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- W2034218497 abstract "Pure (1→3)-β-polyglucuronic acid sodium salt was prepared from curdlan by oxidation with 4-acetamido-TEMPO/NaClO/NaClO2 in water at pH 4.7 and 35 °C. The oxidation conditions, including the reaction time and amounts of reagents added, were optimized for the preparation of (1→3)-β-polyglucuronic acids with high molecular weights. The primary C6 hydroxyl groups of curdlan were completely oxidized to the corresponding C6-carboxylates using a one- or two-step reaction process by controlling the oxidation conditions, thus providing pure (1→3)-β-polyglucuronic acids consisting only of d-glucuronosyl units. Unfortunately, however, the increased amounts of reagents and long reaction time led to significant depolymerization of the curdlan during the oxidation process, and the resulting (1→3)-β-polyglucuronic acids had weight-average degrees of polymerization of 340–360. The 13C and 1H NMR chemical shifts of the products were successfully assigned using pure (1→3)-β-polyglucuronic acid." @default.
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- W2034218497 date "2014-01-01" @default.
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- W2034218497 title "Preparation of completely C6-carboxylated curdlan by catalytic oxidation with 4-acetamido-TEMPO" @default.
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- W2034218497 doi "https://doi.org/10.1016/j.carbpol.2012.11.094" @default.
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