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Comparing Dichromate Oxidation and Size Exclusion Chromatography of Dissolved Carbohydrates
Author(s) -
Schmidt Ingeborg,
Fischer Klaus,
Weightman Derek
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200551416
Subject(s) - sodium hydroxide , solubility , chemistry , pulp (tooth) , size exclusion chromatography , cellulose , alkali metal , chromatography , hemicellulose , nuclear chemistry , organic chemistry , medicine , pathology , enzyme
Standardised methods are used to characterise the pulp or cellulosic material for its alkali resistance and alkali solubility. Today, pulp is usually characterised by its solubility in sodium hydroxide. The characterisation test was based on the treatment of pulp with sodium hydroxide solution of a defined concentration, according to a specified procedure. The dissolved organic matter was then determined by dichromate oxidation. The results obtained by size exclusion chromatography showed that both the amount and the molecular weight of the dissolved carbohydrates vary when investigating solubility and α ‐cellulose content of pulps. The results show further that S 18 values obtained by dichromate oxidation are overestimated when characterising pulps containing higher amounts of hemicellulose and/ or short chain cellulose, compared with results obtained by the SEC method. On the contrary, S 10 values are overestimated when determined by dichromate oxidation in higher alpha pulps.