Head spore Sai Fu sodium molecular structure stabilizes , not being destroyed by beta-lactam enzyme , can not produce resistance to drugs or the resistance to drugs alternating therefore.

头孢噻呋钠分子结构稳定，不被β-内酰胺酶破坏，因此不会产生抗药性或交叉抗药性。

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The article briefs the source and harm of beta-lactam antibiotic in milk. The article also provides information for improvement on the methods of determination and quality of milk and milk products.

介绍了牛奶中青霉素类抗生素残留的来源、危害，并对在牛奶中常见的青霉素类抗生素的检测方法进行了阐述，对于改进实验方法和提高奶及奶制品质量都有一定的借鉴作用。

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