Influence of alkaline treatments and pretreatments in hemicellulose preparation

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Abstract
Boiling alc. or aq. solns. of NaOH breaks down hemicelluloses, whether present in wood in the natural condition or isolated. Pretreatment of lignified materials with boiling alc. NaOH had earlier been suggested as a means for reducing the lignin content of subsequent hemicellulose prepns.: while this aim is partly achieved, the simultaneous degradation suggests that the pretreatment should be omitted. Cold 4% NaOH does not necessarily remove all polyuronide hemicelluloses from woods, and boiling 4% NaOH extraction may be necessary in some cases. The furfuraldehyde yield from woods and from hemicelluloses is influenced by various non-furfuraldehyde-yielding concomitants.

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