Abstract
The double helix of a polysaccharide, xanthan was unwound by heating (denaturation) and rewound by cooling (renaturation) in acidic (0.01 M HCl) and basic (0.01 M NaOH) solutions. Circular dichroism spectra of xanthan renatured in the acidic and basic solutions were similar to those of native xanthan, which suggests that the local helical structures of the renatured xanthan were recovered by renaturation. The changes in the molar mass and intrinsic viscosity of xanthan induced by renaturation in the acidic solution can be explained by the renaturation scheme in the neutral solution, as reported previously. (Matsuda et al. Polym. J. 41, 526-532, 2009). Both the molar mass and radius of gyration of xanthan in the basic solution were decreased by denaturation and renaturation, and the molar mass dependence of the radius of gyration was similar to that of native xanthan. This change can be explained by the formation of a hairpin structure during renaturation in the basic solutions.
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Acknowledgements
This work was partially supported by MEXT Promotion of Distinctive Joint Research Center Program Grant Number# JPMXP 0621467946. The analysis of the samples was partly carried out with a JASCO J-720KS at the Instrumentation Center, The University of Kitakyushu. We thank Professor Takahiro Sato at the Open University of Japan who kindly provided the xanthan samples and the dialyzer and, allowed us to use the CD instrument. This work was supported by JSPS KAKENHI Grant Number 19H02773.
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Matsuda, Y., Saiki, R., Sato, K. et al. Thermal denaturation and renaturation of a double-helical polysaccharide xanthan in acidic and basic solutions. Polym J (2024). https://doi.org/10.1038/s41428-024-00892-y
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DOI: https://doi.org/10.1038/s41428-024-00892-y