红薯渣中不溶性膳食纤维提取工艺的优化

Research on extraction and property of the water insoluble dietary fiber from sweet potato

[目的]优化红薯渣中不溶性膳食纤维的提取工艺,以提高红薯渣的综合利用。[方法]以红薯渣为原料,利用碱化学法制备不溶性膳食纤维,研究料液比、碱浓度、提取时间和提取温度对不溶性膳食纤维提取率的影响,由正交实验确定红薯渣中不溶性膳食纤维的最佳提取工艺。[结果]在料液比为1∶6,碱浓度为10.0g·L^(-1),提取温度为75℃,提取时间为45min的条件下,红薯渣中不溶性膳食纤维的提取率为70.25%,持水力为4.16g·g^(-1),溶胀性为20.6mL·g^(-1)。[结论]碱化学法可有效提取红薯渣中的不溶性膳食纤维。

[Objective]In order to propel comprehensive utilization of sweet potato residue,the extraction process of the water insoluble dietary fiber from sweet potato residue was studied.[Methods]The alkali solution was used to extract the water insoluble dietary fiber from sweet potato residue.With the solid-liquid ratio,alkali concentration,extraction time and extraction temperature for single-factor experiments,the best extraction condition of the water insoluble dietary fibre was determined by orthogonal experiment.[Results]The results showed the best extraction condition of the water insoluble dietary fibre was the ratio of material to water 1∶6,alkali concentration 10.0g·L^-1,the extraction temperature 75 ℃,the extraction time 45 min.The extraction ratio of the water insoluble dietary fiber was 70.25%.The water holding was 4.16g·g^-1,and the expansibility was 20.6mL·g^-1.[Conculusion]Alkali extraction of the water insoluble dietary fiber from sweet potato residue was effective.