Abstract
Pineapple-fibre holocellulose was extracted with alkaline solutions of increasing concentration to give hemicellulose fractions I–III. Purified fraction I (major component) contained d-xylose, l-arabinose, and 4-O-methyl-d-glucuronic acid in the molar proportions 10:0.6:1, and an average of ∼116 sugar residues, whereas its methylated product contained ∼94 sugar residues. Structural studies of the hemicellulose and its arabinose-free portion showed it to be a (1→4)-linked β-d-xylan with approximately every tenth residue carrying a 4-O-methyl-α-d-glucopyranosyluronic acid group at O-2 and every sixteenth residue carrying an l-arabinofuranosyl group at O-3.
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