Coacervates prepared from gelatin obtained from denatured tropocollagen and chondroitin sulfate were investigated by Nagura etal. (1988). The coacervates were formed at pH 4.5 with a weight ratio of chondroitin sulfate equal to 0.1. The helixes of the collagen molecules consisted of a small number of triple-helix crystallites. Intermolecular hydrogen bonds occurred between the amide groups of collagen and the hydroxyl groups of the chondroitin molecules in the outer surface of the coacervate.

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