英语语法分析

It was shown as a single band in SDS-PAGE. The molecular weight of lactoperoxidase was 75035d.

经SDS - PAGE测定，分离出的乳过氧化物酶显示为单一区带，相对分子质量为75035d。

Objective:To study the effects of lactoperoxidase system on the growth of streptococcus in contineous culture.

目的：探讨乳过氧化物酶系统在口腔微生态环境中对链球菌族生长和菌种平衡的影响。

But its "approval" letter assumes that the proteins are mainly lactoferrin and lactoperoxidase, which are pretty well known to be safe.

但认证信显示添加的蛋白主要是乳铁传递蛋白和乳过氧化物酶，这两者的安全性早已得到认可。