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Mukai K, Ohara A, Ito J, Hirata M, Kobayashi E, Nakagawa K, Nagaoka SI. Kinetic Study of the Quenching Reaction of Singlet Oxygen by Eight Vegetable Oils in Solution. J Oleo Sci 2019; 68:21-31. [DOI: 10.5650/jos.ess18179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Kazuo Mukai
- Department of Chemistry, Faculty of Science, Ehime University
| | - Ayaka Ohara
- Department of Chemistry, Faculty of Science, Ehime University
| | - Junya Ito
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University
| | - Masayuki Hirata
- Department of Chemistry, Faculty of Science, Ehime University
| | - Eri Kobayashi
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University
| | - Kiyotaka Nakagawa
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University
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Mukai K, Ishikawa E, Ouchi A, Nagaoka SI, Abe K, Suzuki T, Izumisawa K. Measurements of Singlet Oxygen-Quenching Activity of Vitamin E Homologs and Palm Oil and Soybean Extracts in a Micellar Solution. Lipids 2018; 53:601-613. [PMID: 30152870 DOI: 10.1002/lipd.12053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 06/01/2018] [Accepted: 06/04/2018] [Indexed: 11/07/2022]
Abstract
Recently, a new assay method that can quantify the singlet oxygen-absorption capacity (SOAC) of antioxidants (AO) and food extracts in homogeneous organic solvents has been proposed. In the present study, second-order rate constants (kQ ) for the reaction of singlet oxygen (1 O2 ) with vitamin E homologs (α-, β-, γ-, and δ-tocopherols [Toc] and α-, β-, γ-, and δ-tocotrienols [Toc-3]) were measured in an aqueous Triton X-100 (5.0 wt%) micellar solution (pH 7.4). Toc-3 showed kQ values larger than those of Toc in a micellar solution, although Toc and Toc-3 showed the same kQ values in a homogeneous solution. Similar measurements were performed for 5 palm oil extracts 1-5 and one soybean extract 6, which contained different concentrations of Toc, Toc-3, and carotenoids. It has been clarified that the 1 O2 -quenching rates (kQ ) (that is, the relative SOAC value) obtained for extracts 3-6 may be explained as the sum of the product Σ k Q AO - i AO - i / 100 of the rate constant ( k Q AO - i ) and the concentration ([AO-i]/100) of AO-i contained. The UV-vis absorption spectra of Toc and Toc-3 were measured in a micellar solution and chloroform. The results obtained demonstrated that the kQ values of AO in homogeneous and heterogeneous solutions vary notably depending on (1) polarity (dielectric constant [ε]) of the reaction field between 1 O2 and AO, (2) the local concentration of AO, and (3) the mobility of AO in solution. The results suggest that the SOAC method is applicable to the measurement of 1 O2 -quenching activity of general food extracts in a heterogeneous micellar solution.
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Affiliation(s)
- Kazuo Mukai
- Department of Chemistry, Faculty of Science, Ehime University, Matsuyama, 790-8577, Japan
| | - Eri Ishikawa
- Department of Chemistry, Faculty of Science, Ehime University, Matsuyama, 790-8577, Japan
| | - Aya Ouchi
- Department of Chemistry, Faculty of Science, Ehime University, Matsuyama, 790-8577, Japan
| | - Shin-Ichi Nagaoka
- Department of Chemistry, Faculty of Science, Ehime University, Matsuyama, 790-8577, Japan
| | - Koichi Abe
- SSCI Laboratories, Faculty of Pharmacy, Musashino University, Shinmachi 1-1-20, Nishitokyo-Shi, Tokyo, 202-0023, Japan
| | - Tomomi Suzuki
- Product Development Department, Consumer hhc Business Division, Eisai Company, Ltd., Koishikawa 5-5-5, Bunkyo-ku, Tokyo, 112-8088, Japan
| | - Katsuhiro Izumisawa
- Product Development Department, Consumer hhc Business Division, Eisai Company, Ltd., Koishikawa 5-5-5, Bunkyo-ku, Tokyo, 112-8088, Japan
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Mukai K, Ouchi A, Azuma N, Takahashi S, Aizawa K, Nagaoka SI. Development of a Singlet Oxygen Absorption Capacity (SOAC) Assay Method. Measurements of the SOAC Values for Carotenoids and α-Tocopherol in an Aqueous Triton X-100 Micellar Solution. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:784-792. [PMID: 28060496 DOI: 10.1021/acs.jafc.6b04329] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Recently, a new assay method for the quantification of the singlet oxygen absorption capacity (SOAC) of antioxidants (AOs) and food extracts in homogeneous organic solvents was proposed. In this study, second-order rate constants (kQ) for the reaction of singlet oxygen (1O2) with eight different carotenoids (Cars) and α-tocopherol (α-Toc) were measured in an aqueous Triton X-100 (5.0 wt %) micellar solution (pH 7.4, 35 °C), which was used as a simple model of biomembranes. The kQ and relative SOAC values were measured using ultraviolet-visible (UV-vis) spectroscopy. The UV-vis absorption spectra of Cars and α-Toc were measured in both a micellar solution and chloroform, to investigate the effect of solvent on the kQ and SOAC values. Furthermore, decay rates (kd) of 1O2 were measured in 0.0, 1.0, 3.0, and 5.0 wt % micellar solutions (pH 7.4), using time-resolved near-infrared fluorescence spectroscopy, to determine the absolute kQ values of the AOs. The results obtained demonstrate that the kQ values of AOs in homogeneous and heterogeneous solutions vary notably depending on (i) the polarity [dielectric constant (ε)] of the reaction field between AOs and 1O2, (ii) the local concentration of AOs, and (iii) the mobility of AOs in solution. In addition, the kQ and relative SOAC values obtained for the Cars in a heterogeneous micellar solution differ remarkably from those in homogeneous organic solvents. Measurements of kQ and SOAC values in a micellar solution may be useful for evaluating the 1O2 quenching activity of AOs in biological systems.
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Affiliation(s)
- Kazuo Mukai
- Department of Chemistry, Faculty of Science, Ehime University , Matsuyama 790-8577, Japan
| | - Aya Ouchi
- Department of Chemistry, Faculty of Science, Ehime University , Matsuyama 790-8577, Japan
| | - Nagao Azuma
- Department of Chemistry, Faculty of Science, Ehime University , Matsuyama 790-8577, Japan
| | - Shingo Takahashi
- Research & Development Division, Kagome Company Ltd. , Nasushiobara-shi, Tochigi 329-2762, Japan
| | - Koichi Aizawa
- Research & Development Division, Kagome Company Ltd. , Nasushiobara-shi, Tochigi 329-2762, Japan
| | - Shin-Ichi Nagaoka
- Department of Chemistry, Faculty of Science, Ehime University , Matsuyama 790-8577, Japan
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Morita M, Naito Y, Yoshikawa T, Niki E. Inhibition of plasma lipid oxidation induced by peroxyl radicals, peroxynitrite, hypochlorite, 15-lipoxygenase, and singlet oxygen by clinical drugs. Bioorg Med Chem Lett 2016; 26:5411-5417. [DOI: 10.1016/j.bmcl.2016.10.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 10/10/2016] [Accepted: 10/12/2016] [Indexed: 12/24/2022]
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Phenolic Melatonin-Related Compounds: Their Role as Chemical Protectors against Oxidative Stress. Molecules 2016; 21:molecules21111442. [PMID: 27801875 PMCID: PMC6274579 DOI: 10.3390/molecules21111442] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 10/17/2016] [Accepted: 10/24/2016] [Indexed: 12/22/2022] Open
Abstract
There is currently no doubt about the serious threat that oxidative stress (OS) poses to human health. Therefore, a crucial strategy to maintain a good health status is to identify molecules capable of offering protection against OS through chemical routes. Based on the known efficiency of the phenolic and melatonin (MLT) families of compounds as antioxidants, it is logical to assume that phenolic MLT-related compounds should be (at least) equally efficient. Unfortunately, they have been less investigated than phenols, MLT and its non-phenolic metabolites in this context. The evidence reviewed here strongly suggests that MLT phenolic derivatives can act as both primary and secondary antioxidants, exerting their protection through diverse chemical routes. They all seem to be better free radical scavengers than MLT and Trolox, while some of them also surpass ascorbic acid and resveratrol. However, there are still many aspects that deserve further investigations for this kind of compounds.
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Mukai K, Ishikawa E, Abe T, Ouchi A, Nagaoka SI, Murata K, Miyazawa T, Nakagawa K. Kinetic study of the quenching reaction of singlet oxygen by seven rice bran extracts in ethanol solution. Development of a singlet oxygen absorption capacity (SOAC) assay method. Biosci Biotechnol Biochem 2015. [DOI: 10.1080/09168451.2015.1069701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Abstract
Measurements of singlet oxygen (1O2) quenching rates (kQ (S)) and the relative singlet oxygen absorption capacity (SOAC) values were performed for seven rice bran extracts 1–7, which contained different concentrations of antioxidants (AOs) (such as α-, β-, γ-, and δ-tocopherols and -tocotrienols, three carotenoids (lutein, β-carotene, and zeaxanthin), and γ-oryzanol), in ethanol at 35 °C using UV–vis spectrophotometry. The concentrations of four tocopherols and four tocotrienols, three carotenoids, and γ-oryzanol contained in the extracts were determined using HPLC-MS/MS, UV-HPLC, and UV–vis absorption spectroscopy, respectively. Furthermore, comparisons of kQ (S) (Obsd.) values observed for the above extracts 1–7 with the sum of the product { [AO-i]} of the values obtained for each AO-i and the concentration ([AO-i]) of AO-i contained in extracts 1–7 were performed. From the results, it has been ascertained that the SOAC method is applicable to general food extracts to evaluate their 1O2-quenching activity.
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Affiliation(s)
- Kazuo Mukai
- Faculty of Science, Department of Chemistry, Ehime University, Matsuyama, Japan
| | - Eri Ishikawa
- Faculty of Science, Department of Chemistry, Ehime University, Matsuyama, Japan
| | - Takumi Abe
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Aya Ouchi
- Faculty of Science, Department of Chemistry, Ehime University, Matsuyama, Japan
| | - Shin-ichi Nagaoka
- Faculty of Science, Department of Chemistry, Ehime University, Matsuyama, Japan
| | - Kazumasa Murata
- Agricultural Research Institute, Toyama Prefectural Agricultural, Forestry and Fisheries Research Center, Toyama, Japan
| | - Teruo Miyazawa
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Kiyotaka Nakagawa
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
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Mukai K, Ouchi A, Abe T, Murata K, Nakagawa K, Miyazawa T. Kinetic study of the scavenging reaction of the aroxyl radical by seven kinds of rice bran extracts in ethanol solution. Development of an aroxyl radical absorption capacity (ARAC) assay method. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:11901-11909. [PMID: 25393029 DOI: 10.1021/jf503996z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Recently, a new assay method that can quantify the aroxyl radical (ArO•) absorption capacity (ARAC) of antioxidants (AOHs) was proposed. In the present work, the second-order rate constants (ks(Extract)) and ARAC values for the reaction of ArO• with seven kinds of rice bran extracts 1-7, which contain different concentrations of α-, β-, γ-, and δ-tocopherols and -tocotrienols (α-, β-, γ-, and δ-Tocs and -Toc-3s) and γ-oryzanol, were measured in ethanol at 25 °C using stopped-flow spectrophotometry. The ks(Extract) value (1.26 × 10(-2) M(-1) s(-1)) of Nipponbare (extract 1) with the highest activity was 1.5 times larger than that (8.29 × 10(-3)) of Milyang-23 (extract 7) with the lowest activity. The concentrations (in mg/100 g) of α-, β-, γ-, and δ-Tocs and -Toc-3s and γ-oryzanol found in the seven extracts 1-7 were determined using HPLC-MS/MS and UV-vis absorption spectroscopy, respectively. From the results, it has been clarified that the ArO•-scavenging rates (ks(Extract)) (that is, the relative ARAC value) obtained for the seven extracts 1-7 may be approximately explained as the sum of the product {Σ ks(AOH-i) [AOH-i]/10(5)} of the rate constant (ks(AOH-i)) and the concentration ([AOH-i]/10(5)) of AOH-i (Tocs, Toc-3s, and γ-oryzanol) included in rice bran extracts. The contribution of γ-oryzanol to the ks(Extract) value was estimated to be between 3.0-4.7% for each extract. Taken together, these results suggest that the ARAC assay method is applicable to general food extracts.
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Affiliation(s)
- Kazuo Mukai
- Department of Chemistry, Faculty of Science, Ehime University , Matsuyama 790-8577, Japan
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