黄单胞杆菌XC-82.R5二步发酵工艺研究

Two Stage Fermentation Process for Xanthan Gum by Strain XC82.R5

通过对黄单胞杆菌ＸＣ－８２．Ｒ５株的黄原胶二步发酵工艺研究，针对菌体在生长时期与产胶时期不同培养条件的需求，确定了两个阶段各自适宜的培养基组成、温度、ｐＨ值条件。实验表明，当流加稀释率为５时，二步发酵生产可达到较高水平，其产胶量较传统的间歇发酵提高了３１％。

he two stage fermentation process for Xanthan gum by strain XC82.R5 was studied. Suitable conditions on medium、temperature and pH for cellgrowth stage and gumproducing stage were determined respectively. The results showed when dilution rate was 5 and the gum productivity by two staged fermentation was 31% higher than that of conventional fermentation.