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Tannase application in secondary enzymatic processing of inferior Tieguanyin oolong tea
- Source :
- Electronic Journal of Biotechnology, Vol 28, Iss C, Pp 87-94 (2017)
- Publication Year :
- 2017
- Publisher :
- Elsevier, 2017.
-
Abstract
- Background: Inferior Tieguanyin oolong tea leaves were treated with tannase. The content and bioactivity of catechins in extracts from the treated tea leaves were investigated to assess the improvement in the quality of inferior Tieguanyin oolong tea. Results: Analysis showed that after treatment, the esterified catechin content decreased by 23.5%, whereas non-galloylated catechin and gallic acid contents increased by 15.3% and 182%, respectively. The extracts from tannase-treated tea leaves showed reduced ability to bind to BSA and decreased tea cream levels. The extracts also exhibited increased antioxidant ability to scavenge OH and DPPH radicals, increased ferric reducing power, and decreased inhibitory effects on pancreatic α-amylase and lipase activities. Conclusions: These results suggested that tannase treatment could improve the quality of inferior Tieguanyin oolong tea leaves.
Details
- Language :
- English
- ISSN :
- 07173458
- Volume :
- 28
- Issue :
- C
- Database :
- Directory of Open Access Journals
- Journal :
- Electronic Journal of Biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.13d6b467db0400e92ea43895804a935
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.ejbt.2017.05.010