Adsorption of Calcium on Dietary Fiber from “Konatsu”, a Local Orange Grown in Kochi Prefecture

Abstract

Konatsu is a local orange grown in Kochi Prefecture, and its edible portion includes not only the flesh but also the mesocarp. The amount of total dietary fiber (DF) per 100g of the edible portion of konatsu (1.9g) was higher than that of mandarin orange (1.0g) or grapefruit (0.9g), and the ratio of insoluble to soluble DF was about 2 (konatsu), 1 (mandarin orange) and 0.3 (grapefruit). The amount of Ca adsorbed on DF from konatsu and mandarin orange at pH 8 was 45mg and 16mg, respectively, and no dissociation occurred after dilution of the suspensions. The acceptability of konatsu was high, not only for natives of Kochi Prefecture but also for non-natives.