Abstract
Abstract The molecular shape of a polysaccharide, which determines its cohesive and water retention properties, depends on the types of bonding present between sugar residues. These may be determined by permethylation and hydrolysis. Neither acetylation, nor reduction of soil prior to methylation, increased the overall yield of methylated product, although acetylation resulted in a greater proportion being released in the first methylation which may avoid some s‐elimination reactions on remethylation. Reduction by NaBH4 before each methylation step did not result in any large differences in the proportions of different sugar residues, suggesting that s‐elimination reactions did not have a prominent effect in the remethylation of the soil residue. Grinding and freeze‐milling of the soil prior to methylation gave a greater release of methylated product in the first three methylations and the yield was about 15% greater overall.
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