玉米芯不溶性膳食纤维制备工艺的研究

以玉米芯为原料，采用酸碱结合法提取不溶性膳食纤维，对提取过程中酸、碱用量和反应时间进行优化。结果表明：玉米芯在料液比1∶10（g∶mL），反应温度95 ℃，硫酸体积分数2.0%条件下提取40 min，漂洗后，再于料液比1∶10（g∶mL），反应温度95 ℃，NaOH质量浓度2.0 g/100 mL条件下提取60 min，可制得膨胀力为4.1 mL/g，持水力为5.1 g/g的终产品。产物的蛋白质、淀粉含量显著降低，分别为0.7 g/100 g、7.4 g/100 g，吸油性能有显著提升，为2.3 g/100 g，还原能力略有下降，A700 nm为0.327。

Preparation technology of insoluble dietary fiber from corn cob

The acid-alkaline based extraction technology of insoluble dietary fiber from corn cob was studied. The effects of acid addition, alkaline addition and their reaction times were investigated. The results showed that the corn cob was extracted by 2.0% H2SO4 under the solid-liquid ratio 1∶10 (g∶ml), temperature 95 ℃ and extraction time 40 min. After being washed, the corn cob was extracted by 2.0 g/100 ml NaOH under the solid-liquid ratio 1∶10 (g∶ml), temperature 95 ℃ and extraction time 60 min. On these conditions, the expansibility capacity of the product was 4.1 ml/g, and the water-holding capacity was 5.1 g/g. There was a significant decrease of the product in the contents of protein and starch, which was 0.7 g/100 g and 7.4 g/100 g, respectively. And there was a significantly increase in oil binding capacity, which was 2.3 g/100 g, meanwhile, the reducing power decreased slightly, and the A700 nm was 0.327.