Year : 2009  |  Volume : 1  |  Issue : 4  |  Page : 317-321

An In Vitro study on the inhibitory activities of Eugenia jambolana seeds against carbohydrate hydrolyzing enzymes

1 Department of Studies in Food Science and Nutrition, University of Mysore, Mysore, India
2 Department of Pharmaceutical Chemistry, Naragund College of Pharmacy, Dattatreya Nagar, Bangalore, India
3 Department of Pharmacology, K. L. E. S College of Pharmacy, Belgaum, India

Correspondence Address:
F Ahmed
Department of Studies in Food Science and Nutrition, University of Mysore, Mysore
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© 2009 Ahmed et al; This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: 10.4103/0975-1483.59320

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Herbal medicines have been used since prehistoric times by different cultures worldwide for treatment of diabetes. In the present investigation, the effect of untreated and heat-treated aqueous extracts from Eugenia jambolana Lam (Myrtaceae) seeds on carbohydrate hydrolyzing enzymes, namely, porcine pancreatic á-amylase, rat intestinal α-glucosidase, and sucrase, have been studied using in vitro model systems. Untreated E. jambolana extract (EJU) significantly inhibited (p ≤ 0.01) α-amylase, α-glucosidase, and sucrase activities in a dose-dependent manner, with the exception of sucrase, where the increased sample concentration did not increase the sucrase inhibitory activity. Heat treatment of the sample resulted in a significant increase (p ≤ 0.01) in the α-amylase inhibitory activity of the sample, while a marginal increase in the α-glucosidase and sucrase inhibitory activities were observed, however, they did not reach statistical significance. EJU showed IC50 values of 3.4%, and 68 and 56 ìg mL-1 for α-amylase, á-glucosidase, and sucrase, respectively, while the IC50 values for heat-treated E. jambolana extract (EJH) were 2.4%, and 66 and 54 ìg mL-1, respectively. Further, a significant correlation (p ≤ 0.01; r = 0.833) was observed between α-amylase, α-glucosidase, and sucrase inhibitory activities of both EJU and EJH. These findings emphasize that inhibition of carbohydrate hydrolyzing enzymes is one of the mechanisms through which E. jambolana exerts its hypoglycemic effect in vivo.

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