一种降低细菌纤维素分子量的方法

摘要

Using coconut water as incubating system by adding galacturonic acid, bacterial cellulose (BC) were prepared by static fermentation culture method using Acetobacter xylinum which was screened in our own laboratory.The structure and performance of BC were studied.Results showed the yield of BC, water -holding performance and the thermal decomposition behavior declined, and the structure characteristics and the crystallization properties were very little difference with adding galacturonic acid, but the product molecular weight was lower, about 100000 or so, galacturonic acid instead of sucrose as carbon source can produce bacterial cellulose of low molecular weight.%以实验室自行筛选的木醋杆菌（Acetobacter xylinum）为菌种，海南椰子水为主要培养体系，在生物合成过程中向培养基中添加半乳糖醛酸，采用静态培养方法制备了细菌纤维素（BC），对 BC 的结构和性能进行了研究；结果表明：添加半乳糖醛酸后， BC 的产率、持水性能及热稳定性有所下降，而结构特征和结晶性能与不添加半乳糖醛酸的 BC 差别不大；但产物衍生化后的分子量却降低很大，约10万左右；有望用半乳糖醛酸代替蔗糖为碳源生产低分子量的细菌纤维素。