Optimal reaction conditions and radical scavenging activities for the bioconversion of green tea using tannase

Yang Hee Hong, You Kyung Yeon, Eun Young Jung, Kwang Soon Shin, Kwang Won Yu, Tae Young Kim, Hyung Joo Suh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, we optimized the reaction conditions for the bioconversion of green tea using tannase, and to evaluate its radical scavenging activities. Tea catechins such as (-)-epigallocatechin gallate (EGCG) or (-)-epicatechin gallate (ECG) were hydrolyzed by tannase to produce (-)-epigallocatechin (EGC) or (-)-epicatechin (EC), respectively, and a common product, gallic acid. The bioconversion of tea catechins by tannase was increased as enzyme concentration, substrate concentration and incubation time for enzyme dose. The results indicated the optimum reaction conditions for tannase were tannase 30 U/mL (enzyme concentration) on 1% green tea (substrate concentration) for 1 hr (incubation time for enzyme). Tannase enhanced the radical-scavenging properties of green tea; the 2,2-azinobis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals scavenging abilities were significantly (p<0.001) greater for the tannase-treated green tea extract compared to the untreated green tea extract. It is reported that ECG has the greatest antioxidant activity among the catechins in green tea, and the release of gallic acid is considered to be beneficial because of its significant antioxidant potency. The results of this study suggest that the tannase-treated green tea increases antioxidant activities under optimum reaction conditions.

Original languageEnglish
Pages (from-to)1501-1506
Number of pages6
JournalJournal of the Korean Society of Food Science and Nutrition
Volume40
Issue number11
DOIs
Publication statusPublished - 2011 Dec 1

Fingerprint

tannase
green tea
Tea
biotransformation
epicatechin
flavanols
Catechin
epigallocatechin
Gallic Acid
enzymes
Antioxidants
gallic acid
Enzymes
tea
antioxidant activity
sulfonic acid
extracts
Sulfonic Acids

Keywords

  • Bioconversion
  • Catechins
  • Green tea
  • Radical scavenging activity
  • Tannase

ASJC Scopus subject areas

  • Nutrition and Dietetics
  • Food Science

Cite this

Optimal reaction conditions and radical scavenging activities for the bioconversion of green tea using tannase. / Hong, Yang Hee; Yeon, You Kyung; Jung, Eun Young; Shin, Kwang Soon; Yu, Kwang Won; Kim, Tae Young; Suh, Hyung Joo.

In: Journal of the Korean Society of Food Science and Nutrition, Vol. 40, No. 11, 01.12.2011, p. 1501-1506.

Research output: Contribution to journalArticle

Hong, Yang Hee ; Yeon, You Kyung ; Jung, Eun Young ; Shin, Kwang Soon ; Yu, Kwang Won ; Kim, Tae Young ; Suh, Hyung Joo. / Optimal reaction conditions and radical scavenging activities for the bioconversion of green tea using tannase. In: Journal of the Korean Society of Food Science and Nutrition. 2011 ; Vol. 40, No. 11. pp. 1501-1506.
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