Abstract
The length of the side chains in dextran NRRL B-512 has been studied by sequential degradation. Selective removal of the terminal d-glucosyl groups was achieved by alkaline treatment of a methylated dextran in which the hydroxymethyl groups had been replaced by C-p-tolylsulfonylmethyl groups; the 6-hydroxyl group of the new terminal units thus formed is unsubstituted. The degraded material was subjected to a second degradation by using the same procedure. The reactions were followed by methylation and/or ethylation of the products, acid hydrolysis, and analysis of the resulting mixture of ethers by g.l.c.-m.s. As a result of these studies, it is concluded that about 40% of the side chains contain only one d-glucose residue, at least 45% are two d-glucose units long, and the rest (max. 15%) are longer than two such units.
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