1.Result Both mutanolysin and lysozyme could successfully lyse the wall of bifidobacterium and extract the plasmid from Bifidobacterium.

1.结孢链霉菌发酵液与溶菌酶均成功提取到质粒。

2.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.

2.法利用孢链霉菌发酵产生的变溶菌素来消杆菌细胞壁，提取质粒，并与商业溶菌酶法比较。