碳酸钠和盐酸法提取荞麦壳中水不可溶性膳食纤维的对比研究

为提高荞麦壳利用率并且探究最佳的提取条件及增加其利用形式,本文以荞麦壳为原料,分别采用碳酸钠浸泡法和盐酸酸提法对荞麦壳中的水不可溶性膳食纤维(IDF)进行提取。结果表明,碳酸钠提取荞麦壳IDF的最佳工艺为碱解温度60℃,Na2CO3质量分数为10%,碱解时间40 min,料液比为1∶13 g/mL,荞麦壳IDF的得率为82.75%,膨胀力为6.87 mL/g,持水力为379.18%。HCl酸提法提取荞麦壳IDF的最佳工艺条件为pH为2,酸浸温度为60℃,酸提时间为100 min,料液比为1∶15 g/mL。荞麦壳IDF的得率为86.00%,膨胀力5.92 mL/g,持水力为365.31%。在最佳工艺条件下,盐酸法提取的IDF得率略高于碳酸钠法,但碳酸钠法提取的IDF具有更好的膨胀力和持水力等水合性能。

Comparative Analysis of Insoluble Dietary Fiber from Buckwheat Hull Extracted by Sodium Carbonate and Hydrochloric Acid

The buckwheat husk was as raw material, and sodium carbonate soaking method and hydrochloric acid extraction method were used to extract insoluble dietary fiber (IDF) from buckwheat hull.The results showed that the best process for extracting buckwheat hull IDF with sodium carbonate was:The alkali hydrolysis temperature was 60℃, Na₂CO₃ mass fraction was 10%, alkali hydrolysis time was 40 min, solid-liquid ratio was 1:13 g/mL.Under these conditions, the yield of buckwheat hull IDF was 82.75%, swelling force was 6.87 mL/g, water holding capacity was 379.18%. The optimal conditions for the extraction of buckwheat hull IDF with hydrochloric acid extraction were pH2, acid leaching temperature 60℃, acid extraction time 100 min, and solid-liquid ratio 1:15 g/mL. The yield of buckwheat hull IDF was 86.00%, the swelling force was 5.92 mL/g, and the water holding capacity was 365.31%. Under the best process conditions, a direct comparison showed that the yield obtained by the hydrochloric acid method was slightly higher than that of the sodium carbonate method, but the obtained IDF was inferior to the sodium carbonate method in terms of hydration performance such as expansion force and water holding capacity.