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对谷物脂肪酸值的测定(GB/T15684-1995)操作方法进行判定滴定终点条件对比试验。结果表明,在提取液中加100 mL无CO2蒸馏水,与加50 mL无CO2蒸馏水相比,酚酞指示剂PK(HIn)显色点更加容易捕捉,脂肪酸值检验结果更加接近实际含量,有利于终点的判定。
Determination of the value of the grain fatty acids (GB / T15684-1995) method of operation to determine the end point of the titration comparison test. The results showed that adding 100 mL of CO2-free distilled water to the extract showed that the color point of phenolphthalein indicator PK (HIn) was more easily captured than that of 50 mL of CO2-free distilled water, and the result of fatty acid value closer to the actual content was in favor of the endpoint The judge.