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Technical Brief

Inhibition of Polyphenol Oxidase by Quercetin Derivatives in Grape Skin

Tohru Okuda, Emiko Kawai, Jun Harada, Eri Inoue, Masashi Hisamoto, Fumie Watanabe-Saito
Am J Enol Vitic. January 2019 70: 109-113; published ahead of print July 05, 2018 ; DOI: 10.5344/ajev.2018.17115
Tohru Okuda
1The Institute of Enology and Viticulture, Interdisciplinary Graduate School of Life and Environmental Sciences, University of Yamanashi, 13-1 Kitashin-1-Chome, Kofu, Yamanashi 400-0005, Japan
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  • For correspondence: okuda@yamanashi.ac.jp
Emiko Kawai
1The Institute of Enology and Viticulture, Interdisciplinary Graduate School of Life and Environmental Sciences, University of Yamanashi, 13-1 Kitashin-1-Chome, Kofu, Yamanashi 400-0005, Japan
2Current Address: Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-0845, Japan
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Jun Harada
1The Institute of Enology and Viticulture, Interdisciplinary Graduate School of Life and Environmental Sciences, University of Yamanashi, 13-1 Kitashin-1-Chome, Kofu, Yamanashi 400-0005, Japan
3Current address: Vins Coeur & Co., 1-4-5 Uchikanda, Chiyoda, Tokyo 101-0047, Japan.
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Eri Inoue
1The Institute of Enology and Viticulture, Interdisciplinary Graduate School of Life and Environmental Sciences, University of Yamanashi, 13-1 Kitashin-1-Chome, Kofu, Yamanashi 400-0005, Japan
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Masashi Hisamoto
1The Institute of Enology and Viticulture, Interdisciplinary Graduate School of Life and Environmental Sciences, University of Yamanashi, 13-1 Kitashin-1-Chome, Kofu, Yamanashi 400-0005, Japan
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Fumie Watanabe-Saito
1The Institute of Enology and Viticulture, Interdisciplinary Graduate School of Life and Environmental Sciences, University of Yamanashi, 13-1 Kitashin-1-Chome, Kofu, Yamanashi 400-0005, Japan
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Abstract

Polyphenol oxidase (PPO) inhibitors were isolated from grape skin and identified as quercetin derivatives. Among the inhibitors isolated, quercetin-3-glucoside (Q3Glc) was the most potent. Kinetic analysis of the inhibitory activity toward PPO was carried out with authentic Q3Glc using catechol as substrate. The inhibition was reversible, the inhibitory mechanism obtained from Lineweaver-Burk plots indicated that Q3Glc is a competitive inhibitor, and the inhibitory constant (Ki) was 84.6 µM.

  • grape
  • inhibition
  • kinetics
  • polyphenol oxidase
  • quercetin-3-glucoside
  • skin
  • Received December 2017.
  • Revision received June 2018.
  • Accepted June 2018.
  • ©2019 by the American Society for Enology and Viticulture
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Inhibition of Polyphenol Oxidase by Quercetin Derivatives in Grape Skin
Tohru Okuda, Emiko Kawai, Jun Harada, Eri Inoue, Masashi Hisamoto, Fumie Watanabe-Saito
Am J Enol Vitic.  January 2019  70: 109-113;  published ahead of print July 05, 2018 ; DOI: 10.5344/ajev.2018.17115

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Inhibition of Polyphenol Oxidase by Quercetin Derivatives in Grape Skin
Tohru Okuda, Emiko Kawai, Jun Harada, Eri Inoue, Masashi Hisamoto, Fumie Watanabe-Saito
Am J Enol Vitic.  January 2019  70: 109-113;  published ahead of print July 05, 2018 ; DOI: 10.5344/ajev.2018.17115
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