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Abstract
To estimate the content of long-chain branching in dextrans, gel-permeation chromatography (g.p.c.) and viscometric measurements were carried out. The data obtained were analyzed by an iterative, computer method, proposed by Kurata et al., that can evaluate only the content of long-chain branching in a polymer. The dextrans used were those produced by Leuconostoc mesenteroides B-512 and other strains. The molecular weights of samples investigated ranged from 6.8 × 10 6 to 1.0 × 10 4, and the results indicated that the long-branch content increases with increasing molecular weight.
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