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Effects of tea polyphenols and different teas on pancreatic α-amylase activity in vitro.
- Source :
-
LWT - Food Science & Technology . Mar2016, Vol. 66, p232-238. 7p. - Publication Year :
- 2016
-
Abstract
- The effects of tea polyphenols (TP) and different types of teas (green, black and oolong tea) processed from the same fresh leaves on pancreatic α-amylase activity were studied using potato starch and cooked potato as substrates. The results showed that, with the both substrates, low concentration of TP significantly increased α-amylase activity while high concentration inhibited it by non-competitive fashion. In addition, the extents of enzymatic activation and inhibition were different when TP was pre-incubated with α-amylase or starch, respectively. The interaction of TP with enzyme/starch led to decreased antioxidant capacity. Results also showed that all the three types of teas significantly enhanced α-amylase activity for a wide range of concentrations (0.34–27.14 mg/mL), and green tea showed the highest activation effect. It is concluded that high concentration of TP exhibits mild inhibitory effect against α-amylase, while green tea, black tea and oolong tea enhance α-amylase activity, which may be due to other constituents in the tea, enhancing α-amylase activity that counteracts the inhibitory effect of TP. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00236438
- Volume :
- 66
- Database :
- Academic Search Index
- Journal :
- LWT - Food Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 111569279
- Full Text :
- https://doi.org/10.1016/j.lwt.2015.10.035