以脱脂米糠为原料,采用稀酸萃取加碱中和法(即沉淀法)制取植酸钙,考察了单因素条件下提取剂的种类、料液比、提取剂浓度、提取温度、碱中和过程pH值等对植酸钙收率的影响,并通过正交实验进行了优化。实验表明:以3%HCl为提取剂,植酸钙提取影响因素为提取温度>碱中和过程pH值>料液比>提取时间,提取植酸钙的最适条件为,提取温度为35℃,碱中和过程pH值为7.5,料液比为1∶9(g∶mL),提取时间为3 h。在此条件下,植酸钙收率可达1.5%左右。

The degreased rice bran was used as the raw materials,calcium phytate was produced by acid and alkaline neutralization(precipitation).The effects of acid kinds,the ratio of rice bran to extractant,extraction concentration,temperature,time,pH in neutralization reaction with base were investigated on the yield of calcium phytate by single factors experiments.The extraction was optimized by orthogonal experiments.The results showed that the influential factors order is: extraction temperature > pH in the process of alkaline neutralization > the ratio of rice bran to extractant > extraction time.By using 3% hydrochloric acid as the extracting agent,the best conditions of extraction phytin were as follows: the ratio of rice bran to extractant 1∶ 9,extraction temperature 35 ℃,extraction time 3 h,and pH in the process of alkaline neutralization 7.5.Under these conditions,the yield of calcium phytate was 1.5%.