Extractable and non-extractable polyphenols of dried persimmon 'Ichida Gaki' and their in vitro bile acid binding activity
2018
Hamauzu, Y. (Shinshu University, Kamiina-gun, Nagano (Japan). Faculty of Agriculture) | Kawabata, R.
Polyphenol content and in vitro bile acid binding activity of dried persimmon 'Ichida Gaki', procured from 6 regions of the southern part of Nagano prefecture, were investigated. The freshly processed dried 'Ichida Gaki' (100 g) contained 203 mg of extractable polyphenols, and a higher content of non-extractable polyphenols (NEPP), the yield of which was 1,002 mg by the non-destructive method and 3,854 mg by acid hydrolysis method. These values were found to be lower in the dried fruits subjected to prolonged cold storage, and having relatively lower visual quality in their color. Secondly, the bile acid binding activity of the dried 'Ichida Gaki' was strong; and the 70 % acetone insoluble solids (AIS) bound 38 μmol of bile acid molecules per gram of its weight (28% of the activity of the common sequestrant, cholestyramine). When considering AIS content, the binding activity of the flesh of dried 'Ichida Gaki' will be 432 μmol/100g. These results suggest that the bile acid binding activity is an important functional attribute of dried 'Ichida Gaki' fruits that possess a high amount of NEPP, and it might be expected to contribute to lowering cholesterol.
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