Study on Extraction Technology of Water Insoluble Dietary Fiber from Carrot

[Objective] To optimize the extraction technology of water insoluble dietary fiber from carrot.[Method] By using alkali extraction method,water insoluble dietary fibers were extracted from carrot.Effects of concentration of alkali,extraction temperature,solid-liquid ratio and extraction time on the extraction rate of water insoluble dietary fibers were studied by single factor test.The optimal conditions of water insoluble dietary fiber from carrot by alkali solution extraction were researched by orthogonal test.At the same time the water holding capacity and swelling ratio were determined.[Result] The best conditions of the alkali extraction of insoluble dietary fiber were that the concentration of alkali was 4%,the extraction temperature was 70 ℃,solid-liquid ratio was 1∶20 g/ml and the extraction time was 120 minutes.At the conditions,the extraction rate of the insoluble dietary fiber was 61.28%.The water holding capacity of insoluble dietary fiber was 2.18 g/g and its swelling ratio was 3.47 ml/g.[Conclusion] The extraction technology is simple and practicable,and can be used for the extraction of water insoluble dietary fiber from carrot.