Details

Autor(en) / Beteiligte

• Schmidt, Ingeborg
• Fischer, Klaus
• Weightman, Derek

Titel

Comparing Dichromate Oxidation and Size Exclusion Chromatography of Dissolved Carbohydrates

Ist Teil von

• Macromolecular symposia, 2005-12, Vol.232 (1), p.137-141

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2005

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 S18 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, S10 values are overestimated when determined by dichromate oxidation in higher alpha pulps.