THE ISOLATION OF A REPRESENTATIVE LIGNIN FRACTION FROM WOOD AND STRAW MEALS

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Abstract
The acidolysis procedure was used for the isolation of a representative lignin fraction from 3 divisions of lignified materials, deciduous and coniferous woods and cereal straws. By this method lignin was most easily isolated from the cereal straws (40- 50% yield) and least easily from the conifers (10-20% yield), with the deciduous woods occupying an intermediate position (20-35% yield). The deciduous woods and cereal straws gave rise to similar yields (18-23%) of Klason lignin as opposed to the much higher yields (25-31%) obtained from the conifers, and the former group had a C and H content of about 59 and 5.5% respectively as opposed to about 63 and 6.3% respectively for the latter group. There was, too, a slight but significant difference in the methoxyl content of the deciduous and straw lignins, the latter being about 1% greater than the former.