Standard: TAPPI
Method: T 249
Title: Carbohydrate composition of extractive-free wood and wood pulp by gas-liquid chromatography
Overview
This method is used to determine the five principal monosaccharides which define the carbohydrate composition of wood and wood pulp. The constituents determined quantitatively and on an absolute basis are glucan, mannan, arabinan, xylan and galactan. Concentrations of the individual components as low as 0.1% can be determined. The method is applicable to extractive-free wood as well as to wood pulp.
The carbohydrate composition of a pulp is important in determining its response to processing conditions and the development of physical properties. In addition, the various carbohydrate constituents in wood have different sensitivities to pulping chemicals, and this affects pulp yield and quality. While relative ratios of the monosaccharide constituents may be satisfactory for characterization of dissolving pulps, it is desirable to obtain absolute values for paper grade pulps due to their more complex composition.
Samples
This test is performed in duplicate, 5 grams of dried material is recommended. A minimum of two samples submitted at the same time is required.
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