改性细菌纤维素的发酵生产及性能测定

Production and performance determination of modified bacterial cellulose

发酵生产细菌纤维素时在培养基中添加海藻酸钠、羧甲基纤维素、聚乙烯醇、聚谷氨酸等水溶性高分子物质以制备改性细菌纤维素,并用扫描电镜和红外光谱对其进行表征,同时测定产量、含水量、复水率等指标和厚度、硬度、剪切力等物理性质。结果显示改性细菌纤维素在各方面都优于原液发酵产物,而且在电镜观察时发现其结构改变很明显,纤维束变粗,红外光谱测试结果所加物质的特征峰都有明显的加强。

Modified bacterial cellulose has been produced in the presence of water-soluble polymer material, such as sodium alginate, methyl cellulose, carboxymethylcellulose, polyvinyl alcohol and polyglutamic acid, respectively, in the culture medium, it was characterized by scanning electron microscopy and infrared spectra, then we determined its production, water content, rehabilitation of water, and other indicators as well as physical properties, such as thickness, hardness, shear stress. We conclude that modified bacterial cellulose was better than bacterial cellulose in many aspects, the investigations electron microscopy indicated their structures changed obviously and the diameter of fiber bundles became bigger, the result of IR test showed that the characteristic peaks of additional material had increased obviously.