Abstract
The time-dependent increase in stability, as measured in terms of the rate of dissolution, of collagen fibrils formed in vitro from pepsin-treated collagen was significantly affected only by temperature, and not by either ionic strength or pH. This is in contrast with collagen fibril formation, a process which is greatly affected by ionic strength and pH. Within the range of temperature 29-37 degrees C, lower temperature caused slower fibril formation and faster fibril stabilization. These results suggest that the intermolecular interactions involved in stabilizing collagen fibrils are entirely different from those involved in fibril formation. Based on kinetic analysis of the dissolution and stabilization of the fibrils, it is proposed that collagen molecules first form unstable fibrils which become gradually stabilized on prolonged incubation, without necessarily introducing covalent cross-links.
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