WPS 244 Wood Analysis & Composition

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Last updated 7:06 PM on 7/26/26
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4 Terms

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Wood analysis

  • comprises the determination of the chemical properties of wood via;

    • Isolation

    • Purification

    • Characterisation of wood constituents

  • methods are more or less standardised

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Problems of wood analysis

  • Intimate ultrastructural & chemical association between wood components causing difficulties in quantitative seperation and determination of individual components due to:

    • Secondary reactions (degradation)

    • Change in bond types

    • Condensation

    • Polymerization & depolymerization

    • Oxidation/reduction

  • Lignin is major factor of these problems. Lignin remains associated with the isolated polysaccharides.

  • Cellulose and polyoses cannot be completely seperated without degradation of major components.

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Types of analysis

  • Detail and accuracy may differ depending on application.

  • Types:

    • Moisture content determination

    • Ash content determination

    • Extractives determination

    • Lignin determination

    • Holocellulose: total polysaccharide fraction of wood

  • Summative analysis: sum of approximately all the components analyzed out of 100%.

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Sampling and sample preparation