ISO 7847:1987 动植物脂肪和油.具有-顺式、顺式1和4-二烯结构的多不饱和脂肪酸的测定

标准编号：ISO 7847:1987

中文名称：动植物脂肪和油.具有-顺式、顺式1和4-二烯结构的多不饱和脂肪酸的测定

英文名称：Animal and vegetable fats and oils — Determination of polyunsaturated fatty acids with a cis,cis 1,4-diene structure

发布日期：1987-12

标准范围

规定了一种酶法，该方法不适用于含有ω-8和ω-9系列多不饱和脂肪酸或含有支链脂肪酸的脂肪和油。该方法包括在环境温度下对试验部分进行皂化，然后释放脂肪酸；脂肪酸的酶氧化；在这些氧化酸的最大吸光度波长（约235 nm）处测量，同时补偿样品中最初存在的任何二烯酸共轭酸的吸光度。

Specifies an enzymic method, which is not applicable to fats and oils containing polyunsaturated fatty acids of the omega-8 and omega-9 series or containing branched chain fatty acids. The method consists in saponifying of a test portion at ambient temperature followed by liberation of the fatty acids; enzymic oxidation of the fatty acids; measurement, at the wavelength of maximum absorbance (about 235 nm) of the absorbance due to these oxidized acids, while compensating for the absorbance due to any dienoic conjugated acids initially present in the sample.

标准预览图