Abstract
A sample of xanthan, a bacterial β-1,4-D-glucan with ionic side chains, and its sonicated fragments in 0.1 M aqueous NaCl and cadoxen at 25°C were studied by light scattering. Radii of gyration ‹S2›1/2 as a function of weight-average molecular weight Mw in these two solvents, combined with the values of about 2 for the ratio Mw (in 0.1 M NaCl)/Mw (in cadoxen), showed that xanthan dissolves as rodlike dimers in 0.1 M aqueous NaCl and as single flexible chains in cadoxen. The contour length per main chain glucose residue of the xanthan dimer was found to be 0.47±0.01 nm, which agreed with the pitch (per glucose residue) of the 51 double-stranded helix proposed for the crystalline structure of xanthan. Thus, it was concluded that the xanthan dimer in 0.1 M aqueous NaCl has the 51 double-stranded helical structure.
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Sato, T., Norisuye, T. & Fujita, H. Double-Stranded Helix of Xanthan in Dilute Solution: Evidence from Light Scattering. Polym J 16, 341–350 (1984). https://doi.org/10.1295/polymj.16.341
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DOI: https://doi.org/10.1295/polymj.16.341
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