...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Research journal of microbiology. >Improving Xanthan Fermentation in a Mechanically Stirred Aerated Fermenter via External Loop*
【24h】

Improving Xanthan Fermentation in a Mechanically Stirred Aerated Fermenter via External Loop*

机译：通过外部回路改善机械搅拌的充气发酵罐中的黄原胶发酵*

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Xanthan fermentation processes were investigated in a 5 L Mechanically Stirred Aerated Fermenter (MSAF) with and without external loop. Experimental data showed that the process with external loop had higher final xanthan gum concentration, shorter fermentation time and lower energy consumption.Xanthan gum is a high molecular weight natural expolysaccharide produced by Xanthomonas campestris'using carbohydrates. Because of its excellent rheological, physical and chemical properties, this biopolymer has been widely used as a thickening or stabilizing agent in oil, food, textile, cosmetic and pharmaceutical industries and its output is now the largest of natural expolysaccharides (Garcia-Ochoa et al., 2000). Unfortunately, xanthan fermentation is probably the most complex fermentation process in terms of rheological property and associated mixing, power consumption, mass and heat transfer problems (Zhao et al, 1994). This makes xanthan fermentation become the bottleneck in xanthan gum production. In order to improve productivity and shorten fermentation time, extensive research work has been carried out in optimizing xanthan fermentation conditions and developing new bioreactors (Lo et al., 2001; Francisco et al., 2001). Although a lot of bioreactors, such as airlift fermenter, centrifugal packed bed fermenter and static mixing fermenter, have been used for xanthan fermentation in laboratory or pilot scale, the Mechanically Stirred Aerated Fermenter (MSAF) is still mostly used in industrial scale (Garcia-Ochoa et al., 2000). However, the conventional MSAF
机译：黄原胶发酵过程在有外部循环和没有外部循环的5 L机械搅拌充气发酵罐（MSAF）中进行了研究。实验数据表明，采用外环法生产的最终黄原胶浓度较高，发酵时间较短，能耗较低。黄原胶是由樟脑单胞菌利用碳水化合物生产的高分子量天然多糖。由于其优异的流变性，物理和化学性质，这种生物聚合物已被广泛用作石油，食品，纺织，化妆品和制药行业的增稠剂或稳定剂，目前其产量是最大的天然多糖（Garcia-Ochoa等人。，2000）。不幸的是，就流变特性以及相关的混合，功耗，质量和传热问题而言，黄原胶发酵可能是最复杂的发酵过程（Zhao等，1994）。这使得黄原胶发酵成为黄原胶生产的瓶颈。为了提高生产率并缩短发酵时间，已在优化黄原胶发酵条件和开发新的生物反应器方面进行了广泛的研究工作（Lo等，2001; Francisco等，2001）。尽管许多生物反应器（如气浮式发酵罐，离心填充床发酵罐和静态混合发酵罐）已在实验室或中试规模的黄原胶发酵中使用，但机械搅拌充气发酵罐（MSAF）仍主要用于工业规模（Garcia- Ochoa等，2000）。但是，常规MSAF

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号