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- W2000267898 abstract "Nuclear (1H) magnetic stray field gradient methods have been used to measure the concentration dependence of the water self-diffusion coefficient (Dself) in the commercially available bacterial exopolysaccharide xanthan and a chemically derived deacetylated form. The Dself coefficient of water is interpreted to directly relate to the degree of water binding in the polysaccharide gel. The removal of acetyl groups from xanthan has been shown to result in a reduction in Dself at any given polymer concentration. In addition, stray field magnetic resonance profiling (1H) has been used to measure the rate at which water diffuses through a polysaccharide gel at a range of polymer concentrations (Dmutual coefficient of water) in: xanthan; deacetylated xanthan and polymers produced by the soil bacteria, Enterobacter cloacae and Azotobacter chroococcum. Samples with a reduced acetyl or uronic acid content showed a lower Dmutualcoefficient at a range of polymer concentrations. The lower Dself coefficient found for deacetylated xanthan is believed to contribute to the lower Dmutualcoefficient obtained relative to the native molecule. The observed link between the mobility (Dself) and transport (Dmutual) of water in bacterial exopolysaccharides furthers our understanding of the role(s) of these materials for bacteria and opens new opportunities for engineering bacteria for improved survival in water-stressed environments." @default.
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- W2000267898 date "1999-04-01" @default.
- W2000267898 modified "2023-09-26" @default.
- W2000267898 title "A stray field magnetic resonance study of water diffusion in bacterial exopolysaccharides" @default.
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- W2000267898 doi "https://doi.org/10.1016/s0141-0229(98)00129-x" @default.
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