木聚糖酶结合微粉法改性米糠膳食纤维

Modify the Micronized Rice Bran Dietary Fiber with Xylanase

用木聚糖酶对经过超微粉碎处理后的DRBDF水解使其改性,增加其中可溶性膳食纤维的含量。以可溶性膳食纤维的得率为指标,通过单因素试验和正交试验对改性条件进行优化,以确定最佳的改性工艺。结果表明,在木聚糖酶添加量30 FXU/g,酶解p H值4.5,酶解温度50℃,酶解时间3 h,粒径范围100~150μm时,可溶性膳食纤维的得率最高,达到7.13%。经过改性后的米糠膳食纤维,其持水力、持油力分别为改性前的1.18倍和2.04倍,溶胀力降低为原来的79%。

For increasing the content of soluble dietary fibre（SDF）, the micronized rice bran dietary fiber is modified with xylanase. According to the yield of SDF, the technology of modification is optimized by the means of single factor test and orthogonal test. The results show that the SDF yield is up to 7.13% under a suitable condition：addition of 30 FXU/g xylanase per gram DRBDF, p H 4.5, hydrolysis temperature 50 ℃, time 3 h and range of particle size 100~150 μm. WHC and OHC of TDF are 1.18 times and 2.04 times that of DRBDF respectively,and SC decreas by 79%.