de Vries E J, Mulder F J, Borsje B
J Assoc Off Anal Chem. 1978 May;61(3):731-4.
The official first action method for determining vitamin D in multivitamin preparations was modified. The method was collaboratively studied by 7 laboratories, using 6 preparations in oil. The preparations consisted of vitamin D at various levels and at various ratios (in w/w) in vitamin A. Three samples contained cholecalciferol and 3 samples contained vitamin D3 from vitamin D3 resin. After outliers were eliminated by the Dixon test, data were analyzed and averages were compared with amounts of vitamin D known to be in each sample. For samples with vitamin D: vitamin A ratios of 1:0.5, 1:5, and 1:10, the mean vitamin D recoveries were 98.8, 94.6, and 90.7%, respectively. The method has been adopted as official final action.
多种维生素制剂中维生素D的官方首次行动方法被修改。该方法由7个实验室共同研究，使用了6种油剂制剂。这些制剂含有不同水平和不同比例（重量比）的维生素D与维生素A。3个样品含有胆钙化醇，3个样品含有来自维生素D3树脂的维生素D3。通过狄克逊检验剔除异常值后，对数据进行分析，并将平均值与每个样品中已知的维生素D含量进行比较。对于维生素D与维生素A比例为1:0.5、1:5和1:10的样品，维生素D的平均回收率分别为98.8%、94.6%和90.7%。该方法已被采纳为官方最终行动方法。
