高温高压挤出处理对玉米皮膳食纤维溶解特性及物性的影响

以高温高压挤出处理的玉米皮为原料提取玉米皮水溶性膳食纤维(S-CDF)、玉米皮水不溶性膳食纤维(I-CDF)[玉米皮酸不溶性膳食纤维(ACI-CDF)、玉米皮碱不溶性膳食纤维(ALI-CDF)]，研究挤出前后玉米皮膳食纤维(CDF)溶解特性和物性变化，并对玉米皮水溶性膳食纤维与水不溶性膳食纤维不同比例混合后的物性进行分析。结果表明：在料液比为1:1.5，温度为165℃，喂料速度为15kg/h条件时挤出改性处理最佳，S-CDF提取率提高了68.74%，CDF的溶解性以及S-CDF、I-CDF、ACI-CDF和ALI-CDF的膨胀力、持水力等物性值得到显著提高。玉米皮可溶性膳食纤维与不溶性膳食纤维比例为1:4时物性最佳。

Effect of High-Temperature-High-Pressure Extrusion on Solubility and Physical Properties of Corn Spermoderm Dietary Fiber

Water soluble dietary fiber (S-CDF), water insoluble dietary fiber (I-CDF)(acid insoluble dietary fiber (ACI-CDF) and alkaline insoluble fiber (ALI-CDF)) were extracted from high-temperature-high-pressure-extruded corn spermoderm. Solubility and physical properties of each of these CDFs and mixtures at different ratios of S-CDF to I-CDF were analyzed before and after high-temperature-high-pressure extrusion. The results showed that extrusion at 165 ℃, a material-to-liquid ratio of 1:1.5 and a feed speed of 15 kg/h proved optimal. Under these extrusion conditions, the extraction yield of S-CDF was increased by 68.74%, the expansibility, water-holding capacity and solubility of S-CDF, I-CDF, ACI-CDF and ALI-CDF were distinctly increased. When expansibility, cation exchange capacity, water-holding capacity, oil-holding capacity and water-binding capacity were comprehensively considered, the optimal S-CDF to I-CDF ratio was 1:4.