【摘要】 通过改变摇瓶中液体容积和用机械搅拌、空气流量来调节供氧量，探讨了ＶＣ二步发酵中最适的供氧量，并用亚硫酸钠氧化法测定所用设备的供氧能力。考察表明，二步发酵为达最高产率的需氧要求不高仅为一步发酵的５０％，供氧过高或过低都使生产率下降。更多还原

【Abstract】 The optimal oxygen supply during fermentation for two-step technology of vitamin C was investigated.The oxygen-supplying ability of the apparatus was measured with sulfite test.The result showed that too strong agitation and aeration was not necessary during 2nd step fermentation,its oxygen demand was only 50% of that during 1st step fermentation.Both too high or too low supply of oxygen would reduce the rate of biotransformation.更多还原