Complete solubilization of bovine heart-valve gollagen was obtained by using sequential pepsin digestion and extraction with dithiothreitol under non-denaturing conditions. Use of the reducing agent was the crucial step resulting in solubilization. These findings suggest that disulphide-bonded proteins may be in part responsible for the insolubility of bovine heart-valve collagen.
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Jiménez et al. (1978) studied this question.
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