黄原胶生产菌株Xanthomonas campestris-9902代谢调控的研究

Studies on the Metabolism and Regulation of xanthan gum by Xanthomonas campostris-9902

本研究就Xanthomonas campestris-9902菌株的产胶潜能，以及过程代谢调控对黄原胶（Xanthangum）发酵的影响进行了研究。结果表明：在适当改进培养基组成和进一步完善工艺控制的前提下，X.Campestris-9902菌株是一支较好的黄原胶工业生产菌种。研究还发现，碳氮比、微量元素、前体物质和表面活性剂等，对黄原胶的后期生物合成，特别是胶粘性大分子的形成，有极其重要的影响。发酵培养基的改变和补料工艺的优化，可明显提高产胶率。

In this paper,the potential productivity and effect on metabolism and regulation during fermentation of xanthan gum by Xanthomonas campestris-9902 were studied.The results showed that X.Campestris-9902 was a proficient strain when the medium composition and process were properly improved.Furthermore,the carbon-to-nitrogen ratio,trace elements,precursor and surfactant etc.Played an important role in the later stage of biosynthesis,especially in the formation of viscous polymer.The production could be enhanced evidently if the medium and fed-batch process were optimized.