Preparation Of Bacterial Cellulose And Modified

The influence of cultivated conditions and medium components oncellulose yield was studied in this paper, and the optimized fermentationcondition and medium component were obtained.Modified bacterial cellulose was then produced by two methods. One is toproduce bacterial cellulose by adding water soluble polysaccharide to thefermentation medium, the other is to modify common bacterial celluloseproduced in optimized fermentation condition by dipping them into polyhydriccompounds.Performances of common and modified bacterial cellulose were tested.Infra-red spectrums show that the products are cellulose, and modified groupsare also shown obviously in them. The ultrafine reticular structure and changesof meshes after modification can be seen by SEM. The water content of bacterialcellulose is 88% which is tested by weighing method, and above 90% aftermodification, the highest can be up to 99%; the swelling capacities of cellulosefilms are also improved with different degrees after drying in nature. Theadsorptive capacities to metal ion tests show that bacterial cellulose has highadsorbance to Cu²⁺, especially its modification products. In addition, thepolymerization degree and thermal stability of bacterial cellulose were tested byviscosimetry and DSC respectively.The experimental results show that bacterial cellulose is an excellent newkind of nanometer biomaterial, and the performances of its modificationproducts are better, we expect that these results can lay a foundation for makingother high performance composite material and broadening the application ofbacterial cellulose.