Catechine biotransformation by tannase with sequential addition of substrate
- Authors
- Noh, Dong Ouk; Choi, Hyeon-Son; Suh, Hyung Joo
- Issue Date
- 2월-2014
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Tannase; Green tea extract; EGCG; EGC; Sequential addition
- Citation
- PROCESS BIOCHEMISTRY, v.49, no.2, pp.271 - 276
- Indexed
- SCIE
SCOPUS
- Journal Title
- PROCESS BIOCHEMISTRY
- Volume
- 49
- Number
- 2
- Start Page
- 271
- End Page
- 276
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/99433
- DOI
- 10.1016/j.procbio.2013.11.001
- ISSN
- 1359-5113
- Abstract
- This work studied the effect of a sequential addition of substrate on tannase reaction for the increase of epigallocatechin (EGC) and gallic acid. The addition of 0.5-1% GTE increased the production of gallic acid during 2 h in a single tannase reaction, while the addition of more than 2% in GTE rather showed a decrease in gallic acid level with an increase of EGCG level compared with 1% GTE addition group, suggesting that GTE addition of 2% and over inhibits the reaction of tannase. Examination of sequential addition of 1% GTE on tannase reaction showed that second addition of 1% GTE at 2h promoted tannase reaction by increasing production of gallic acid, but further addition (2 and 3 h) rather inhibited tannase reaction with lowered gallic acid and enhanced EGCG levels. This result showed that one additional treatment of 1% GTE during tannase reaction is effective in an increase of gallic acid production. Moreover, levels of degallated products including EGC, EC, and GC were increased by 7.3, 4.5, and 3.5-fold, respectively in sequential addition of GTE at 2 h. pH change derived from gallic acid production was not shown to related to tannase activity. Therefore, our study suggests that one sequential addition is a suitable process for desirable production of green tea extracts enriched in active components such as gallic acid and EGC. (c) 2013 Elsevier Ltd. All rights reserved.
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