Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 58, Issue 11, Pages 6608-6613Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf100853c
Keywords
Pu-erh tea; eagle tea; radix glycyrrhizae; alpha-glucosidase; HPLC; biochemical detection
Funding
- University of Macau [UL015/09-Y1/CMS/LSP01]
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Inhibition of alpha-glucosidase is a therapeutic approach for diabetes. In this study, a method based on online liquid chromatography diode array detection tandem mass spectrometry and biochemical detection (LC-DAD-MS/MS-BCD) was developed to screen and identify alpha-glucosidase inhibitors from selected beverage extracts, including pu-erh tea (Camellia sinensis var. assamica), eagle tea (Litsea coreana Levi.), and radix glycyrrhizae (Glycyrrhiza uralensis Fisch.). As a result, two components, (-)-epigallocatechingallate (EGCG) and (-)-epicatechingallate (ECG), as potent alpha-glucosidase inhibitors, were found in pu-erh tea. The 1050 values of EGCG and ECG on alpha-glucosidase (EC 3.2.1.20, from Saccharomyces cerevisiae) were 175.1 and 246.9 mu M, respectively, and both were lower than that of acarbose (IC50 = 3553.0 mu M), a commercial alpha-glucosidase inhibitor. Kinetic studies revealed that both EGCG and ECG inhibited alpha-glucosidase activity in a noncompetitive manner. The study suggests that the developed LC-DAD-MS/MS-BCD system is a powerful tool for rapid screening and identification of alpha-glucosidase inhibitors in complex samples and that EGCG and ECG may be good candidates as alpha-glucosidase inhibitors.
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