The influence of Direct Red 75 and 79 having the same ureylenebis(naphthylazo)benzene skeletal structure on the nascent structure of microbial cellulose was examined. Each product obtained from Acetobacter-culture in the presence of Direct Red 75 or Direct Red 79 is a crystalline complex in which the monolayer of a dye is included between the cellulose sheets corresponding to the (11̄0) plane of microbial cellulose. Cellulose regenerated from each product forms cellulose II. Although the substituent groups in the skeletal structure of both the dyes are not the same, there is no different interactions on the nascent structure of microbial cellulose. Due to the ureylene group on the skeletal structure of dye, stronger hydrogen bonding is occurred between the dye and cellulose in the product. The ureylene group affects stable hydrogen bonding in the cellulose regenerated from Direct Red 75 and Direct Red 79 products.
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Kai, A., Mondal, M. Structure of Nascent Microbial Cellulose III. Different Influence of Direct Red 75 and 79 on Nascent Microbial Cellulose. Polym J 30, 398–403 (1998). https://doi.org/10.1295/polymj.30.398
- Acetobacter xylinum
- Dye-Cellulose Complex
- Cellulose Sheet
- Regenerated Cellulose II
- Direct Red 75
- Direct Red 79
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