【摘要】 在传统植酸钙制备工艺的基础上对米糠植酸钙的精制工艺进行了优化,并对其米糠残渣的营养成份进行了分析。结果表明粗品植酸钙最佳酸浸条件为温度为60℃,pH为1.5,酸浸时间为8 h,酸浸料液比为1∶10,在此条件下,采用二次碱沉法,200 g米糠,可获得粗品植酸钙18.8 g,粗品植酸钙的得率为9.4%,其植酸质量分数为80.9%。利用活性炭对粗品植酸钙酸溶液进行脱色,其最适的脱色条件为温度40℃,时间60 min,活性炭的量为8%(W/V),两次脱色效果明显优于一次脱色。在此条件下,10 g粗品植酸钙制得精制植酸钙7.63 g,得率为76.3%,植酸回收率为77.4%。可见光区光谱扫描显示精制植酸钙酸溶液在380～800nm的吸光度比粗品植酸钙均下降了60%以上,所得精制植酸钙的酸溶液近乎无色,脱色效果较好。与未提取植酸的米糠相比,提取植酸后的米糠残渣中粗蛋白、脂肪、粗纤维、无氮浸出物等营养成份变化不大,而其总磷的43.6%以植酸的形式转入酸浸提液中,使得米糠残渣的营养成分更利于动物的吸收。更多还原

【Abstract】 The preparation of refined calcium phytate from rice bran and the composition of residue were studied.The proper condition of HCl immersing of the crude calcium phytate from rice bran was 60 ℃,pH 1.5,8 h,and solid/liquid ratio 1∶10.On this condition,18.8 g crude calcium phytate was obtained from 200 g rice bran,the yield rate was 9.4% and the phytic acid content of product was 80.9%.The crude calcium phytate was decolorized with activated charcoal.The decoloration condition was activated charcoal amount 8%(W/V)),60℃,60min and twice.Results:Under this condition,7.63 g refined calcium phytate with phytic acid content of 82.1% is gained from 10 g crude calcium phytate,the yield rate is 76.3%.The absorption of the refined calcium phytate in visible spectrum region of 380～800 nm declines by 60% compared with the crude calcium phytate,and the acid solution of the refined calcium phytate is almost colorless,so the effect of the decoloration craft is good.Compared with rice bran,the main nutrient contents change little and the total phosphor decreases by 43.6% that made the residue more digestible for animals.更多还原