Extraction of Granular Insoluble Dietary Fiber from Apple-Roxburgh Rose Dregs

Abstract

Apple-roxburgh rose dregs are rich in insoluble dietary fiber. To prepare the granular insoluble dietary fiber from the dregs by chemical method, single-factor experiments were carried out considering such factors as the ratio of solution and dregs,the size of the dregs,NaOH concentration,the extraction temperature and time. The optimal extractions conditions were obtained by L9(34) orthogonal methodology considering such factors as the size of the dregs,NaOH concentration,the extraction temperature and time, and they were as follows:fresh dregs were extracted by 70%(v/v) at 60°C for 15 min, then dregs were dried at 70°C and powdered, dregs were sifted through 60-mesh sieve and the soluble pectin was get rid of by slight acid solution. Dregs were sifted through 40-mesh sieve and mixed with 1.0mol/L NaOH solution at the ratio of 5∶1, the mixture was kept at 60°C for 3.0h. At last, dregs were dried and powdered. The granular insoluble dietary fiber was thus prepared with the yield of 83.7%. The water holding capability and hydration capability of finished granular product are 17.0 gram water and 4.3 ml per gram product, respectively. Preparation of granular insoluble dietary fiber from apple-roxburgh rose dregs is practiced and there is a few literatures concerning this research.