Abstract
α-Glucosidase inhibitory activities of the various solvent fractions (n-hexane, CHCl3 , EtOAc, BuOH, and water) of sea cucumber internal organ were investigated. 1,3-Dipalmitolein (1) and cis-9-octadecenoic acid (2) with potent α-glucosidase inhibitory activity were purified from the n-hexane fraction of sea cucumber internal organ. IC50 values of compounds 1 and 2 were 4.45 and 14.87 μM against Saccharomyces cerevisiae α-glucosidase. These compounds mildly inhibited rat-intestinal α-glucosidase. In addition, both compounds showed a mixed competitive inhibition against S. cerevisiae α-glucosidase and were very stable at pH 2 up to 60 min. The KI values of compounds 1 and 2 were 0.48 and 1.24 μM, respectively. Therefore, the internal organ of sea cucumber might be a potential new source of α-glucosidase inhibitors suitably used for prevention of obesity and diabetes mellitus.
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