Parent strain Lactobacillus delbruckii 1-1 which accumulated 5.8% of calcium lactate was mutated by UV-ray, DES and NaNO2, and high lactic acid-producing mutant ZL-513 which accumulated 9.4% of calcium lactate was isolated.

• 以分离到的一株德氏乳杆菌（Lactobacillus delbruckii） 1－1为出发菌株，经紫外线、硫酸二乙酯、亚硝酸钠等诱变剂处理，筛选出一株产乳酸较高的突变株ZL－513，乳酸钙产量由5.；8%25提高至9