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A series of N-acetyl-chitooligosaccharides (GlcNAc) 1±6 have been studied by a nuclear magnetic resonance (NMR) method, diffusion ordered spectroscopy (DOSY). DOSY has also been applied to two additional synthetic related oligosaccharides [GlcNH 2 -(GlcNAc) 4 and GlcNH 2 -(GlcNAc) 2 -GlcNAcSO 3 Na]. A plot of the log of the determined diffusion coefficients (logD) of (GlcNAc) n versus the log of molecular weight was linear (6 points, R 2 0.995). The molecular weights of the two synthetic chitindoi:10.1093/glycob/cwh037 pmid:14693914 fatcat:lrjeo4pmwzapjbjfvbes3abjga