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13C 1D NMR of the K15 polysaccharide at 50 °C. (A) Native K15 at pD ~ 7. (B) K15 PS after raising the pD to ~ 12. A total of 16 signals can be identified belonging to the K15 PS in panel (B); the ‘*’ marks indicate narrow trace signals from K15 decomposition (acetate and glycerol).
