Journal
CELLULOSE
Volume 15, Issue 1, Pages 177-185Publisher
SPRINGER
DOI: 10.1007/s10570-007-9179-z
Keywords
cellulose; cellouronic acid; oxidation; TEMPO
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Microfibrillated cellulose from purified sugar beet pulp was converted into cellulose III by immersion in liquid ammonia. When freed from ammonia, this product was oxidized in water at pH-10 using NaBr, NaOCl and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) under various conditions and concentrations. The resulting water-soluble cellouronic acid-i.e. cellulose oxidized at the C6 position- was analyzed by high performance size exclusion chromatography (HPSEC) together with C-13 NMR spectroscopy. The oxidation parameters, namely reaction time, temperature, NaBr and TEMPO concentrations were varied to determine the optimum reaction conditions. A low TEMPO concentration, a rather fast reaction time and the conducting of the oxidation at 0 degrees C were critical to obtain pure cellouronic acid in high yield, high purity and high DP.
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