More appropriate way to isolate rough ustiloxins was 100% methyl alcohol rather than 70% (NH4)2 SO1, solution because it involved the incompletely removed ions, NH4+and SO42-, which disturbed the mensuration of biological activity.

• 用100%25甲醇提取粗毒素比较好，而用70%25饱和(NH_4)_2SO_4溶液沉淀法，因为涉及到生物学活性测定，而其中的NH_4~+，SO_1~(2-)离子不能完全有效去除，影响生物学活性测定的准确性，所以不适合用于稻曲病毒素的分离。