婴儿配方奶粉和成人营养品.用紫外线检测的（超）高效液相色谱法（（U）HPLC-UV）测定维生素C

[中文适用范围]： 本文件规定了使用（超）高效液相色谱法和紫外法测定所有形式的婴儿和成人配方奶粉（粉末、即食液体和液体浓缩物）中维生素 C（L-抗坏血酸）的方法。 检测(U)HPLC-UV。 应用范围为 2.5 mg/100 g（定量限）至 50 mg/100 g，以消耗的产品表示。 该方法能够区分 D-抗坏血酸（异抗坏血酸或异抗坏血酸）和 L-抗坏血酸。 [外文原描述]： This document specifies a method for the determination of vitamin C (L-ascorbic acid) present in all forms of infant and adult formulas (powders, ready-to-feed liquids and liquid concentrates), using (ultra) high performance liquid chromatography with ultraviolet detection (U)HPLC-UV. The application range runs from 2,5 mg/100 g (limit of quantification) to 50 mg/100 g expressed in the product as consumed. The method is able to distinguish between D-ascorbic acid (isoascorbic- or erythorbic acid) and L-ascorbic acid.