Abstract
Collagen reprecipitated from its solutions in dilute acid may show all the fine details of structure which the electron microscope has revealed in native collagen. A study has been made of the conditions of ionic strength, p H and concentration which lead to striated repricipitated collagen. Citrate buffers (0.02–0.1 M) have given best results. At values of p H between 4.6 and c. 5.0, nearly all the reprecipitated collagen has been well-formed and striated. Above and below this region the fibrils have been thinner and usually unstriated. Precipitation with NaCl has given non-striated fibrils whose dimensions and appearance have depended on the concentrations of the reactants.
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