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Phosphorylated derivatives of galactomannan from guar gum (GG) with the degree of substitution (DS) of 0.35–0.52 were synthesized using POCl3/pyridine. FT-IR, 13C NMR and XPS results revealed that phosphorylation had occurred and C-6 substitution was predominant in phosphorylated guar gum (PGG). PGG showed an increase in Mw and more broad molar mass distribution in size exclusion chromatography (SEC)...
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