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10 g/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.
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