Study on the extraction technology of water insoluble dietary fiber from wild apricot flesh by chemical methods and the fiber's properties

The optimum conditions of extraction technology of water-insoluble dietary fiber(IDF)from wild apricot flesh were selected by means of acid treatment,alkali treatment and both of them.Three chemical methods were compared by the orthogonal test.And the fiber's properties were compared too.The optimum parameters of the chemical extraction methods of IDF from wild apricot flesh were obtained.The optimum conditions of acid treatment were obtained as follows∶ ratio of liquid-solid 1∶ 10,concentration of acid 3%,extraction temperature 30℃,extraction time 80min.Under these conditions extraction rate was up to 25.4%,water-holding was 12.0g/g and expansibility was 6.5mL/g.The optimum conditions of alkali treatment were obtained as follows:ratio of liquid-solid 1∶ 10,concentration of alkali 10%,extraction temperature 30℃,extraction time 20min.Under these conditions extraction rate was up to 24.7%,water-holding was 13.36g/g and expansibility was 7mL/g.The optimum conditions of acid and alkali treatment were obtained as follows:alkali treatment of ratio of liquid-solid 1∶ 10,alkali treatment time 30min,concentration of alkali 10%,acid treatment of ratio of liquid-solid 1∶ 10,acid treatment time 90min.Under these conditions extraction rate was up to 16.5%,water-holding was 33.2g/g and expansibility was 10.4mL/g.