标准摘要
[中文适用范围]： ISO 8292 的本部分规定了一种使用低分辨率脉冲核磁共振 (NMR) 波谱法直接测定动物和植物脂肪和油 (以下称为“脂肪”) 中固体脂肪含量的方法。规定了两种替代热预处理方法：一种用于不表现出明显多态性且主要稳定在 β′-多态性的通用脂肪；一种用于表现出明显多态性并稳定在 β-多态性的类似可可脂的脂肪。在资料性附件中给出了可能更适合特定用途的其他热预处理方法。直接法易于操作且可重复性好，但由于计算方法近似，因此不如间接法准确。注：ISO 8292-2 中规定了一种间接法。 [外文原描述]： ISO 8292-1:2008 specifies a direct method for the determination of solid fat content in animal and vegetable fats and oils (hereafter designated "fats") using low-resolution pulsed nuclear magnetic resonance spectrometry. Two alternative thermal pre-treatments are specified: one for general purpose fats not exhibiting pronounced polymorphism and which stabilize mainly in the β'-polymorph; and one for fats similar to cocoa butter which exhibit pronounced polymorphism and stabilize in the β-polymorph. Additional thermal pre-treatments, which may be more suitable for specific purposes, are given in an informative annex. The direct method is easy to carry out and is reproducible, but is not as accurate as the indirect method due to the approximate method of calculation.
英文名称Animal and vegetable fats and oils — Determination of solid fat content by pulsed NMR — Part 1: Direct method