大豆水溶性膳食纤维的提取研究

Study on the Extraction of Soybean Soluble Dietary Fiber

本文研究了常压和加压预处理条件下豆渣中水溶性膳食纤维(SDF)的提取工艺。研究表明常压下豆渣中水溶性膳食纤维提取的最佳工艺条件为:2%六偏磷酸钠溶液、pH值6.5、料液比1:30、反应温度60℃、反应时间2h;加压预处理大大提高了可溶性纤维的提取率,最佳提取条件为:处理温度120℃、pH值5.7、处理时间3.5h。在此工作的基础上,采用膜分离技术和喷雾干燥等技术,并进行了中试生产,大大降低了成本,而且产品质量更好,从而使之具有非常良好的产业化应用前景。豆粕提取大豆蛋白之后所剩余的纤维适合于生产SDF,SDF提取得率超过了原料的43.0%。

The extraction technology of soluble dietary fiber from soybean dregs was investigated under room pressure and by pressurized pre-treatment. It was found that, for the extraction under room pressure, the best concentration of sodium hexameta phosphate solution, pH value, ratio of solid to liquid, temperature＇ and extraction time were 2%, 6.5, 1：30, 60 ℃ and 2h, respectively. For the extraction with pressurized pre-treatment, the optimal temperature, pH value and extraction time were 120 ℃, 5.7 and 3.5 h, respectively. On the basis of this work, a pilot-scale production was finished by membrane separation technology and spray dryer. The production cost decreased greatly and quality of SDF was better. This made it suitable for industrialization. The best material for production of SDF was the soybean meal which protein was extracted ahead; the extraction rate of SDF was more than 43.0% of the material.