The IR spectra of sodium salt hyaluronic acid, chondroitin-4-sulfate, chondroitin-6-sulfate, dermatan-sulfate, protein-chondroitin-keratan-sulfate and aggregates of proteoglycans of the hyaline cartilage, heparin fractions containing 3 and 4 residues of sulfuric acid per dimer of polymer were obtained. It was shown that comparative analysis of IR spectra of the proteoglycans makes it possible to identify the 1150 cm-1, 1125 cm-1.
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