Production of resistant starch from taro {Colocasia esculenta L. Schott) corm and determination of its effects on health by in vitro methods

摘要

The aim of the study was the production of resistant starch from taro {Colocasia esculenta L. Schott) corm and determination of its effects on health by in vitro methods. Starch was isolated from taro corms with 98% purity, and 10.4 ± 0.5% amylose content. By application of heating, autoclaving, enzymatic debranch-ing, retrogradation, and drying processes to taro starch for two times, resistant starch (RS) content was increased 16 fold (35.1 ± 1.9%, dry basis). The expected glycemic index (eGI) of taro starch and taro resistant starch was determined as 60.6 ±0.5 and 51.9 ±0.9, respectively and the decrease in the glycemic index of taro resistant starch was found as statistically significant (P<0.05). The in vitro binding of bile acids by taro starch and taro resistant starch relative to cholesterol decreasing drug cholestyramine were 5.2 ± 0.2% and 7.6 ± 1.7%, respectively.