动物和植物的脂肪和油.用高效粒度排除色谱法(HPSEC)测定聚合三脂酰甘油

[中文适用范围]： 本国际标准规定了一种使用高效尺寸排阻色谱法（HPSEC）测定油脂中聚合物三酰甘油（PTAGs）含量（以质量分数表示）的方法。该方法适用于含有至少 3%（按峰面积计算）这些聚合物的油脂。PTAGs（严格来说是二聚体和低聚体三酰甘油）是在油脂加热过程中形成的，因此该方法用于评估煎炸油使用后的热劣化程度。该方法适用于煎炸油以及经过热处理的油脂和油，前提是 PTAGs 含量至少为 3%。该方法也可用于测定动物饲料中脂肪的聚合物，尽管在这种情况下，所使用的提取方法可能会影响结果。 [外文原描述]： ISO 16931:2009 specifies a method using high-performance size-exclusion chromatography (HPSEC) to determine the contents, as mass fractions, of polymerized triacylglycerols (PTAGs) in oils and fats which contain at least 3 % (from peak areas) of these polymers. PTAGs (strictly speaking dimeric and oligomeric triacylglycerols) are formed during the heating of fats and oils, and thus, the method serves to assess the thermal deterioration of frying fats after use. This method is applicable to frying fats and fats and oils that have been thermally treated, provided that the content of PTAGs is at least 3 %. It can also be applied to the determination of polymers in fats for animal feedstuffs, although in this case, the extraction method used can have an influence on the result.