Study on extraction technology and basic characteristics of dietary fiber from Persimmon peel

The extraction technology of acid-soluble dietary fiber and alkali-soluble dietary fiber from dry Persimmon peel was studied by single factor and orthogonal experiments.The water-holding capacity and swelling property of dietary fiber were measured as well.The results showed that the optimal conditions for acid-soluble dietary fiber extraction were:adding H2SO4 solution(pH 1.0) to Persimmon peel as the solid/liquid ratio 1:12(m/v),extracting time 120min,temperature 80℃,the yield of dietary fiber was 9.57%.For alkali-soluble dietary fiber extraction were:adding 1.0% NaOH solution to the filter residue of dietary fiber treated with acid as the solid/liquid ratio 1:14(m/v),extracting time 90min,temperature 50℃,the yield of dietary fiber was 5.87%.The water-holding capacity and swelling property of acid-soluble dietary fiber were better than that of alkali-soluble dietary fiber.