1
|
Nakanishi I, Shoji Y, Ohkubo K, Ueno M, Shimoda K, Matsumoto KI, Fukuhara K, Hamada H. Effect of Magnesium Ion on the Radical-Scavenging Rate of Pterostilbene in an Aprotic Medium: Mechanistic Insight into the Antioxidative Reaction of Pterostilbene. Antioxidants (Basel) 2022; 11:340. [PMID: 35204222 PMCID: PMC8868536 DOI: 10.3390/antiox11020340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/03/2022] [Accepted: 02/07/2022] [Indexed: 02/01/2023] Open
Abstract
Pterostilbene (PTS), a methylated analog of resveratrol (RSV), has recently attracted much attention due to its enhanced bioavailability compared to RSV. However, little is known about the radical-scavenging mechanism of PTS. In this study, we investigated the effect of Mg(ClO4)2 on the scavenging reaction of galvinoxyl radical (GO•) by PTS in acetonitrile (MeCN). GO• was used as a model for reactive oxygen radicals. The second-order rate constant (kH) for the GO•-scavenging reaction by PTS was more than threefold larger than that by RSV, although thermodynamic parameters, such as the relative O-H bond dissociation energies of the phenolic OH groups, ionization potentials, and HOMO energies calculated by the density functional theory are about the same between PTS and RSV. The oxidation peak potential of PTS determined by the cyclic voltammetry in MeCN (0.10 M Bu4NClO4) was also virtually the same as that of RSV. On the other hand, no effect of Mg (ClO4)2 on the kH values was observed for PTS, in contrast to the case for RSV. A kinetic isotope effect of 3.4 was observed when PTS was replaced by a deuterated PTS. These results suggest that a one-step hydrogen-atom transfer from PTS to GO• may be the rate-determining step in MeCN.
Collapse
Grants
- JP18K06620 Ministry of Education, Culture, Sports, Science and Technology
- JP20H02779 Ministry of Education, Culture, Sports, Science and Technology
- JP20H04819 Ministry of Education, Culture, Sports, Science and Technology
- JP18H04650 Ministry of Education, Culture, Sports, Science and Technology
- JP17H03010 Ministry of Education, Culture, Sports, Science and Technology
- JP16H02268 Ministry of Education, Culture, Sports, Science and Technology
Collapse
Affiliation(s)
- Ikuo Nakanishi
- Quantum RedOx Chemistry Group, Institute for Quantum Life Science (iQLS), Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Inage-ku, Chiba 263-8555, Japan;
| | - Yoshimi Shoji
- Quantum RedOx Chemistry Group, Institute for Quantum Life Science (iQLS), Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Inage-ku, Chiba 263-8555, Japan;
- Quantitative RedOx Sensing Group, Department of Radiation Regulatory Science Research, National Institute of Radiological Sciences (NIRS), Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Inage-ku, Chiba 263-8555, Japan; (M.U.); (K.-i.M.)
| | - Kei Ohkubo
- Quantum RedOx Chemistry Group, Institute for Quantum Life Science (iQLS), Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Inage-ku, Chiba 263-8555, Japan;
- Institute for Advanced Co-Creation Studies, Open and Transdisciplinary Research Initiatives, Osaka University, 2-8 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Megumi Ueno
- Quantitative RedOx Sensing Group, Department of Radiation Regulatory Science Research, National Institute of Radiological Sciences (NIRS), Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Inage-ku, Chiba 263-8555, Japan; (M.U.); (K.-i.M.)
| | - Kei Shimoda
- Department of Biomedical Chemistry, Faculty of Medicine, Oita University, Yufu City, Oita 879-5593, Japan;
| | - Ken-ichiro Matsumoto
- Quantitative RedOx Sensing Group, Department of Radiation Regulatory Science Research, National Institute of Radiological Sciences (NIRS), Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology (QST), Inage-ku, Chiba 263-8555, Japan; (M.U.); (K.-i.M.)
| | - Kiyoshi Fukuhara
- School of Pharmacy, Showa University, Shinagawa-ku, Tokyo 142-8555, Japan
| | - Hiroki Hamada
- Department of Life Science, Okayama University of Science, Kita-ku, Okayama 700-0005, Japan
| |
Collapse
|
2
|
Inami K, Minami H, Hayashi T, Okayama Y, Mochizuki M. Synthesis and Radical Scavenging Activity of Substituted Dihydrobenzofuran-5-ols. HETEROCYCLES 2022. [DOI: 10.3987/com-21-14577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
4
|
Inami K, Suzuki M, Shimizu A, Furukawa M, Morita M, Mochizuki M. Substituent effect on the radical scavenging activity of 6-chromanol derivatives. RSC Adv 2014. [DOI: 10.1039/c4ra05782a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of 6-chromanol derivatives were synthesized, and their second order rate constants (k) for the reaction with galvinoxyl radical were determined. The reaction constants from the slope, which plotted with the log k versus the Hammett sigma or Taft sigma constants for the four substituents at each, were obtained.
Collapse
Affiliation(s)
- Keiko Inami
- Faculty of Pharmaceutical Sciences
- Tokyo University of Science
- Noda-shi, Japan
- Kyoritsu University of Pharmacy
- Minato-ku, Japan
| | - Mariko Suzuki
- Faculty of Pharmaceutical Sciences
- Tokyo University of Science
- Noda-shi, Japan
| | - Azusa Shimizu
- Faculty of Pharmaceutical Sciences
- Tokyo University of Science
- Noda-shi, Japan
| | | | - Mine Morita
- Kyoritsu University of Pharmacy
- Minato-ku, Japan
| | - Masataka Mochizuki
- Faculty of Pharmaceutical Sciences
- Tokyo University of Science
- Noda-shi, Japan
- Kyoritsu University of Pharmacy
- Minato-ku, Japan
| |
Collapse
|