Objective To obtain mutant strains of high production of pullulan and low secretion of pigment and optimize fermentation process of pullulan.
目的获取普鲁兰糖产量高且色素分泌少的突变菌株，优化普鲁兰糖的发酵工艺。
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The optimal fermentation medium and conditions of mutant strain NAF-032 with a higher and stable yield of L-lactic acid were studied by orthogonal design theory.
The main research contents included the influence of SO_2 on the flavor stability of beer, the breeding of strain moderately producing SO_2, beer fermentation and genetic substance analysis of mutant.