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对利用高产果胶醇突变株G5512在500L发酵罐中调控深层发酵条件提高酶产率进行了试验研究。结果表明:通过分批补料对酶产率有提高,以高酯果胶为底物酶产率提高7.0%,以低酯果胶为底物酶产率提高23.5%;调节发酵液pH在3.5~4.0之间,以高酯果胶为底物酶产率提高9.7%,以低酯果胶为底物酶产率提高40.9%;添加0.1%吐温80对酶产率没有影响。“,”An experimental study was made to enhance the pectinase productivity by adjusting the conditions of deep fermentation for the high-yield mutant strain G5512 in a 500 liter tank. The results showed that to feed batch culture can enhance enzyme productivity by 7.0% with high methoxyl pectin as substrate, and by 23.5% with low methoxyl pectin as substrate. When the pH value of fermentation liquor is kept between 3.5 and 4. 0, enzyme productivity can be enhanced by 9.7% with high methoxyl pectin as substrate, and by 40.9% with low methoxyl pectin as substrate. Adding Tween 80 (0.1%) into the fermentation liquor has no effect on enzyme productivity.