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Vo QV, Thuy Hoa DT, Hoa NT, Tran MD, Mechler A. The radical scavenging activity of monocaffeoylquinic acids: the role of neighboring hydroxyl groups and pH levels. RSC Adv 2024; 14:4179-4187. [PMID: 38292262 PMCID: PMC10825902 DOI: 10.1039/d3ra08460d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/23/2024] [Indexed: 02/01/2024] Open
Abstract
Caffeoylquinic acids (CQAs) are well-known antioxidants. However, a key aspect of their radical scavenging activity - the mechanism of action - has not been addressed in detail thus far. Here we report on a computational study of the mechanism of activity of CQAs in scavenging hydroperoxyl radicals. In water at physiological pH, the CQAs demonstrated ≈ 104 times higher HOO˙ antiradical activity than in lipid medium (k(lipid) ≈ 104 M-1 s-1). The activity in the aqueous solution was determined by the hydrogen transfer mechanism of the adjacent hydroxyl group (O6'-H) of the dianion states (Γ = 93.2-95.2%), while the single electron transfer reaction of these species contributed 4.8-6.8% to the total rate constants. The kinetics estimated by the calculations are consistent with experimental findings in water (pH = 7.5), yielding a kcalculated/kexperimental = 2.4, reinforcing the reliability and precision of the computational method and demonstrating its utility for evaluating radical reactions in silico. The results also revealed the pH dependence of the HOO˙ scavenging activity of the CQAs; activity was comparable for all compounds below pH 3, however at higher pH values 5CQA reacted with the HOO˙ with lower activity than 3CQA or 4CQA. It was also found that CQAs are less active than Trolox below pH 4.7, however over pH 5.0 they showed higher activity than the reference. The CQAs had the best HOO˙ antiradical activity at pH values between 5.0 and 8.6. Therefore, in the physiological environment, the hydroperoxyl antiradical capacity of CQAs exhibits similarity to renowned natural antioxidants including resveratrol, ascorbic acid, and Trolox.
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Affiliation(s)
- Quan V Vo
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | - Duong Thi Thuy Hoa
- The University of Danang - University of Sciences and Education Danang 550000 Vietnam
| | - Nguyen Thi Hoa
- The University of Danang - University of Technology and Education Danang 550000 Vietnam
| | - Manh Duc Tran
- The University of Danang - University of Sciences and Education Danang 550000 Vietnam
| | - Adam Mechler
- Department of Biochemistry and Chemistry, La Trobe University Victoria 3086 Australia
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2
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Hieu LT, Hoa NT, Mechler A, Vo QV. The Theoretical and Experimental Insights into the Radical Scavenging Activity of Rubiadin. J Phys Chem B 2023; 127:11045-11053. [PMID: 38103025 DOI: 10.1021/acs.jpcb.3c06366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
Rubiadin (RBD), an anthraquinone derivative, is obtained from Rubia cordifolia, a plant species classified under the Rubiaceae family. Rubiadin has proven beneficial properties, such as anticancer, neuroprotective, anti-inflammatory, and antidiabetic activity. The antioxidant activity of this molecule was suggested by some experimental results but has not been clearly established thus far. In this study, we employ DFT calculations to comprehensively assess the mechanism and kinetics of the HO•/HOO• radical scavenging activity of this compound in relation to solvents. RBD showed moderate HO• radical scavenging activity, with rate constants of 2.95 × 108 and 1.82 × 1010 M-1 s-1 in lipid and polar media, respectively. In the aqueous solution, the compound exhibited remarkable superoxide anion radical scavenging activity (k = 4.93 × 108 M-1 s-1) but modest HOO• antiradical activity. RBD also showed promising antiradical activity against a variety of radicals (CCl3O•, CCl3OO•, NO2, SO4•-, and N3•), while experimental and computational results confirmed that RBD has moderate activity in DPPH/ABTS•+ assays. Thus, RBD is predicted to be a good, albeit selective, radical scavenger.
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Affiliation(s)
- Le Trung Hieu
- University of Sciences, Hue University, Thua Thien Hue 530000, 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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Ngoc TD, Thi Ha MV, Le TN, Thi HV, Anh Nguyen TV, Mechler A, Hoa NT, Vo QV. A Potent Antioxidant Sesquiterpene, Abelsaginol, from Abelmoschus sagittifolius: Experimental and Theoretical Insights. ACS OMEGA 2022; 7:24004-24011. [PMID: 35847298 PMCID: PMC9280938 DOI: 10.1021/acsomega.2c02974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The sesquiterpenoid compound abelsaginol (AS) was successfully isolated from Abelmoschus sagittifolius for the first time. The compound was identified using NMR and MS data. The antioxidant activity of AS was also evaluated both theoretically and experimentally. AS was found to be a weak HOO• radical scavenger in organic solvents such as pentyl ethanoate and dimethyl sulfoxide (k overall = ∼ 102 M-1 s-1), in a good agreement with the results of the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) assay. However, AS exhibited good HOO• antiradical activity in water at pH 7.40 (k overall = 9.00 × 106 M-1 s-1) through the single-electron transfer mechanism of the anion state. Further calculations also demonstrated that AS could exert good to moderate activity against CH3O•, CH3OO•, CCl3OO•, NO2, and SO4 •- radicals, with k f values from 4.00 × 103 to 1.52 × 107 M-1 s-1. However, AS exerted much lower activity against HO•, CCl3O•, NO, O2 •-, and N3 • radicals under the studied conditions. In general, the activity of AS in water at pH 7.40 is higher than that of Trolox or butylated hydroxytoluene, which are common reference antioxidants. Thus, in an aqueous physiological milieu, AS is a promising natural antioxidant.
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Affiliation(s)
- Thuc Dinh Ngoc
- Department
of Science and Technology Management, Hong
Duc University, Thanh
Hóa, Thanh Hóa 40000, Vietnam
| | - Mai Vu Thi Ha
- Department
of Science and Technology Management, Hong
Duc University, Thanh
Hóa, Thanh Hóa 40000, Vietnam
| | - Thanh Nguyen Le
- Institute
of Marine Biochemistry (IMBC), Graduate University of Science and
Technology (GUST), Vietnam Academy of Science
and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | - Hue Vu Thi
- Institute
of Marine Biochemistry (IMBC), Graduate University of Science and
Technology (GUST), Vietnam Academy of Science
and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | - Thi Van Anh Nguyen
- University
of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | - Adam Mechler
- Department
of Biochemistry and Chemistry, La Trobe
University, Melbourne, Victoria 3086, Australia
| | - Nguyen Thi Hoa
- The
University of Danang − University of Technology and Education, Danang 550000, Vietnam
| | - Quan V. Vo
- The
University of Danang − University of Technology and Education, Danang 550000, Vietnam
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4
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Hieu LT, Van Thi TT, Hoa NT, Mechler A, Vo QV. 7-O-Galloyltricetifavan: a promising natural radical scavenger. ROYAL SOCIETY OPEN SCIENCE 2022; 9:211906. [PMID: 35754988 PMCID: PMC9214293 DOI: 10.1098/rsos.211906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 05/24/2022] [Indexed: 05/03/2023]
Abstract
7-O-Galloyltricetifavan (7OGT), a natural flavonoid, is isolated from the leaves of Pithecellobium clypearia. The compound exhibits a variety of biological activities. This study details the evaluation of the HOO• antiradical activity of 7OGT by quantum chemistry calculations. The HOO• trapping activity of 7OGT in the gas phase (reference state) was discovered to follow the formal hydrogen transfer mechanism with a rate constant of k = 4.58 × 108 M-1 s-1. In physiological environments, 7OGT is predicted to be an excellent HOO• radical scavenger with k overall = 2.65 × 108 and 1.40 × 104 M-1 s-1 in water and pentyl ethanoate solvents, respectively. The HOO• antiradical activity of 7OGT in water at physiological pH is approximately 2000 times that of Trolox and substantially higher than that of other well-known natural antioxidants such as trans-resveratrol or ascorbic acid. Thus, 7OGT is an excellent natural antioxidant in polar environments.
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Affiliation(s)
- Le Trung Hieu
- University of Sciences, Hue University, Thua Thien Hue 530000, Vietnam
| | - Tran Thi Van Thi
- University of Sciences, Hue University, Thua Thien Hue 530000, Vietnam
| | - 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
| | - Quan V. Vo
- The University of Danang – University of Technology and Education, Danang 550000, Vietnam
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5
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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] [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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Lee S, Jeong SY, Nguyen DL, So JE, Kim KH, Kim JH, Han SJ, Suh SS, Lee JH, Youn UJ. Stereocalpin B, a New Cyclic Depsipeptide from the Antarctic Lichen Ramalina terebrata. Metabolites 2022; 12:metabo12020141. [PMID: 35208215 PMCID: PMC8880677 DOI: 10.3390/metabo12020141] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/25/2022] [Accepted: 02/01/2022] [Indexed: 12/04/2022] Open
Abstract
Stereocalpin B, a new cyclic depsipeptide (1), and a new dibenzofuran derivative (3), were isolated from the Antarctic lichen, Ramalina terebrata (Ramalinaceae), along with a known cyclic depsipeptide (2). The structures of new compounds were characterized by comprehensive spectrometric analyses; high-resolution fast atom bombardment mass spectrometry (HR-FABMS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Stereocalpin B (1) existed in a rotameric equilibrium, which was confirmed using nuclear Overhauser effect spectroscopy (NOESY)/exchange spectroscopy (EXSY) spectrum. Absolute configurations of the amino acid units in 1 were assigned using the advanced Marfey’s method and subsequent NOESY analysis of the 5-hydroxy-2,4-dimethyl-3-oxo-decanoic acid residue confirmed the complete stereochemistry of 1. Compounds 1-3 exhibited moderate antimicrobial activities against E. coli, with the IC50 values ranging from 18–30 μg/mL. Compound 2 exhibited cell growth inhibition against HCT116 cell lines, with the IC50 value of 20 ± 1.20 μM, and compounds 1 and 2 also showed potent anti-inflammatory activities against lipopolysaccharide (LPS)-induced RAW264.7 macrophages with the IC50 values ranging from 5–7 μM.
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Affiliation(s)
- Seulah Lee
- Division of Life Sciences, Korea Polar Research Institute, Incheon 21990, Korea; (S.L.); (D.L.N.); (J.E.S.); (J.H.K.); (S.J.H.)
| | - Se Yun Jeong
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.Y.J.); (K.H.K.)
| | - Dieu Linh Nguyen
- Division of Life Sciences, Korea Polar Research Institute, Incheon 21990, Korea; (S.L.); (D.L.N.); (J.E.S.); (J.H.K.); (S.J.H.)
- Department of Polar Sciences, University of Science and Technology, Incheon 21990, Korea;
| | - Jae Eun So
- Division of Life Sciences, Korea Polar Research Institute, Incheon 21990, Korea; (S.L.); (D.L.N.); (J.E.S.); (J.H.K.); (S.J.H.)
- Department of Polar Sciences, University of Science and Technology, Incheon 21990, Korea;
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.Y.J.); (K.H.K.)
| | - Ji Hee Kim
- Division of Life Sciences, Korea Polar Research Institute, Incheon 21990, Korea; (S.L.); (D.L.N.); (J.E.S.); (J.H.K.); (S.J.H.)
| | - Se Jong Han
- Division of Life Sciences, Korea Polar Research Institute, Incheon 21990, Korea; (S.L.); (D.L.N.); (J.E.S.); (J.H.K.); (S.J.H.)
- Department of Polar Sciences, University of Science and Technology, Incheon 21990, Korea;
| | - Sung-Suk Suh
- Department of Bioscience, Mokpo National University, Mokpo 58554, Korea;
| | - Jun Hyuck Lee
- Department of Polar Sciences, University of Science and Technology, Incheon 21990, Korea;
- Research Unit of Cryogenic Novel Material, Korea Polar Research Institute, Incheon 21990, Korea
| | - Ui Joung Youn
- Division of Life Sciences, Korea Polar Research Institute, Incheon 21990, Korea; (S.L.); (D.L.N.); (J.E.S.); (J.H.K.); (S.J.H.)
- Department of Polar Sciences, University of Science and Technology, Incheon 21990, Korea;
- Correspondence: ; Tel.: +82-32-760-5562
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7
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Nguyen NT, Dai VV, Mechler A, Hoa NT, Vo QV. Synthesis and evaluation of the antioxidant activity of 3-pyrroline-2-ones: experimental and theoretical insights. RSC Adv 2022; 12:24579-24588. [PMID: 36128396 PMCID: PMC9425838 DOI: 10.1039/d2ra04640g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 08/22/2022] [Indexed: 11/29/2022] Open
Abstract
The heterocyclic γ-lactam ring 2-pyrrolidinone has four carbon atoms and one nitrogen atom. Among the group of derivatives of 2-pyrrolidinones, 1,5-dihydro-2H-pyrrol-2-ones, also known as 3-pyrroline-2-ones, play a significant structural role in a variety of bioactive natural compounds. In this study, three-component reactions were used to successfully synthesize six polysubstituted 3-hydroxy-3-pyrroline-2-one derivatives. The antioxidant activity of the compounds was tested by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, identifying 4-ethoxycarbonyl-3-hydroxy-5-(4-methylphenyl)-1-phenyl-3-pyrroline-2-one (4b) as the most promising radical scavenger. Quantum chemistry calculations of the thermodynamics and kinetics of the radical scavenging activity also suggest that 4b is an effective HO˙ radical scavenger, with koverall values of 2.05 × 109 and 1.54 × 1010 M−1 s−1 in pentyl ethanoate and water, respectively. On the other hand, 4b could not scavenge hydroperoxyl radicals in either media. The ability of 4b to scavenge hydroxyl radicals in polar and non-polar environments is comparable to that of conventional antioxidants such as melatonin, gallic acid, indole-3-carbinol, ramalin, or Trolox. Thus 4b may be classed as a promising HO˙ radical scavenger in the physiological environment. Derivatives of 3-hydroxy-3-pyrroline-2-one were effectively synthesized via multicomponent reactions and exhibited potential HO˙ radical scavenging activity.![]()
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Affiliation(s)
- Nguyen Tran Nguyen
- The University of Danang – University of Science and Education, Danang 550000, Vietnam
| | - Vo Viet Dai
- The University of Danang – University of Science and Education, Danang 550000, Vietnam
| | - Adam Mechler
- Department of Biochemistry and Chemistry, La Trobe University, Victoria 3086, Australia
| | - Nguyen Thi Hoa
- The University of Danang – University of Technology and Education, Danang 550000, Vietnam
| | - Quan V. Vo
- The University of Danang – University of Technology and Education, Danang 550000, Vietnam
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8
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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9
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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] [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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10
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Tam NM, Thong NM, Le Huyen T, Hoang LP, Mechler A, Vo QV. The radical scavenging activity of abietane diterpenoids: Theoretical insights. J Mol Graph Model 2021; 105:107892. [PMID: 33743519 DOI: 10.1016/j.jmgm.2021.107892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 01/15/2021] [Accepted: 03/01/2021] [Indexed: 11/29/2022]
Abstract
Salvia species are frequently used in traditional medicine and are a source of diterpenoid antioxidants. In this study, the hydroperoxide radical scavenging activity of seven known abietane diterpenoids (ADs), isolated from Salvia barrelieri, are investigated using a quantum chemical approach. The ADs are 7-oxoroyleanone-12-methyl ether (1), 7a-acetoxyroyleanone-12-methyl ether (2), royleanone (3), horminone (4), 7-acetylhorminone (5), cryptojaponol (6), and inuroyleanol (7). It was found that formal hydrogen transfer is the main mechanism of the antiradical activity of these ADs in nonpolar environments, whereas the single electron transfer mechanism of anion states is favored in aqueous environment. The antioxidant activity of compounds 1-5 involves H-abstraction at the C7(15)-H bonds whereas for the compounds 6 and 7 the H abstraction takes place at the O12-H bond. The HOO• scavenging activity of compounds 1-5 is minor in all of the studied media, however 6 and 7 exhibit excellent antiradical activity in aqueous solution. Remarkably, the HOO• scavenging activity of compound 7 is substantially higher than that of Trolox, the reference antioxidant: the calculated rate constant was 122.3 times higher in polar and 6.1 times higher in nonpolar environments, respectively. Consistently 7 is a promising radical scavenger in physiological environments.
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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
| | - 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 and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - 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
- Faculty of Chemical Technology- Environment, The University of Danang - University of Technology and Education, Danang 550000, Vietnam.
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11
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Vo QV, Van LTN, Hoa NT, Mechler A. Modelling the mechanism and kinetics of the radical scavenging activity of iminostilbene. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2021.109483] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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12
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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: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [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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Vo QV, Hoa NT. The radical scavenging activity of moracins: theoretical insights. RSC Adv 2020; 10:36843-36848. [PMID: 35517966 PMCID: PMC9057055 DOI: 10.1039/d0ra06555b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 09/30/2020] [Indexed: 11/21/2022] Open
Abstract
Moracins are natural products that have been isolated from different plants such as Artocarpus heterophyllus, Cassia fistula, Morus alba, and Morus mesozygia. Studies showed that moracins may have various advantageous physiological effects such as anticancer, anti-inflammatory, anticholinesterase and particularly antioxidant activities. Most of these bioactivities have not been studied systematically. In this study, the radical scavenging of a typical moracin (moracin M, MM) against HO˙ and HOO˙ radicals was evaluated by thermodynamic and kinetic calculations in the gas phase as well as in water and pentyl ethanoate solvents. It was found that the overall rate constants for the HO˙ radical scavenging in the gas phase and the physiological environments are in the range of 1011 to 1010 M-1 s-1, respectively. For the HOO˙ + MM reaction the rate constants are 4.10 × 107 and 3.80 × 104 M-1 s-1 in the polar and lipid media, respectively. It is important to notice that the single electron transfer pathway of the anion state (MM-O6'-) dominated the HOO˙ radical scavenging in the aqueous solution, whereas in lipid medium the neutral MM exerted its activity by the formal hydrogen transfer mechanism. The HOO˙ radical scavenging of MM is comparable to that of Trolox in lipid medium, whereas it is 315.4 times more active in the polar environment.
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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
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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] [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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Hoa N, Van Bay M, Mechler A, Vo QV. Is Usnic Acid a Promising Radical Scavenger? ACS OMEGA 2020; 5:17715-17720. [PMID: 32715258 PMCID: PMC7377319 DOI: 10.1021/acsomega.0c02306] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 06/22/2020] [Indexed: 05/03/2023]
Abstract
Usnic acid (UA) is a natural product found in the lichen genera. Because of the phenolic groups in its structure, UA is suspected to be an antioxidant. Therefore, in this study, the radical scavenging of UA was investigated in physiological environments in silico by using kinetic calculations. It was found that the overall rate constant for the hydroxyl radical scavenging activity was approximately 109 M-1 s-1 in all environments, whereas the HOO• and CH3OO• radical scavenging activities were only significant in the polar environments with k in the range of 103-104 M-1 s-1. The results also revealed that the HO• scavenging activity followed the single electron transfer (SET) and radical adduct formation mechanisms; however, the SET pathway (for the dianion HU2-) played a dominant role in the scavenging of other studied radicals, including CH3O•, CCl3O•, CCl3OO•, NO2, SO4 •-, and N3 •. The activity of UA against these radicals was as high as that of typical phenolic acids such as ferulic acid, p-coumaric acid, caffeic acid, dihydrocaffeic acid, and sinapinic acid (k f ∼ 108 M-1 s-1) in polar solvents. Thus, UA is a promising natural antioxidant in aqueous environments.
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Affiliation(s)
- Nguyen
Thi Hoa
- Academic
Affairs, The University of Danang—University
of Technology and Education, 48 Cao Thang, Danang 550000, Vietnam
| | - Mai Van Bay
- Department
of Chemistry, The University of Danang—University
of Science and Education, 48 Cao Thang, Danang 550000, Vietnam
| | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Victoria 3086, Australia
| | - Quan V. Vo
- Institute
of Research and Development, Duy Tan University, Danang 550000, Vietnam
- Faculty
of Chemical Technology-Environment, The
University of Danang—University of Technology and Education, 48 Cao Thang, Danang 550000, Vietnam
- ,
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Boulebd H, Mechler A, Hoa NT, Vo QV. Thermodynamic and kinetic studies of the antiradical activity of 5-hydroxymethylfurfural: computational insights. NEW J CHEM 2020. [DOI: 10.1039/d0nj01567a] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The antiradical properties of 5-HMF in the gas-phase and in physiological environments were examined by thermodynamic and kinetic calculations.
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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
- Australia
| | - Nguyen Thi Hoa
- Academic Affairs
- The University of Danang – University of Technology and Education
- Danang 550000
- Vietnam
| | - Quan V. Vo
- Institute of Research and Development
- Duy Tan University
- Danang 550000
- Vietnam
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