A mutant strain An 1 15 was obtained with the screening of a colour plate method and liquid state fermentation after Aspergillus niger An 1 producing xylanase was treated with UV and DES. The xylanase of An 1 15 increased by 90%.

• 木聚糖酶产生菌黑曲霉An 1经紫外线和硫酸二乙酯 (DES)处理后 ,采用显色平皿法及液体培养筛选 ,得到一产木聚糖酶活力较高的菌株An 1 15 ,其产酶能力比An 1提高 90%25。