豆渣可溶性膳食纤维的提取及其制备可食用膜的研究

Study on Extraction of Soluble Dietary Fiber from Soybean Dregsand Preparation of Edible Film

豆渣是大豆加工的大宗副产物,富含膳食纤维。采用微波辅助酶解水提法提取豆渣可溶性膳食纤维(SDF),然后将其制成可食用膜。通过单因素试验和正交试验优化后的提取工艺参数为水料比25∶1(mL/g)、纤维素酶添加量3%、水解时间2 h,此条件下豆渣SDF提取率为18.65%。然后通过正交试验优化了用豆渣SDF制备可食用膜的配方为SDF 1.0 g、甘油4.5 g、CMC 1.0 g、海藻酸钠1.5 g。用最优配方制备的可食用膜具有良好的性能:膜厚度0.032 mm、透明度13.26%、溶解速度25 s/g、水蒸气透过系数0.61 g·mm/m^(2)·d·kPa、透油系数4.15 g·mm/m^(2)·d。该研究可为豆渣的深加工提供方法参考,所制备的可食用膜有望用于食品加工、包装行业。

Soybean dregs are the main by-products of soybean processing,and are rich in dietary fiber.Soluble dietary fiber(SDF)is extracted from soybean dregs by microwave-assisted enzymatic hydrolysis and water extraction method,and then it is made into edible film.The extraction process parameters optimized by single factor test and orthogonal test are as follows:water-material ratio is 25∶1(mL/g),cellulase addition amount is 3%and hydrolysis time is 2 h.Under these conditions,the extraction rate of SDF from soybean dregs is 18.65%.The formula of edible film prepared by soybean dreg SDF is optimized by orthogonal test:1.0 g SDF,4.5 g glycerol,1.0 g CMC and 1.5 g sodium alginate.The edible film prepared by the optimal formula has good properties:the film thickness is 0.032 mm,the transparence is 13.26%,the dissolution rate is 25 s/g,the water vapor transmission coefficient is 0.61 g·mm/m^(2)·d·kPa,and the oil transmission coefficient is 4.15 g·mm/m^(2)·d.This study can provide method references for the deep processing of soybean dregs,and the prepared edible film is expected to be used in food processing and packaging industries.