USP34中关于胰岛素的锌含量测定原文：Zinc content 591 — Determine the zinc content of about 10 mg of it, accurately weighed: not more than 1.0% is found, calculated on the dried basis. 大概意思是：精密称取10mg样品，按干燥品计算其含量不超过1.0%。而在591中，原文“591 ZINC DETERMINATION The need for a quantitative determination of zinc in the Pharmacopeial insulin preparations reflects the fact that the element is an essential component of zinc-insulin crystals. In common with lead, zinc may be determined either by the dithizone method or by atomic absorption. ” 红色字体，大概意思是“通常铅，锌的含量的测定，可以用双硫腙法或原子吸收法测定。
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