Journal
JOURNAL OF FUNCTIONAL FOODS
Volume 25, Issue -, Pages 568-578Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jff.2016.06.035
Keywords
Lepisanthes alata; Proanthocyanidins; alpha-amylase; alpha-glucosidase; Inhibition mechanism
Categories
Funding
- National University of Singapore (Suzhou) Research Institute [R-2012-N-006]
- major grant for Industry-University Research programme of Jiangsu Province
- China Scholarship Council (CSC)
- National University of Singapore (NUS)
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Type-II diabetes has become a health threat globally. One major challenge for diabetes patients is to control their post-prandial hyperglycaemia, which could be achieved through the inhibition of a-amylase and a-glucosidase. Lepisanthes alata (Malay cherry) was discovered as a promising edible plant with high starch hydrolase inhibition activities for corn starch hydrolysis with IC50 of its aqueous extracts at 0.77 +/- 0.09 mu g/mL (for porcine alpha-amylase) and 10.83 +/- 0.67 mu g/mL (for rat intestinal alpha-glucosidase). Proanthocyanidins were identified to be responsible as active compounds. The proanthocyanidin exhibited high degree (mDP at 27) of polymerization and was composed of (epi)catechins and (epi)gallocatechins linked through B-type 4-8 interflavanyl bonds. Inhibition kinetic study revealed that the proanthocyanidins were a mixed noncompetitive inhibitor against alpha-amylase but competitive inhibitor against alpha-glucosidase. Our discovery highlighted the potential of the leaves of L. alata for use in prevention of post prandial hyperglycaemia. (C) 2016 Elsevier Ltd. All rights reserved.
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