摘要：The International Reference Preparation for Vitamin B12 was prepared in tablet form from a mixture of anhydrous cyanocobalamin and sodium chloride. In an international collaborative study, in which eleven laboratories participated, this preparation was examined qualitatively and quantitatively by spectrophotometric and microbiological methods. It was concluded that the International Reference Preparation is substantially pure and has a potency of 9.3 μg of cyanocobalamin per 20 mg of tablet. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (793K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 555 556 557 558 559 560 561 562
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