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Regioselective oxidation of C6 primary hydroxyls to carboxylate groups was applied to curdlan to prepare water-soluble oxidized products with less depolymerization by 4-acetamide-TEMPO/NaClO/NaClO 2 treatment in water at pH 4.7 and 35°C. Approximately 40–95% of the C6-OH groups of curdlan were converted to C6-carboxylate groups by the oxidation under the above conditions for 4–24h, and these...
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