Homogeneous and porous modified bacterial cellulose achieved by in situ modification with low amounts of carboxymethyl cellulose
Homogeneous and porous modified bacterial cellulose achieved by in situ modification with low amounts of carboxymethyl cellulose
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DOI：
10.1007/s10570-014-0316-1
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发表时间：
2014-08-01
期刊：
影响因子：
5.7
通讯作者：
Li, Guo Qiang
中科院分区：
文献类型：
--
作者：
Ma, Ting;Zhao, Qian Qian;Li, Guo Qiang
为了提高细菌纤维素(BC)的复水能力，在以往的报道中，许多大分子都被用作修饰剂。然而，添加剂在BC基质中的聚集似乎是不可避免的。在木质葡萄糖酸杆菌ATCC53582和肠杆菌培养条件下，用羧甲基纤维素(CMC)对BC膜的不同部分进行了原位修饰。FY-07。在木棉ATCC53582的BC膜中观察到了CMC的浓度梯度，但与肠杆菌没有观察到CMC的浓度梯度。FY-07。低浓度的CMC(0.01%，m/v)足以在肠杆菌培养中原位修饰BC。FY-07，CMC能与新形成的BC充分接触。改性后的BC结晶度降低39.8%以上，复水能力和持水能力分别提高43.3%和31.0%。与肠杆菌产生的专性好氧菌如木霉ATCC53582不同的是，改性细菌的细胞膜。FY-07具有较好的均匀性和孔隙率。
To improve the rehydration ability of bacterial cellulose (BC), many macromolecules have been used as modifiers in previous reports. However, the aggregation of additives in the BC matrix appears to be inevitable. We investigated different parts of a BC pellicle, which was achieved by in situ modification with carboxymethyl cellulose (CMC) in culture with Gluconacetobacter xylinus ATCC53582 or Enterobacter sp. FY-07. We observed a concentration gradient of CMC in the BC pellicle from G. xylinus ATCC53582, but not with Enterobacter sp. FY-07. Low concentrations of CMC (0.01 %, m/v) are sufficient to modify BC in situ in culture with Enterobacter sp. FY-07, in which CMC could sufficiently contact with the newly formed BC. The crystallinity of the modified BC decreased by more than 39.8 %, and its rehydration ability and water holding capacity increased by 43.3 and 31.0 %, respectively. Unlike the pellicle of modified BC achieved from obligate aerobes, such as G. xylinus ATCC53582, that produced by Enterobacter sp. FY-07 exhibited better homogeneity and porosity.