对产自乳酸菌Enterococcuze fecalis TN-9的蛋白酶，进行了硫酸铵沉淀，DEAE—Sephadex A-25以及DEAE Cellulofine A-500离子交换层析......

AbstractIn order to establish an HPLCMS/MS method for detecting progesterone in raw milk, raw milk was extracted with ......