Biosynthesis of hetero-polysaccharides by Acetobacter xylinum - Synthesis and characterization of metal-ion adsorptive properties of partially carboxymethylated cellulose
Division of Bio-science, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
Abstract:
Biological reconstruction of water-soluble carboxymethylated cellulose (CMC; D.S. =0.47) has been achieved by culturing Acetobacter xylinum in medium containing CMC and
-glucose to give a novel hetero-polysaccharide having a carboxymethyl function. The novel extracellular polysaccharide, carboxymethylated-bacterial cellulose (CM-BC), had an ion exchange ability with enhanced specific adsorption for lead and uranyl ions compared to the original CMC and bacterial cellulose. The contribution of the hydroxy group at C-2 was confirmed by applying carboxymethylated chitin, which possesses acetamido group at C-2 of the glucose residue, as the carbon source of the incubation.