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NMR spectroscopic structural characterization of a water-soluble β-(1→3, 1→6)-glucan from Aureobasidium pullulans.
Carbohydrate Polymers 2017 October 16
An unambiguous structural characterization of the water-soluble Aureobasidium pullulans β-(1→3, 1→6)-glucan is yet to be achieved, although this β-(1→3, 1→6)-glucan is expected to exhibit excellent biofunctional properties. Thus, we herein report the elucidation of the primary structure of the A. pullulans β-(1→3, 1→6)-glucan using nuclear magnetic resonance spectroscopy, followed by comparison of the obtained structure with that of schizophyllan (SPG). Structural characterization of the A. pullulans β-(1→3, 1→6)-glucan revealed that the structural units are a β-(1→3)-d-glucan backbone with four β-(1→6)-d-glucosyl side branching units every six residues. In addition, circular dichroism spectroscopic analysis revealed that the β-(1→3, 1→6)-glucan interacted with polyadenylic acid (poly(A)) chains in DMSO solution to form a complex similar to that obtained in the complexation of SPG/poly(A). This finding indicates that β-(1→3, 1→6)-glucan forms a triple-helical conformation in aqueous solution but exhibits a random coil structure in DMSO solution, which is similar to the behavior of SPG.
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