Method Bifidobacterium plasmid was extracted by mutanolysin from Streptomyces globisporus which could lyse the wall of bifidobacterium.The result was compared with that by lysozyme.

方法利用球孢链霉菌发酵产生菌素消化菌细胞壁，提取质粒，并与商业化菌酶法比较。