卡提素浮膜培养生产工艺的研究

为探索浮膜培养法生产卡提素新工艺,用液体苏通作培养基培养卡介苗菌,收集菌体,按卡提素提取工艺提取。同时,以传统的固体培养法(苏通马铃薯培养基)作参照,比较两种方法所得卡提素的提取率和卡提素的理化指标。结果显示:浮膜培养法所得卡提素的提取率为1.61%,比固体培养法的提取率3.08%低,理化指标符合精制卡介菌多糖核酸标准规定,其中核酸含量明显高于固体培养法的含量。而且,浮膜培养法手工操作量小,质量更容易控制,是一套适合卡提素工业化生产的新工艺。

一种户外开放式微藻培养体系优化

【目的】建立可用于大规模培养的户外开放式微藻培养体系。【方法】设计一种微藻平面开放浅层培养(Flat,open and shallow,FOS,简称浮法)体系,以小球藻(Chlorella sorokiniana)为模式藻种,探讨温度、光照、pH值和培养基营养成分等因素在该培养体系中对小球藻生长的影响,开展900 L体系的户外培养试验。【结果】浮法体系主要由塑料袋和垫板组成,在该培养体系中的小球藻在20~40℃范围内均可生长,最适生长温度为30~35℃。小球藻生长有明显的照度依赖性,无光时几不生长,随着照度升高,生长速度加快,在较高的照度下表现有光饱和现象。以TAP为基础培养基,在碳源或氮源缺乏时小球藻几不生长。pH 7.5左右有利于小球藻生长。900 L体系的户外培养试验的生物量(干物质得率)为0.15 g/(L·d)。【结论】在此新型户外平面开放浅层微藻培养体系中,温度、照度、pH值及营养成分等对小球藻的生长均有不同程度的影响。该体系有成本低、操作简便、容易控制、自然资源利用率高等特点,有大面积推广潜力。

Improved Production of Paclitaxel from Suspension Culture of Taxus chinensis var. mairei by in situ Extraction with Organic Solvents

The production of paclitaxel from suspension culture of Taxus chinensis var,mairei was improved by in situ extraction with organic solvents to avoid feedback repression and product degradation.Oleic acid and dibutyl phthalate were proved to be suitable solvents .The optimal volumetric percentage of organic solvents in the culture medium was found to be around 8%,and the favorable time for their introduction was at the exponential phase of cell growth,Paclitaxel production with the in situ extraction was ca 3-fold of that without extraction.