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Abstract Title:

Shaddock peels (Citrus maxima) phenolic extracts inhibitα-amylase, α-glucosidase and angiotensin I-converting enzyme activities: a nutraceutical approach to diabetes management.

Abstract Source:

Diabetes Metab Syndr. 2011 Jul-Sep;5(3):148-52. Epub 2012 Mar 15. PMID: 22813568

Abstract Author(s):

Ganiyu Oboh, Ayokunle O Ademosun

Article Affiliation:

Ganiyu Oboh

Abstract:

In this study, the interactions of free and bound phenolic-rich extracts from shaddock peels (popular in folklore for the management of diabetes and hypertension) withα-amylase and α-glucosidase (key enzymes linked to type-2 diabetes) and angiotensin I-converting enzyme (ACE) (key enzyme linked to hypertension) were assessed. The free phenolics of shaddock (Citrus maxima) peels were extracted with 80% acetone, while the bound phenolics were extracted from the alkaline and acid hydrolyzed residue with ethyl acetate; and their interaction with the enzymes were assessed. The phenolic extracts inhibited α-amylase, α-glucosidase and ACE enzyme activities in a dose-dependent manner; however, bound phenolics had significantly higher (P<0.05)α-amylase inhibitory activities, than free phenolics, which had significantly higher (P<0.05) ACE inhibitory activities. There was no significant difference (P>0.05) in theirα-glucosidase inhibitory activities. The stronger inhibition of α-glucosidase when compared to α-amylase is of great pharmaceutical importance. The phenolic inhibited sodium nitroprusside induced lipid peroxidation in pancreas in a dose dependent manner. Therefore, free and bound phenolic extracts from shaddock peels could be used as nutraceutical for the management of hypertension and type-2 diabetes.

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