原位生物合成中甘油醛改性细菌纤维素的研究  

The In-situ Biosynthesis of Bacterial Cellulose Modified from Glyceraldehyde

作　　者：李玉洁[1] 冯玉红[1] 张名楠[1] 权亚彤 

机构地区：[1]海南大学材料与化工学院,海口570228

出　　处：《材料导报》2016年第8期46-50,共5页Materials Reports

基　　金：海南省自然科学基金(213011);海南省教育厅基金项目(Hjkj2013-06)

摘　　要：以木醋杆菌为菌种,在椰子水培养体系中添加甘油醛原位生物合成改性细菌纤维素(Bacterial cellulose,BC)。发现未改性BC和改性BC均具有良好的三维网状结构和优良的吸水、持水性能。采用FTIR、XRD、TGA和电子万能试验机对产物进行了分析表征,并测试了产物的特性粘度。结果表明,与未改性BC相比,改性BC的化学结构无改变;随着体系中甘油醛添加量的增大,所合成的改性BC的结晶指数略降低,但是其纤维素Iα晶体的含量明显增加;而且改性BC显示出较好的热稳定性,当甘油醛添加量为10g/L时,改性BC的最大失重温度比未改性BC提高了约20℃。此外,培养基中甘油醛的添加可以制备出聚合度低、溶解性能更好、韧性更强的BC,这有利于BC在工业上更广泛的应用。The modified bacterial cellulose （13（2） was biosynthesized during the cultivation of Acetobactexrylihum in coconut-water medium containing glyceraldehyde. It revealed that BC and modified BC all had good three dimensional network structure and excellent water absorption and water holding capacity. The structures and properties of membranes were determined by means of FTIR, XRD, TGA and electronic universal testing machine. The intrinsic viscosity of products were also studied. The results showed that the chemical structure of modified BC had no difference with that of the unmodified BC. The crystallinity index of modified BC decreased slightly while the content of cellulose Ia increased significantly with the increasing of concentration of glyceraldehyde. Furthermore, the modified BC exhibited good thermal stability, and the temperature of maximum weight loss rate of modified BC was 20 ℃higher than that of the pure BC when 10 g/L glyceraldehyde was added in the medium. Besides, BC with lower degree of polymerization, better solubility and increased toughness could be produced in the presence of glyceraldehyde, which might contribute to broad industrial application of BC.

关 键 词：细菌纤维素 甘油醛 椰子水 生物合成 结晶指数 热稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ352[化学工程]