Abstract
The influence of the number of sulfonate groups in a Fluorescent Brightener on the crystal structure of microbial cellulose was examined by X-ray diffraction and solid state 13C NMR spectroscopy. All products obtained from Acetobacter xylinum-culture in the presence of a Fluorescent Brightener with 2 (FB), 4 (FWA2), or 6 sulfonate groups (FWA3) were crystalline complexes that contained a dye between cellulose sheets corresponding to the (11̄0) plane of microbial cellulose. Cellulose regenerated from the FB complex forms a cellulose Iβ rich structure, whereas cellulose regenerated from FWA2 and FWA3 complexes form cellulose II. The influence of a Fluorescent Brightener on the crystal formation of regenerated microbial cellulose clearly differs according to the number of sulfonate groups in a dye. The nascent structure of microbial cellulose may be the structure that the conformation and arrangement of the cellulose chain changes when a dye adheres to it.
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Kai, A., Keshk, S. Structure of Nascent Microbial Cellulose V. Influence of Number of Sulfonate Group in Fluorescent Brightener on Crystal Structure of Microbial Cellulose. Polym J 30, 996–1000 (1998). https://doi.org/10.1295/polymj.30.996
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DOI: https://doi.org/10.1295/polymj.30.996