【摘要】 利用自己设计的筛选方法,从不同的酿造曲样中筛选出1株产纤溶酶酶活较高的米曲霉菌株SA-6,其产纤溶酶酶活为25 U/mL。SA-6经过紫外线6、0Co和亚硝基胍诱变,筛选得到突变株NA-25,其产酶酶活为63 U/mL,是出发菌株SA-6的2.52倍。突变株NA-25的发酵性状改变,其产纤溶酶的高峰比出发菌株迟了约10 h。更多还原

【Abstract】 A Asperillus Oryzae strain,SA-6 was isolated with different screening methods and the fibrinolytic enzyme activity was 25 U/mL.A mutant was then isolated after SA-6 was treated with UV,⁶⁰Co and NTG and the relevant firbrinolytic enzyme activity was enhanced to 63 U/mL which was 1.52 times higher than that of SA-6.Comparing with the starting strain,the appearance time of the maximum fibrinolytic enzyme production of the mutant was delayed 10 hours.更多还原