Methods Using NCTC 929 clone and agar diffusion method, the three products of different producing dates were evaluated by both methods of laying specimens directly and only laying its extraction.

• 方法采用细胞毒性试验中的琼脂覆盖法,通过直接放置样品和放置样品浸提液载片两种方法,对三批不同生产日期的奥美定进行测试研究。