP, Nam PC, Quang DT, Mechler A, Vo QV. Mechanistic and kinetic studies of the radical scavenging activity of natural abietanes: A theoretical insight. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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10
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Trung N, Thong NM, Cuong DH, Manh TD, Hoang LP, Hien NK, Nam PC, Quang DT, Mechler A, Vo QV. Radical Scavenging Activity of Natural Anthraquinones: a Theoretical Insight. ACS Omega 2021; 6:13391-13397. [PMID: 34056486 PMCID: PMC8158809 DOI: 10.1021/acsomega.1c01448] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 04/29/2021] [Indexed: 06/12/2023]
Abstract
Anthraquinones (ANQs) isolated from Paederia plants are known to have antidiarrheal, antitussive, anthelmintic, analgesic, anti-inflammatory, antihyperlipidemic, antihyperglycaemic, and antimicrobial activities. The antioxidant properties were also noted but not confirmed thus far. In this study, the superoxide and hydroperoxide radical scavenging activities of six ANQs were evaluated using a computational approach. The results suggest that the ANQs exhibit low HOO• antiradical activity in all environments, including the gas phase (k < 102 M-1 s-1). In contrast, the ANQs might exert excellent O2 •- radical scavenging activity, particularly in aqueous solution. The rate constants of the superoxide anion scavenging in water (at pH = 7.4) range from 3.42 × 106 to 3.70 × 108 M-1 s-1. Compared with typical antioxidants such as ascorbic acid and quercetin, the superoxide anion scavenging activity of ANQs is significantly higher. Thus, the ANQs are promising O2 •- radical scavengers in polar media.
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Affiliation(s)
- Nguyen
Quang Trung
- The
University of Danang—University of Science and Education, Da Nang 550000, Vietnam
- Quality
Assurance and Testing Center 2, Danang 550000, Vietnam
| | - Nguyen Minh Thong
- The
University of Danang, Campus in Kon
Tum, 704 Phan Dinh Phung, Kon
Tum, 580000, Vietnam
| | - Dao Hung Cuong
- The
University of Danang—University of Science and Education, Da Nang 550000, Vietnam
| | - Tran Duc Manh
- The
University of Danang—University of Science and Education, Da Nang 550000, Vietnam
| | - Loc Phuoc Hoang
- Institute
of Research and Development, Duy Tan University, Danang 550000, Vietnam
| | - Nguyen Khoa Hien
- Mientrung
Institute for Scientific Research, Vietnam
Academy of Science and Technology, Hue 530000, Vietnam
| | - Pham Cam Nam
- Department
of Chemical Engineering, The University
of Danang—University of Science and Technology, Danang 550000, Vietnam
| | | | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Bundoora, Victoria 3086, Australia
| | - Quan V. Vo
- Faculty
of Chemical Technology-Environment, The
University of Danang—University of Technology and Education, Da Nang 550000, Vietnam
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11
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Nam PC, Thong NM, Hoa NT, Quang DT, Hoang LP, Mechler A, Vo QV. Is natural fraxin an overlooked radical scavenger? RSC Adv 2021; 11:14269-14275. [PMID: 35423974 PMCID: PMC8697747 DOI: 10.1039/d1ra01360b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 04/02/2021] [Indexed: 01/08/2023] Open
Abstract
Fraxin (FX) (7-hydroxy-6-methoxycoumarin 8-glucoside) is a typical natural product of the coumarin family. This compound was shown to protect endothelial cells from oxidative stress; however, the nature of its antioxidant properties is still ambiguous. In this study, we report on a systematic evaluation of the radical scavenging activity of FX using a two-tier protocol based on thermodynamic and kinetic calculations. The results show that FX has moderate activity in the aqueous physiological environment against a range of radicals including HO˙, CCl3O˙, CCl3OO˙, NO2, , and HOO˙. The latter was examined in detail due to the prevalence of HOO˙ as a source of oxidative stress in biological systems. HOO˙ scavenging activity was promising in the gas phase but low in physiological environments with k overall = 1.57 × 106, 3.13 × 102 and 2.68 × 103 M-1 s-1 in the gas phase, pentyl ethanoate and water solvents, respectively. The formal hydrogen transfer mechanism at the O7-H bond dominates the hydroperoxyl radical scavenging of FX in the nonpolar media, whereas, in the polar environment, the activity is exerted by the single electron transfer mechanism of the anion state. This activity falls behind typical antioxidants such as Trolox, ascorbic acid, and trans-resveratrol under the studied conditions. Thus FX may have multiple health benefits, but it is not an outstanding natural antioxidant.
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Affiliation(s)
- Pham Cam Nam
- Department of Chemical Engineering, 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 Vietnam
| | - Nguyen Thi Hoa
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | | | - Loc Phuoc Hoang
- Institute of Research and Development, Duy Tan University Danang 550000 Vietnam
| | - Adam Mechler
- Department of Chemistry and Physics, La Trobe University Victoria 3086 Australia
| | - Quan V Vo
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
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Tam NM, Nam PC, Quang DT, Tung NT, Vu VV, Ngo ST. Binding of inhibitors to the monomeric and dimeric SARS-CoV-2 Mpro. RSC Adv 2021; 11:2926-2934. [PMID: 35424256 PMCID: PMC8694027 DOI: 10.1039/d0ra09858b] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 01/04/2021] [Indexed: 11/29/2022] Open
Abstract
SARS-CoV-2 rapidly infects millions of people worldwide since December 2019. There is still no effective treatment for the virus, resulting in the death of more than one million patients. Inhibiting the activity of SARS-CoV-2 main protease (Mpro), 3C-like protease (3CLP), is able to block the viral replication and proliferation. In this context, our study has revealed that in silico screening for inhibitors of SARS-CoV-2 Mpro can be reliably done using the monomeric structure of the Mpro instead of the dimeric one. Docking and fast pulling of ligand (FPL) simulations for both monomeric and dimeric forms correlate well with the corresponding experimental binding affinity data of 24 compounds. The obtained results were also confirmed via binding pose and noncovalent contact analyses. Our study results show that it is possible to speed up computer-aided drug design for SARS-CoV-2 Mpro by focusing on the monomeric form instead of the larger dimeric one.
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Affiliation(s)
- Nguyen Minh Tam
- Computational Chemistry Research Group, Ton Duc Thang University Ho Chi Minh City Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City Vietnam
| | - Pham Cam Nam
- Department of Chemistry, The University of Danang, University of Science and Technology Danang Vietnam
| | | | - Nguyen Thanh Tung
- Institute of Materials Science, Vietnam Academy of Science and Technology Hanoi Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology Hanoi Vietnam
| | - Van V Vu
- NTT Hi-Tech Institute, Nguyen Tat Thanh University Ho Chi Minh City Vietnam
| | - Son Tung Ngo
- Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City Vietnam
- Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University Ho Chi Minh City Vietnam
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13
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Boulebd H, Mechler A, Hoa NT, Nam PC, Quang DT, Vo QV. Insights into the mechanisms and kinetics of the hydroperoxyl radical scavenging activity of Artepillin C. NEW J CHEM 2021. [DOI: 10.1039/d1nj00666e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Through the single electron transfer mechanism, Artepillin C scavenges the hydroperoxyl radical in water approximately 572 times faster than Trolox.
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Affiliation(s)
- Houssem Boulebd
- Laboratory of Synthesis of Molecules with Biological Interest
- University of Frères Mentouri Constantine 1
- Constantine
- Algeria
| | - Adam Mechler
- Department of Chemistry and Physics
- La Trobe University
- Victoria 3086
- Australia
| | - Nguyen Thi Hoa
- The University of Danang – University of Technology and Education
- Danang 550000
- Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering
- The University of Danang – University of Science and Technology
- Danang 550000
- Vietnam
| | | | - Quan V. Vo
- The University of Danang – University of Technology and Education
- Danang 550000
- Vietnam
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14
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Ngo ST, Nguyen TH, Pham DH, Tung NT, Nam PC. Thermodynamics and kinetics in antibody resistance of the 501Y.V2 SARS-CoV-2 variant. RSC Adv 2021; 11:33438-33446. [PMID: 35497518 PMCID: PMC9042284 DOI: 10.1039/d1ra04134g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 10/06/2021] [Indexed: 02/01/2023] Open
Abstract
Understanding the thermodynamics and kinetics of the binding process of an antibody to the SARS-CoV-2 receptor-binding domain (RBD) of the spike protein is very important for the development of COVID-19 vaccines. In particular, it is essential to understand how the binding mechanism may change under the effects of RBD mutations. In this context, we have demonstrated that the South African variant (B1.351 or 501Y.V2) can resist the neutralizing antibody (NAb). Three substitutions in the RBD including K417N, E484K, and N501Y alter the free energy landscape, binding pose, binding free energy, binding kinetics, hydrogen bonding, nonbonded contacts, and unbinding pathway of RBD + NAb complexes. The low binding affinity of NAb to 501Y.V2 RBD confirms the antibody resistance of the South African variant. Moreover, the fragment of NAb + RBD can be used as an affordable model to investigate changes in the binding process between the mutated RBD and antibodies. Increasing FEL minima of 501Y.V2 RBD + antibody in comparison with the WT RBD systems imply that the complex 501Y.V2 RBD + antibody is more unstable than the WT one.![]()
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Affiliation(s)
- Son Tung Ngo
- Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Trung Hai Nguyen
- Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Duc-Hung Pham
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati 45229, OH, USA
| | - Nguyen Thanh Tung
- Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering, The University of Da Nang, University of Science and Technology, Da Nang City, Vietnam
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15
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Tam NM, Pham MQ, Ha NX, Nam PC, Phung HTT. Computational estimation of potential inhibitors from known drugs against the main protease of SARS-CoV-2. RSC Adv 2021; 11:17478-17486. [PMID: 35479689 PMCID: PMC9032918 DOI: 10.1039/d1ra02529e] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 05/03/2021] [Indexed: 12/20/2022] Open
Abstract
The coronavirus disease (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has rapidly spread worldwide recently, leading to global social and economic disruption. Although the emergently approved vaccine programs against SARS-CoV-2 have been rolled out globally, the number of COVID-19 daily cases and deaths has remained significantly high. Here, we attempt to computationally screen for possible medications for COVID-19 via rapidly estimating the highly potential inhibitors from an FDA-approved drug database against the main protease (Mpro) of SARS-CoV-2. The approach combined molecular docking and fast pulling of ligand (FPL) simulations that were demonstrated to be accurate and suitable for quick prediction of SARS-CoV-2 Mpro inhibitors. The results suggested that twenty-seven compounds were capable of strongly associating with SARS-CoV-2 Mpro. Among them, the seven top leads are daclatasvir, teniposide, etoposide, levoleucovorin, naldemedine, cabozantinib, and irinotecan. The potential application of these drugs in COVID-19 therapy has thus been discussed. Approved drugs predicted to interact with critical residues in the substrate-binding site of SARS-CoV-2 Mpro can be promising inhibitors.![]()
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Affiliation(s)
- Nguyen Minh Tam
- Computational Chemistry Research Group
- Ton Duc Thang University
- Ho Chi Minh City
- Vietnam
- Faculty of Applied Sciences
| | - Minh Quan Pham
- Institute of Natural Products Chemistry
- Vietnam Academy of Science and Technology
- Hanoi
- Vietnam
- Graduate University of Science and Technology
| | - Nguyen Xuan Ha
- Faculty of Chemistry and Environment
- Thuyloi University
- Ministry of Agriculture and Rural Development
- Hanoi
- Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering
- The University of Da Nang
- University of Science and Technology
- Da Nang City
- Vietnam
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16
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Vo QV, Bay MV, Nam PC, Quang DT, Flavel M, Hoa NT, Mechler A. Theoretical and Experimental Studies of the Antioxidant and Antinitrosant Activity of Syringic Acid. J Org Chem 2020; 85:15514-15520. [PMID: 33150788 DOI: 10.1021/acs.joc.0c02258] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Syringic acid (SA) is a natural phenolic acid found in vegetables, fruits, and other plant-based foods. A range of biological activities were proposed for this compound including anticancer, antimicrobial, anti-inflammation, and anti-diabetic activities, as well as antioxidant and antinitrosant properties. In this study, the focus is on the latter two. The HO•, HOO•, NO, and NO2 scavenging activities of SA were evaluated in physiological environments by kinetic and thermodynamic calculations. The computed rate constants of the HO• radical scavenging of SA were 4.63 × 109 and 9.77 × 107 M-1 s-1 in polar and nonpolar solvents, respectively. A comparison with the experimentally determined rate constant in aqueous solution yields a kcalculated/kexperimental ratio of 0.3, thus the computed kinetic data are reasonably accurate. SA exhibited excellent HOO• and NO2 scavenging activity in water (koverall(HOO•) = 1.53 × 108 M-1 s-1 and koverall(NO2) = 1.98 × 108 M-1 s-1), whereas it did not show NO scavenging activity in any of the studied environments. In lipid medium, SA exhibited weak activity. Thus, in polar environments, the HOO• radical scavenging of SA is 1.53 times higher than that of ascorbic acid. Consistently, SA is a promising antioxidant and antinitrosant agent in polar environments.
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Affiliation(s)
- Quan V Vo
- The University of Danang-University of Technology and Education, Danang 550000, Vietnam
| | - Mai Van Bay
- Department of Chemistry, The University of Danang-University of Science and Education, Danang 550000, Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering, The University of Danang-University of Science and Technology, Danang 550000, Vietnam
| | - Duong Tuan Quang
- University of Education, Hue University, Hue City 530000, Vietnam
| | - Matthew Flavel
- TPM Bioactives Division, The Product Makers Pty Ltd., Melbourne 3173, Australia.,School of Life Sciences, La Trobe University, Victoria 3086, Australia
| | - Nguyen Thi Hoa
- The University of Danang-University of Technology and Education, Danang 550000, Vietnam
| | - Adam Mechler
- Department of Chemistry and Physics, La Trobe University, Victoria 3086, Australia
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17
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Thao PT, Tran BT, Thong NM, Quang DT, Hien NK, Nguyen MT, Nam PC. Substituent Effects on the N-H Bond Dissociation Enthalpies, Ionization Energies, Acidities, and Radical Scavenging Behavior of 3,7-Disubstituted Phenoxazines and 3,7-Disubstituted Phenothiazines. ACS Omega 2020; 5:27572-27581. [PMID: 33134721 PMCID: PMC7594321 DOI: 10.1021/acsomega.0c04144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
The substituent effects on the N-H bond dissociation enthalpies (BDE), ionization energies (IE), acidities (proton affinity, PA), and radical scavenging behavior of 3,7-disubstituted phenoxazines (PhozNHs) and 3,7-disubstituted phenothiazines (PhtzNHs) were determined using density functional theory, with the M05-2X functional in conjunction with the 6-311++G(d,p) basis set. These thermochemical parameters calculated in both gas phase and benzene solution with respect to the changes in several different substituents including halogen, electron-withdrawing, and electron-donating groups at both 3 and 7 positions in both PhozNHs and PhtzNHs systems were analyzed in terms of the inherent relationships between them with some quantitative substituent effect parameters. The kinetic rate constants of hydrogen-atom exchange reactions between PhozNH and PhtzNH derivatives with the HOO• radical were also calculated, and the effects of the substituents on the kinetic behaviors of these reactions were thereby quantitatively evaluated.
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Affiliation(s)
- Pham Thi
Thu Thao
- Department
of Chemistry, The University of Da Nang-University
of Science and Technology, Da Nang 550000, Vietnam
- Department
of Chemistry, University of Sciences, Hue
University, Hue 530000, Vietnam
- Le
Quy Don Gifted High School Quang Tri, Dong Ha, Quang Tri 520000, Vietnam
| | - Binh Thuc Tran
- Department
of Chemistry, University of Sciences, Hue
University, Hue 530000, Vietnam
| | | | | | - Nguyen Khoa Hien
- Mientrung
Institute for Scientific Research, Vietnam
Academy of Science and Technology, Hue 530000, Vietnam
| | - Minh Tho Nguyen
- Institute
for Computational Science and Technology (ICST), Ho Chi Minh City 700000, Vietnam
- Department
of Chemistry, KU Leuven, Leuven 3001, Belgium
| | - Pham Cam Nam
- Department
of Chemistry, The University of Da Nang-University
of Science and Technology, Da Nang 550000, Vietnam
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18
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Huong DQ, Lan Huong NT, Anh Nguyet TT, Duong T, Tuan D, Thong NM, Nam PC. Pivotal Role of Heteroatoms in Improving the Corrosion Inhibition Ability of Thiourea Derivatives. ACS Omega 2020; 5:27655-27666. [PMID: 33134729 PMCID: PMC7594336 DOI: 10.1021/acsomega.0c04241] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
1,3-Diphenyl-2-thiourea (DPTU) and 1-phenyl-3-(2-pyridyl)-2-thiourea (PPTU) were selected as the researched subject for investigating the effect of heteroatoms on the low carbon steel corrosion inhibition ability. Results from the potentiodynamic polarization measurements (PPM) indicate that the addition of a nitrogen atom in the benzene ring increases the corrosion inhibition efficiency of PPTU (97.2%), being higher than that of DPTU (93.1%) at the same condition of 2.0 × 10-4 M at 30 °C. The Nyquist diagrams show that increasing the concentrations of both DPTU and PPTU will enhance the charge-transfer resistance and reduce the double-layer capacitance. The obtained data based on PPM and electrochemical impedance spectroscopy methods are in accordance to the analysis based on the scanning electrochemical microscopy images. Besides, results from quantum chemical calculations prove that the heteroatoms in the inhibitor molecules are the adsorption centers, and the benzene rings increase the electrostatic interaction between the inhibitor molecules and the steel surface. Results from Monte Carlo and molecular dynamics simulation have clarified the adsorption mechanism of DPTU and PPTU on the steel surface. Adsorption energies confirm that PPTU displays the higher inhibition ability as compared with DPTU.
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Affiliation(s)
- Dinh Quy Huong
- Department
of Chemistry, University of Education, Hue
University, Hue City 530000, Viet Nam
| | - Nguyen Thi Lan Huong
- Department
of Chemistry, University of Education, Hue
University, Hue City 530000, Viet Nam
| | - Tran Thi Anh Nguyet
- Department
of Chemistry, University of Education, Hue
University, Hue City 530000, Viet Nam
| | - Tran Duong
- Department
of Chemistry, University of Education, Hue
University, Hue City 530000, Viet Nam
| | - Dinh Tuan
- Department
of Chemistry, University of Sciences, Hue
University, Hue City 530000, Viet Nam
| | - Nguyen Minh Thong
- The
University of Danang, Campus in Kon Tum, Kontum City 580000, Viet Nam
| | - Pham Cam Nam
- Department
of Chemistry, The University of Danang—University
of Science and Technology, Danang
City 550000, Vietnam
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19
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Hien NK, Van Bay M, Tran PD, Khanh NT, Luyen ND, Vo QV, Van DU, Nam PC, Quang DT. A coumarin derivative-Cu 2+ complex-based fluorescent chemosensor for detection of biothiols. RSC Adv 2020; 10:36265-36274. [PMID: 35517943 PMCID: PMC9057049 DOI: 10.1039/d0ra05651k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 09/14/2020] [Indexed: 12/19/2022] Open
Abstract
Herein, a novel fluorescent sensor has been developed for the detection of biothiols based on theoretical calculations of the stability constant of the complex between a Cu2+ ion and (E)-3-((2-(benzo[d]thiazol-2-yl)hydrazono)methyl)-7-(diethylamino) coumarin (BDC) as a fluorescent ligand. In this study, on the basis of density functional theory method, the Gibbs free energy of ligand-exchange reaction and the solvation model were carried out using thermodynamic cycles. The obtained results are in good agreement with the experimental data. The BDC–Cu2+ complex can be used as a fluorescent sensor for the detection of biothiols in the presence of non-thiol containing amino acids, with a detection limit for cysteine at 0.3 μM. Moreover, theoretical calculations of excited states were used to elucidate variations in the fluorescence properties. The computed results show that the excited doublet states D2 and D1 are dark doublet states, which quench the fluorescence of the complex. This study opens a new research direction towards the utilization of complexes between metal ions and fluorescent ligands for the detection of biothiols based on the theoretical calculations of stability constants.![]()
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Affiliation(s)
- Nguyen Khoa Hien
- Mientrung Institute for Scientific Research, Vietnam Academy of Science and Technology Hue 530000 Vietnam
| | - Mai Van Bay
- University of Education, Hue University Hue 530000 Vietnam .,The University of Danang -University of Science and Education Danang 550000 Vietnam
| | - Phan Diem Tran
- Mientrung Institute for Scientific Research, Vietnam Academy of Science and Technology Hue 530000 Vietnam
| | - Nguyen Tan Khanh
- Faculty of Pharmacy, Hue University of Medicine and Pharmacy Hue 530000 Vietnam
| | | | - Quan V Vo
- Faculty of Chemical Technology-Environment, The University of Danang-University of Technology and Education 48 Cao Thang Danang 550000 Vietnam
| | | | - Pham Cam Nam
- The University of Danang -University of Science and Technology Danang 550000 Vietnam
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20
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Vo QV, Hoa NT, Nam PC, Quang DT, Mechler A. In Silico Evaluation of the Radical Scavenging Mechanism of Mactanamide. ACS Omega 2020; 5:24106-24110. [PMID: 32984732 PMCID: PMC7513356 DOI: 10.1021/acsomega.0c03646] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 08/25/2020] [Indexed: 05/08/2023]
Abstract
Mactanamide (MA) is a diketopiperazine isolated from marine fungi of the genus Aspergillus. This compound is known as a natural antioxidant from experimental studies, yet this activity has not been successfully modeled thus far. In this work, the hydroperoxyl radical scavenging activity of MA was evaluated in the gas phase and physiological environments by thermodynamic and kinetic calculations. The results revealed that the HOO• radical scavenging of MA in the lipid media follows the formal hydrogen transfer mechanism via hydrogen abstraction at the O11-H bond. In the aqueous solution, however, the antioxidant activity follows the sequential proton loss electron transfer mechanism. The rate constant of the HOO• scavenging of MA in the polar environment is about 1045 times (k overall = 2.23 × 106 M-1 s-1) higher than that in the lipid medium (k overall = 2.20 × 103 M-1 s-1). In polar media, the HOO• radical scavenging activity of MA is therefore 18 times higher than that of Trolox, the reference compound when assessing antioxidant activity. The results presented here align well with the experimental data, validating the mechanistic pathways and thus providing useful insights into the antioxidant activity of MA.
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Affiliation(s)
- Quan V. Vo
- Institute
of Research and Development, Duy Tan University, Danang 550000, Vietnam
- The
University of Danang—University of Technology and Education, 48 Cao Thang, Danang 550000, Vietnam
| | - Nguyen Thi Hoa
- The
University of Danang—University of Technology and Education, 48 Cao Thang, Danang 550000, Vietnam
| | - Pham Cam Nam
- Department
of Chemical Engineering, The University
of Danang—University of Science and Technology, Danang 550000, Vietnam
| | - Duong Tuan Quang
- University
of Education, Hue University, Hue
City 530000, Vietnam
| | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Victoria 3086, Australia
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21
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Hien N, Bay MV, Bao NC, Vo QV, Cuong ND, Thien TV, Nhung NTA, Van DU, Nam PC, Quang DT. Coumarin-Based Dual Chemosensor for Colorimetric and Fluorescent Detection of Cu 2+ in Water Media. ACS Omega 2020; 5:21241-21249. [PMID: 32875260 PMCID: PMC7450636 DOI: 10.1021/acsomega.0c03097] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 07/28/2020] [Indexed: 05/30/2023]
Abstract
A novel coumarin derivative (5) was synthesized and used as a colorimetric and fluorescent probe for selective detection of Cu2+ ions in the presence of other metal ions, with the detection limits of 5.7 and 4.0 ppb, respectively. Cu2+ ion reacts with probe 5 to form a 1:1 stoichiometry complex, resulting in a remarkable redshift of absorption maximum from 460 to 510 nm, as well as almost completely quenching fluorescence intensity of probe 5 at the wavelength of 536 nm. These changes can be distinctly observed by naked eyes. In addition, the working pH range of probe 5 is wide and suitable for physiological conditions, thus probe 5 may be used for detection of Cu2+ ions in living cells. The stable structures of probe 5 and its 1:1 complex with Cu2+ ion were optimized at the PBE0/6-31+G(d) level of theory. The presence and characteristics of bonds in compounds were studied through atoms in a molecule and natural bond orbital analysis. The formation of the complex led to a strong transfer of electron density from probe 5 as a ligand to Cu2+ ion, resulting in breaking the π-electron conjugated system, which is the cause of fluorescence quenching and color change of 5-Cu2+ complex.
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Affiliation(s)
- Nguyen
Khoa Hien
- Mientrung
Institute for Scientific Research, Vietnam
Academy of Science and Technology, Hue 530000, Vietnam
| | - Mai Van Bay
- University of Education,
Hue University, Hue 530000, Vietnam
- The
University of Danang-University of Science and Education, Danang 550000, Vietnam
| | | | - Quan V. Vo
- Faculty
of Chemical Technology-Environment, The
University of Danang-University of Technology and Education, 48 Cao Thang, Danang 550000, Vietnam
| | | | - Tran Vinh Thien
- Faculty
of Geology & Mineral Resources Engineering, Ho Chi Minh University of Natural Resources and Environment, Ho Chi Minh 700000, Vietnam
| | | | | | - Pham Cam Nam
- The
University of Danang-University of Science and Technology, Danang 550000, Vietnam
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22
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Vo QV, Thong NM, Le Huyen T, Nam PC, Tam NM, Hoa NT, Mechler A. A thermodynamic and kinetic study of the antioxidant activity of natural hydroanthraquinones. RSC Adv 2020; 10:20089-20097. [PMID: 35520421 PMCID: PMC9054120 DOI: 10.1039/d0ra04013d] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 05/15/2020] [Indexed: 11/21/2022] Open
Abstract
Novel hydroanthraquinones isolated from marine algal-derived endophytic fungus Talaromyces islandicus EN-501 exhibited promising antioxidant properties in preliminary studies, raising the prospect of adapting these compounds for therapeutic use in diseases caused by oxidative stress. For medicinal applications it is beneficial to develop a full understanding of the antioxidant activity of these compounds. In this study, the hydroperoxide radical scavenging activity of five natural hydroanthraquinones was evaluated by kinetic and thermodynamic calculations. The results showed that the radical scavenging of these hydroanthraquinones in the gas phase and in lipid solvents was defined by the formal hydrogen transfer mechanism, that for the polar environments was decided by the sequential proton loss electron transfer pathway. The hydroanthraquinones exhibited good hydroperoxide scavenging activity in both polar and non-polar media. The overall rate constant values for the radical scavenging reaction were in the range of 3.42 × 101 to 2.60 × 105 M-1 s-1 and 3.80 × 106 to 5.87 × 107 M-1 s-1 in pentyl ethanoate and water solvents, respectively. Thus the activity of 8-hydroxyconiothyrinone B (1) is about 2.6 and 444.6 times higher than that of Trolox in the studied solvents, identifying 8-hydroxyconiothyrinone B as a promising antioxidant.
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Affiliation(s)
- Quan V Vo
- Institute of Research and Development, Duy Tan University Danang 550000 Vietnam
| | - Nguyen Minh Thong
- The University of Danang, Campus in Kon Tum 704 Phan Dinh Phung Kon Tum Vietnam
| | - Trinh Le Huyen
- Department of Applied Chemistry, National Chiao Tung University Hsinchu 30010 Taiwan
- Department of Chemical Engineering, The University of Danang, University of Science and Technology Danang 550000 Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering, The University of Danang, University of Science and Technology Danang 550000 Vietnam
| | - Nguyen Minh Tam
- Computational Chemistry Research Group, Ton Duc Thang University Ho Chi Minh City Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City Vietnam
| | - Nguyen Thi Hoa
- Academic Affairs, The University of Danang-University of Technology and Education 48 Cao Thang Da Nang 550000 Vietnam
| | - Adam Mechler
- Department of Chemistry and Physics, La Trobe University Victoria 3086 Australia
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23
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Bay MV, Nam PC, Quang DT, Mechler A, Hien NK, Hoa NT, Vo QV. Theoretical Study on the Antioxidant Activity of Natural Depsidones. ACS Omega 2020; 5:7895-7902. [PMID: 32309698 PMCID: PMC7160836 DOI: 10.1021/acsomega.9b04179] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Accepted: 03/11/2020] [Indexed: 05/16/2023]
Abstract
Depsidones are secondary metabolites in lichens with a range of potential health benefits. Among others, these compounds are believed to exhibit high hydroxyl radical and superoxide scavenging abilities, warranting a detailed investigation of their antioxidant properties. In this study, the radical scavenging activity of natural depsidones from Ramalina lichenized fungi was investigated in silico. Calculations of the thermodynamic parameters suggested that the main radical scavenging pathway follows the formal hydrogen transfer (FHT) mechanism; however, unexpectedly low rate constants were found in the CH3OO• scavenging reaction. Establishing that the depsidones are mostly ionized in an aqueous environment suggested that the single-electron transfer (SET) mechanism should not be ruled out. Consistently, depsidones were revealed to be excellent HO• and O2 •- scavengers in aqueous solutions (k = 4.60 × 105 - 8.60 × 109 M-1 s-1 and k = 2.60 × 108 - 8.30 × 109 M-1 s-1, respectively) following the sequential proton loss electron transfer (SPLET) mechanism. These results suggest that natural fungal depsidones are potent hydroxyl and superoxide radical scavengers in aqueous solutions.
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Affiliation(s)
- Mai Van Bay
- Department
of Chemistry, The University of Da Nang,
University of Science and Education, Da Nang 550000, Vietnam
| | - Pham Cam Nam
- Department
of Chemical Engineering, The University
of Da Nang, University of Science and Technology, Da Nang 550000, Vietnam
| | - Duong Tuan Quang
- University
of Education, Hue University, Hue City 530000, Vietnam
| | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Victoria 3086, Australia
| | - Nguyen Khoa Hien
- Mientrung
Institute for Scientific Research, Academy
of Science and Technology, Hue
City 530000, Vietnam
| | - Nguyen Thi Hoa
- Academic
Affairs, The University of Danang - University
of Technology and Education, Da
Nang 550000, Vietnam
| | - Quan V. Vo
- Institute
of Research and Development, Duy Tan University, Danang 550000, Vietnam
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24
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Van Quan V, Phu HT, Thao PTT, Nam PC. Substituent effects on antioxidant activity of monosubstituted indole-3-carbinols: A DFT study. VJCH 2020. [DOI: 10.1002/vjch.2019000110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Vo Van Quan
- Quang Tri Teacher Training College; Km 3, No 9 Highway Dong Ha City, Quang Tri 48000 Viet Nam
| | - Ho Thi Phu
- Hue University of Sciences - Hue University; 77 Nguyen Hue Hue City 49000 Viet Nam
| | - Pham Thi Thu Thao
- Hue University of Sciences - Hue University; 77 Nguyen Hue Hue City 49000 Viet Nam
| | - Pham Cam Nam
- Department of Chemical Engineering; The University of Da Nang - University of Science and Technology; 54 Nguyen Luong Bang, Hoa Khanh Bach, Lien Chieu Da Nang City 50000 Viet Nam
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25
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Thong NM, Vo QV, Le Huyen T, Van Bay M, Dung NN, Thu Thao PT, Nam PC. Functionalization and antioxidant activity of polyaniline–fullerene hybrid nanomaterials: a theoretical investigation. RSC Adv 2020; 10:14595-14605. [PMID: 35497132 PMCID: PMC9051919 DOI: 10.1039/d0ra00903b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 03/23/2020] [Indexed: 12/28/2022] Open
Abstract
Functionalized fullerene is one of the most advantageous nanotechnologies to develop novel materials for potential biomedical applications. In this study, we applied the ONIOM-GD3 approach to explore the nucleophilic addition reaction mechanism between polyaniline (emeraldine and leucoemeraldine forms) and fullerene. Potential energy surfaces were also analyzed to predict the predominantly formed products of the functionalized reaction. The themoparameters, such as bond dissociation enthalpy (BDE), ionization energy (IE), and electron affinity (EA), characterized by two mechanisms HAT and SET, were used to evaluate the antioxidant activities of the selected compounds. Moreover, the calculated HOMO, LUMO, and DOS results indicate that the electronic structures of polyaniline–fullerene were significantly affected by the presence of fullerene. The computational results show that C60-L1 seems to be the best antioxidant following the SET mechanism. Functionalized fullerene is one of the most advantageous nanotechnologies to develop novel materials for potential biomedical applications.![]()
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Affiliation(s)
| | - Quan V. Vo
- The University of Danang
- University of Technology and Education
- Danang 550000
- Vietnam
| | - Trinh Le Huyen
- Department of Applied Chemistry
- National Chiao Tung University
- Hsinchu 30010
- Taiwan
- Department of Chemical Engineering
| | - Mai Van Bay
- The University of Danang
- University of Science and Education
- Danang 550000
- Vietnam
| | - Nguyen Nho Dung
- Danang University of Physical Education and Sports
- Danang 550000
- Vietnam
| | - Pham Thi Thu Thao
- Department of Chemical Engineering
- The University of Danang
- University of Science and Technology
- Danang 550000
- Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering
- The University of Danang
- University of Science and Technology
- Danang 550000
- Vietnam
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26
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Nguyen NT, Nguyen TH, Pham TNH, Huy NT, Bay MV, Pham MQ, Nam PC, Vu VV, Ngo ST. Autodock Vina Adopts More Accurate Binding Poses but Autodock4 Forms Better Binding Affinity. J Chem Inf Model 2019; 60:204-211. [DOI: 10.1021/acs.jcim.9b00778] [Citation(s) in RCA: 131] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Nguyen Thanh Nguyen
- Department of Theoretical Physics, Ho Chi Minh City University of Science, Ho Chi Minh City 700000, Vietnam
| | - Trung Hai Nguyen
- Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - T. Ngoc Han Pham
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - Nguyen Truong Huy
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - Mai Van Bay
- Department of Chemical Engineering, The University of Da Nang, University of Science and Technology, Da Nang City 550000, Vietnam
| | - Minh Quan Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering, The University of Da Nang, University of Science and Technology, Da Nang City 550000, Vietnam
| | - Van V. Vu
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam
| | - Son Tung Ngo
- Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
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27
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Ngo ST, Nguyen TH, Tung NT, Nam PC, Vu KB, Vu VV. Oversampling Free Energy Perturbation Simulation in Determination of the Ligand‐Binding Free Energy. J Comput Chem 2019; 41:611-618. [DOI: 10.1002/jcc.26130] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 12/01/2019] [Accepted: 12/02/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Son Tung Ngo
- Laboratory of Theoretical and Computational BiophysicsTon Duc Thang University Ho Chi Minh City Vietnam
- Faculty of Applied SciencesTon Duc Thang University Ho Chi Minh City Vietnam
| | - Trung Hai Nguyen
- Laboratory of Theoretical and Computational BiophysicsTon Duc Thang University Ho Chi Minh City Vietnam
- Faculty of Applied SciencesTon Duc Thang University Ho Chi Minh City Vietnam
| | - Nguyen Thanh Tung
- Institute of Materials Science & Graduate University of Science and Technology, Vietnam Academy of Science and Technology Hanoi Vietnam
| | - Pham Cam Nam
- Department of Chemical EngineeringThe University of Da Nang, University of Science and Technology Da Nang City Vietnam
| | - Khanh B. Vu
- NTT Hi‐Tech Institute, Nguyen Tat Thanh University Ho Chi Minh City Vietnam
| | - Van V. Vu
- NTT Hi‐Tech Institute, Nguyen Tat Thanh University Ho Chi Minh City Vietnam
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28
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Vo QV, Van Bay M, Nam PC, Mechler A. Hydroxyl Radical Scavenging of Indole-3-Carbinol: A Mechanistic and Kinetic Study. ACS Omega 2019; 4:19375-19381. [PMID: 31763562 PMCID: PMC6868896 DOI: 10.1021/acsomega.9b02782] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 10/28/2019] [Indexed: 05/19/2023]
Abstract
Indole-3-carbinol (I3C) is the product of the enzymatic hydrolysis of glucobrassicin in the human body. I3C exhibits diverse bioactivities. It is used as a supplement to enhance the efficiency of some cancer therapies and is available as an over-the-counter dietary supplement described as a potential antioxidant, among other health benefits. Thus, it is important to develop an in-depth understanding of its antioxidant activity. In this study, the hydroxyl radical scavenging of I3C has been investigated in silico under physiologically relevant conditions (aqueous and lipid-mimetic pentyl ethanoate environment) using thermochemical and kinetic calculations. For benchmarking purposes, the results were compared to known experimental data. The overall reaction rate constant of the HO• radical scavenging of I3C in water was found to be 2.30 × 1010 M-1 s-1 and over two times lower in lipid-mimetic pentyl ethanoate solvent at 7.74 × 109 M-1 s-1. The results also highlighted that the HO• radical scavenging follows almost exclusively the radical adduct formation mechanism (>94%) in a lipid mimetic medium, whereas this mechanism contributes about 60% in aqueous environments. I3C is considered a dopamine-like antioxidant, its main function being prevention of oxidative degradation of lipids; our study supports this view.
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Affiliation(s)
- Quan V. Vo
- Department
for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang
University, Ho Chi
Minh City 758307, Vietnam
- E-mail:
| | - Mai Van Bay
- Department
of Chemistry, The University of Da Nang−University
of Science and Education, Da Nang 550000, Vietnam
| | - Pham Cam Nam
- Department
of Chemistry, The University of Da Nang−University
of Science and Technology, Da Nang 550000, Vietnam
| | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Melbourne Victoria 3086, Australia
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29
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Thong NM, Vo QV, Huyen TL, Bay MV, Tuan D, Nam PC. Theoretical Study for Exploring the Diglycoside Substituent Effect on the Antioxidative Capability of Isorhamnetin Extracted from Anoectochilus roxburghii. ACS Omega 2019; 4:14996-15003. [PMID: 31552341 PMCID: PMC6751718 DOI: 10.1021/acsomega.9b01780] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 08/23/2019] [Indexed: 05/27/2023]
Abstract
Radical-scavenging activity of isorhamnetin (1) and its diglycosides, named isorhamnetin-3,5'-O-β-D-diglucoside (2) and isorhamnetin-3,7-O-β-D-diglucoside (3) extracted from Anoectochilus roxburghii, has been studied through three main antioxidant pathways: hydrogen atom transfer (HAT), single electron transfer followed by proton transfer, and sequential proton loss electron transfer (SPLET). All thermodynamic parameters related to these radical-scavenging mechanisms were computed at the B3LYP/6-311G(d,p) level of theory both in the gas phase and in solution. The results suggest that HAT is the predominant mechanism in the gas phase, while SPLET is supported in an aqueous environment. In addition, the stability of radicals has also been explored by electron spin density and intramolecular hydrogen bonding. The potential energy profiles and kinetic calculations for the reactions between the selected compounds and the CH3OO• radical were calculated at 298.15 K. Among all investigated, compound 2 has the highest antioxidant activity with the lowest Gibbs free energy (-4.05 kcal/mol) and the highest hydrogen atom transfer rate constant (3.61 × 105 M-1 s-1). Substitution of the OH and OMe groups by two glucoses at the 3 and 5' sites of isorhamnetin has a significant impact on its antioxidant activity.
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Affiliation(s)
- Nguyen Minh Thong
- The
University of Danang, Campus in Kon Tum, 704 Phan Dinh Phung, Kon Tum 580000, Vietnam
| | - Quan V. Vo
- Quang Tri Teachers
Training College, Quang Tri 520000, Vietnam
| | - Trinh Le Huyen
- Department
of Applied Chemistry, National Chiao Tung
University, Hsinchu 30010, Taiwan
| | - Mai Van Bay
- Department
of Chemistry, The University of Danang,
University of Science and Education, 459 Ton Duc Thang, Da Nang 550000, Vietnam
| | - Dinh Tuan
- Department
of Chemistry, Hue University’s College
of Sciences, 77 Nguyen
Hue, Hue 530000, Vietnam
| | - Pham Cam Nam
- Department of Chemistry, The University of Danang,
University of Science and Technology, 54 Nguyen Luong Bang, Da Nang 550000, Vietnam
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30
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Quy Huong D, Duong T, Nam PC. Effect of the Structure and Temperature on Corrosion Inhibition of Thiourea Derivatives in 1.0 M HCl Solution. ACS Omega 2019; 4:14478-14489. [PMID: 31528801 PMCID: PMC6740187 DOI: 10.1021/acsomega.9b01599] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 08/13/2019] [Indexed: 05/12/2023]
Abstract
The corrosion inhibition ability of 1-phenyl-2-thiourea (PTU) and 1,3-diisopropyl-2-thiourea (ITU) for mild steel in 1.0 M hydrochloric was studied by using the potentiodynamic polarization (PDP) curves, electrochemical impedance spectroscopy (EIS), quantum chemical calculations, and Monte Carlo simulations. Conditions which influence the capacity of corrosion inhibition including concentration, structure of thiourea derivatives, and environment temperature were taken into investigation. The highest inhibition efficiencies of PTU and ITU are 98.96 and 92.65% at a concentration of 5 × 10-3 M at 60 °C. In fact, corrosion inhibition ability of PTU is better than that of ITU in acidic solution due to the presence of the benzene ring of PTU. EIS data are very well correlated with PDP results. In addition, the higher inhibition performance with enhancing temperature and the values of ΔG 0 indicated that PTU and ITU participate in chemical adsorption on the metal surface. Their adsorption process on the metal surface follow the Langmuir adsorption isotherm. Both experimental and theoretical results in this study are in good agreement.
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Affiliation(s)
- Dinh Quy Huong
- Department
of Chemistry, University of Education, Hue
University, Hue City 530000, Vietnam
| | - Tran Duong
- Department
of Chemistry, University of Education, Hue
University, Hue City 530000, Vietnam
| | - Pham Cam Nam
- Department
of Chemistry, The University of Da Nang,
University of Science and Technology, Da Nang City 550000, Vietnam
- E-mail:
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31
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Abstract
Indolinonic hydroxylamine (IH) is a new-generation artificial antioxidant that, due to its ability to fractionate into apolar environments, is considered for prevention against lipid peroxidation. For this reason, it is important to understand, and compare, its activity in polar and nonpolar environments. In this study, the antioxidant activity of IH has been evaluated against HO• and HOO• radicals in water and, for a lipid-mimetic environment, pentyl ethanoate solvent, using kinetic calculations. It was found that the overall reaction rate constant of the HO• radical scavenging is more than 7 times higher in aqueous (8.98 × 109 M-1 s-1) than in apolar (1.22 × 109 M-1 s-1) media. However, HOO• scavenging was 35 times faster in apolar media (1.00 × 105 M-1 s-1 vs 2.80 × 103 M-1 s-1). In a lipid environment, the HAT mechanism was favored for the antioxidant activity for both radical species, whereas in aqueous solution the SET mechanism defined the HO• scavenging, while HAT described the HOO• scavenging. IH was shown to be one of the most active antioxidants in lipid environment, an essential characteristic for the protection of biological systems.
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Affiliation(s)
- Quan V Vo
- Department for Management of Science and Technology Development , Ton Duc Thang University , Ho Chi Minh City 700000 , Vietnam.,Faculty of Applied Sciences , Ton Duc Thang University , Ho Chi Minh City 700000 , Vietnam
| | - Mai Van Bay
- Department of Chemistry , The University of Da Nang-University of Science and Education , Da Nang 550000 , Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering , The University of Da Nang, University of Science and Technology , Da Nang 550000 , Vietnam
| | - Adam Mechler
- Department of Chemistry and Physics , La Trobe University , Melbourne , Victoria 3086 , Australia
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32
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Huong DQ, Duong T, Nam PC. An experimental and computational study of antioxidant activity of N-phenylthiourea and N-phenylselenourea analogues. VJCH 2019. [DOI: 10.1002/vjch.201900091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dinh Quy Huong
- Department of Chemistry; Hue's University College of Education- Hue University; Hue City 530000 Viet Nam
| | - Tran Duong
- Department of Chemistry; Hue's University College of Education- Hue University; Hue City 530000 Viet Nam
| | - Pham Cam Nam
- Department of Chemistry; University of Science and Technology-The University of Danang; Danang City 550000 Viet Nam
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33
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Tung N, Derreumaux P, Vu VV, Nam PC, Ngo ST. C-Terminal Plays as the Possible Nucleation of the Self-Aggregation of the S-Shape Aβ 11-42 Tetramer in Solution: Intensive MD Study. ACS Omega 2019; 4:11066-11073. [PMID: 31460204 PMCID: PMC6648102 DOI: 10.1021/acsomega.9b00992] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 05/27/2019] [Indexed: 06/10/2023]
Abstract
Amyloid beta (Aβ) peptides are characterized as the major factors associated with neuron death in Alzheimer's disease, which is listed as the most common form of neurodegeneration. Disordered Aβ peptides are released from proteolysis of the amyloid precursor protein. The Aβ self-assembly process roughly takes place via five steps: disordered forms → oligomers → photofibrils → mature fibrils → plaques. Although Aβ fibrils are often observed in patient brains, oligomers were recently indicated to be major neurotoxic elements. In this work, the neurotoxic compound S-shape Aβ11-42 tetramer (S4Aβ11-42) was investigated over 10 μs of unbiased MD simulations. In particular, the S4Aβ11-42 oligomer adopted a high dynamics structure, resulting in unsuccessful determination of their structures in experiments. The C-terminal was suggested as the possible nucleation of the Aβ42 aggregation. The sequences 27-35 and 39-40 formed rich β-content, whereas other residues mostly adopted coil structures. The mean value of the β-content over the equilibrium interval is ∼42 ± 3%. Furthermore, the dissociation free energy of the S4Aβ11-42 peptide was predicted using a biased sampling method. The obtained free energy is ΔG US = -58.44 kcal/mol which is roughly the same level as the corresponding value of the U-shape Aβ17-42 peptide. We anticipate that the obtained S4Aβ11-42 structures could be used as targets for AD inhibitor screening over the in silico study.
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Affiliation(s)
- Nguyen
Thanh Tung
- Institute
of Materials Science, Vietnam Academy of
Science and Technology, Hanoi 10307, Vietnam
| | - Philippe Derreumaux
- Laboratory of Theoretical and Chemistry, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
- Faculty
of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
- Laboratoire
de Biochimie Theorique, UPR 9080 CNRS, IBPC, Universite Paris 7, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Van V. Vu
- NTT
Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam
| | - Pham Cam Nam
- Department
of Chemical Engineering, The University
of Da Nang—University of Science and Technology, Da Nang City 550000, Vietnam
| | - Son Tung Ngo
- Laboratory
of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang
University, Ho Chi
Minh City 758307, Vietnam
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34
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Huong DQ, Duong T, Nam PC. Experimental and theoretical study of corrosion inhibition performance of N-phenylthiourea for mild steel in hydrochloric acid and sodium chloride solution. J Mol Model 2019; 25:204. [DOI: 10.1007/s00894-019-4084-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/28/2019] [Indexed: 11/29/2022]
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35
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Vo QV, Nam PC, Thong NM, Trung NT, Phan CTD, Mechler A. Antioxidant Motifs in Flavonoids: O-H versus C-H Bond Dissociation. ACS Omega 2019; 4:8935-8942. [PMID: 31459981 PMCID: PMC6648838 DOI: 10.1021/acsomega.9b00677] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/09/2019] [Indexed: 05/10/2023]
Abstract
Flavonoids provide potential health benefits due to their antioxidant properties. The antioxidant activity of natural flavonoids is primarily exerted by phenolic hydroxyl groups; however, C-H bonds also contribute to these properties. In this study, the contributions of phenolic groups and C-H bonds to the antioxidant properties of 13 flavonoids were investigated by using the (RO)B3LYP/6-311++G(2df,2p)//B3LYP/6-311G(d,p) model chemistry in the gas phase and water and ethanol solvents. It was found that the C-H bonds have lower bond dissociation energies than O-H bonds in the 4-carbonyl and/or 3-hydroxyl group containing flavonoids and hence define antioxidant activity. The HOO· radical scavenging of the selected flavonoids is also investigated in detail through the potential energy surface, natural bond orbitals, and kinetic calculations. It was found that the favored radical scavenging mechanism of the flavonoids is hydrogen atom transfer, with the gas phase rate constants in the range of 7.23 × 103-2.07 × 109 L·mol-1·s-1. The results suggest that the flavonoids, isomelacacidin, isoteracacidin, melacacidin, and teracacidin, have antioxidant properties as high as typical phenolic compounds such as quercetin, trans-resveratrol, trolox, and ascorbic acid.
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Affiliation(s)
- Quan V. Vo
- Department
for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City 7000000, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang
University, Ho Chi
Minh City 7000000, Vietnam
| | - Pham Cam Nam
- Department
of Chemical Engineering, The University
of Danang - University of Science and Technology, Da Nang 550000, Vietnam
| | - Nguyen Minh Thong
- The
University of Danang, Campus in Kon Tum, 704 Phan Dinh Phung, Kon
Tum 580000, Vietnam
| | - Nguyen Tien Trung
- Department
of Chemistry, Quy Nhon University, Quy Nhon 591300, Vietnam
| | - Cam-Tu D. Phan
- Department
of Chemistry, Quy Nhon University, Quy Nhon 591300, Vietnam
| | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Melbourne, Victoria 3086, Australia
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36
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Vo QV, Cam Nam P, Bay MV, Minh Thong N, Hieu LT, Mechler A. A theoretical study of the radical scavenging activity of natural stilbenes. RSC Adv 2019; 9:42020-42028. [PMID: 35542856 PMCID: PMC9076562 DOI: 10.1039/c9ra08381b] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 12/11/2019] [Indexed: 12/24/2022] Open
Abstract
Oxidative stress is implicated in aging and aging-related diseases, including cancer.
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Affiliation(s)
- Quan V. Vo
- Institute of Research and Development
- Duy Tan University
- Danang 550000
- Vietnam
| | - Pham Cam Nam
- Department of Chemical Engineering
- The University of Da Nang – University of Science and Technology
- Danang 550000
- Vietnam
| | - Mai Van Bay
- Department of Chemistry
- The University of Da Nang – University of Education
- Danang 550000
- Vietnam
| | | | | | - Adam Mechler
- Department of Chemistry and Physics
- La Trobe University
- Victoria 3086
- Australia
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37
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Le HT, Thi TTV, Nam PC, Son LL, Vo QV. Isolation, Quantification and Antioxidant Activity of Extracts and Compounds from the Aerial Parts of Archidendron bauchei (Jack) I. Niels. LETT ORG CHEM 2018. [DOI: 10.2174/1570178615666180328160929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hieu Trung Le
- Department of Chemistry, Hue University of Science - Hue University, 77 Nguyen Hue, Hue, Vietnam
| | - Tran Thi Van Thi
- Department of Chemistry, Hue University of Science - Hue University, 77 Nguyen Hue, Hue, Vietnam
| | - Pham Cam Nam
- Department of Chemistry, The University of Da Nang - University of Science and Technology, - 54 Nguyen Luong Bang, Lien Chieu, Da Nang, Vietnam
| | - Le Lam Son
- Department of Chemistry, Hue University of Science - Hue University, 77 Nguyen Hue, Hue, Vietnam
| | - Quan Van Vo
- Institute of Research and Development, Duy Tan University, Da Nang, Vietnam
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38
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Affiliation(s)
- Duy Quang Dao
- Institute
of Research and Development, Duy Tan University, 03 Quang Trung, Danang 550000, Viet Nam
| | - Thi Chinh Ngo
- Institute
of Research and Development, Duy Tan University, 03 Quang Trung, Danang 550000, Viet Nam
| | - Nguyen Minh Thong
- Campus
in Kon Tum, The University of Danang, 704 Phan Dinh Phung, Kon Tum 580000, Viet Nam
| | - Pham Cam Nam
- Department
of Chemistry, The University of Da Nang−University of Science and Technology, 54 Nguyen Luong Bang, Danang 550000, Viet Nam
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39
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Ngo TC, Dao DQ, Nguyen MT, Nam PC. A DFT analysis on the radical scavenging activity of oxygenated terpenoids present in the extract of the buds of Cleistocalyx operculatus. RSC Adv 2017. [DOI: 10.1039/c7ra04798c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The antioxidant capacity of twenty-one oxygenated monoterpene and oxygenated desquiterpene compounds in the extract from Cleistocalyx operculatus has been computationally evaluated.
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Affiliation(s)
- Thi Chinh Ngo
- Institute of Research and Development
- Duy Tan University
- Danang
- Vietnam
| | - Duy Quang Dao
- Institute of Research and Development
- Duy Tan University
- Danang
- Vietnam
| | | | - Pham Cam Nam
- Department of Chemistry
- The University of Da Nang – University of Science and Technology
- Danang
- Vietnam
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40
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An NTT, Dao DQ, Nam PC, Huy BT, Nhung Tran H. Surface enhanced Raman scattering of melamine on silver substrate: An experimental and DFT study. Spectrochim Acta A Mol Biomol Spectrosc 2016; 169:230-237. [PMID: 27387126 DOI: 10.1016/j.saa.2016.06.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 06/06/2016] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Abstract
Surface enhanced Raman spectroscopy (SERS) is a powerful vibrational spectroscopy technique that allows amplifying weak Raman signals by the excitation of localized surface plasmons. In this paper, we used nanoscale roughened silver surface to enhance Raman signals of melamine analyte. Silver nanoparticles were synthesized by wet-chemical method and employed for SERS measurement. Theoretically, optimized geometries and vibrational frequencies of melamine and melamine absorbed on silver-cluster surface were calculated by using the B3LYP/6-31G(d) method. Then, the predicted spectrograms are compared with the experimental Raman spectra. As a result, Raman signals of melamine were dramatically enhanced by using obtained silver nanoparticles as the substrate. Typical peaks of melamine at 676 and 983cm(-1) were enhanced and could be obviously observed in experiments. The calculated vibrational frequencies seem to relatively coincide with the experimental values. SERS effect of melamine on nanoscale silver was also explained by analyzing molecular frontier orbitals (HOMO and LUMO) melamine-silver complexes.
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Affiliation(s)
- Nguyen Thi Thai An
- Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Danang, Viet Nam
| | - Duy Quang Dao
- Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Danang, Viet Nam.
| | - Pham Cam Nam
- Department of Chemistry, University of Science and Technology - The University of Danang, 54 Nguyen Luong Bang, Lien Chieu, Danang, Viet Nam.
| | - Bui The Huy
- Department of Chemistry, Changwon National University, Changwon 641-773, Republic of Korea
| | - Hong Nhung Tran
- Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Danang, Viet Nam
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41
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Ngo TC, Dao DQ, Thong NM, Nam PC. Insight into the antioxidant properties of non-phenolic terpenoids contained in essential oils extracted from the buds of Cleistocalyx operculatus: a DFT study. RSC Adv 2016. [DOI: 10.1039/c6ra02683d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The antioxidant properties of 21 non-phenolic terpenoids contained in essential oil extracted from the buds of Cleistocalyx operculatus have been investigated using density functional theory (DFT)-based computational methods.
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Affiliation(s)
- Thi Chinh Ngo
- Institute of Research and Development
- Duy Tan University
- Danang
- Vietnam
| | - Duy Quang Dao
- Institute of Research and Development
- Duy Tan University
- Danang
- Vietnam
| | | | - Pham Cam Nam
- Department of Chemistry
- University of Science and Technology – The University of Danang
- Danang
- Vietnam
- VN-UK
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42
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Thong NM, Quang DT, Bui NHT, Dao DQ, Nam PC. Antioxidant properties of xanthones extracted from the pericarp of Garcinia mangostana (Mangosteen): A theoretical study. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.02.033] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Thong NM, Duong T, Pham LT, Nam PC. Theoretical investigation on the bond dissociation enthalpies of phenolic compounds extracted from Artocarpus altilis using ONIOM(ROB3LYP/6-311++G(2df,2p):PM6) method. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.08.067] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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Nam PC, Chandra AK, Nguyen MT. Performance of an integrated approach for prediction of bond dissociation enthalpies of phenols extracted from ginger and tea. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2012.10.072] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45
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Gerbaux P, Dechamps N, Flammang R, Nam PC, Nguyen MT, Djazi F, Berruyer F, Bouchoux G. Gas-Phase Nitrosation of Ethylene and Related Events in the C2H4NO+ Landscape. J Phys Chem A 2008; 112:5418-28. [DOI: 10.1021/jp8011238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Pascal Gerbaux
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Noemie Dechamps
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Robert Flammang
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Pham Cam Nam
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Minh Tho Nguyen
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Fayçal Djazi
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Florence Berruyer
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
| | - Guy Bouchoux
- Laboratoire de Chimie Organique, Université de Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgique, Faculty of Chemical Engineering, University of Danang, Danang, Vietnam, Department of Chemistry, and Mathematical Modelling and Computational Science Centre (LMCC), University of Leuven, B-3001 Leuven, Belgium, Laboratoire de Physicochimie des Surfaces et Interfaces, Département des Sciences Fondamentales, Université de Skikda, BP 26, 21000 Skikda, Algérie, Laboratoire de Chimie Physique, Groupe de
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Flammang R, Dechamps N, Gerbaux P, Nam PC, Nguyen MT. The cyclohexadienylidenemethanone radical cation is a more stable distonic isomer of ionized benzaldehyde. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.03.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Cam Nam P, Nguyen MT, Zeegers-Huyskens T. Effects of fluorine-substitution on the molecular properties of dimethyl ethers: A theoretical investigation. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.06.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nam PC, Nguyen MT, Chandra AK. Theoretical Study of the Substituent Effects on the S−H Bond Dissociation Energy and Ionization Energy of 3-Pyridinethiol: Prediction of Novel Antioxidant. J Phys Chem A 2006; 110:10904-11. [PMID: 16970388 DOI: 10.1021/jp0630020] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The S-H bond dissociation enthalpies [BDE(S-H)] of a set of 5-X- and 6-X-3-pyridinethiols (X = F, Cl, CH3, OCH3, NH2, N(CH3)2, CF3, CN, and NO2) have been computed using the density functional theory based (RO)B3LYP procedure with 6-311++G(2df,2p) basis set. The effects of substituents on the BDE(S-H), proton affinity of the pyridinethiol anion [PA(S-)] and ionization energy (IE) are analyzed and their correlations with Hammett's substituent constants are examined. Subsequently, a series of 6-substituted 3-pyridinethiols have been explored to find out their antioxidant potentials. Finally, a number of 3-pyridinethiol based compounds are theoretically proposed as novel antioxidants.
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Affiliation(s)
- Pham Cam Nam
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B3001 Leuven, Belgium
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Van Hecke K, Nam PC, Nguyen MT, Van Meervelt L. Netropsin interactions in the minor groove of d(GGCCAATTGG) studied by a combination of resolution enhancement and ab initio calculations. FEBS J 2005; 272:3531-41. [PMID: 16008554 DOI: 10.1111/j.1742-4658.2005.04773.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The structure of the complex between the minor groove binder netropsin and d(GGCCAATTGG) was determined via single-crystal X-ray techniques. The structure was refined to completion using refmac5.1.24, resulting in a residual R-factor of 20.0% (including 68 water molecules). Using crystal engineering and cryocooling techniques, the resolution could be enhanced to 1.75 A, resulting in an unambiguous determination of the drug conformation and orientation. As previously noticed, bifurcated hydrogen bonds are formed between the amide nitrogen atoms of the drug and the N3 and O2 atoms of A and T base pairs, respectively, clearly cataloging the structure to class I. As the bulky NH2 group on guanine was believed to prevent binding of the drug in the minor groove, the detailed nature of several of the amidinium and guanidinium end contacts were further investigated by ab initio quantum chemical methods.
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Affiliation(s)
- Kristof Van Hecke
- Biomolecular Architecture, Chemistry Department, K.U.Leuven, Heverlee, Belgium
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