The process optimization and performance comparisons of insoluble dietary fiber extracted from Zizania latifolia

The dietary fiber was sxtracted from the Zizania latifolia by using chemical method and enzymic method.The orthogonal experiment result showed that the optimal conditions for acid method to extract insoluble dietary fiber were ratio of solid to liquid 1 ∶ 10, temperature 70℃, time 60 min, p H4. The yield was 51.45%. The optimal conditions for alkaline extraction were emperature 80℃, time 120 min, p H11. The yield was 59.12%. The optimal conditions for enzymic method were ratio of solid to liquid 1∶10, time 10 min, α- amylase dosage 0.3%.The yield was52.18%.The expansion capacity and water holding capacity of enzymic method extraction were strongest, 4.25 g / g, 8.20 m L / g respectively.The property of acid method to extract was the worst, 3.53 g / g, 3.90 m L / g respectively.