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The extractability of collagen was examined in different sites of amnion and chorion from term deliveries. Sequential extraction with NaCl, acetic acid and CaCl2 showed that soluble collagen accounted for 1.5% of the proteins extracted. Saline extracted more collagen from the amnion than from the chorion. Acetic acid and CaCl2 extracted decreasing and increasing amounts of collagen from the amnion and chorion respectively. The concentration of collagen decreased linearly in the chorion as the rupture site was approached. The results indicate differences in the nature of collagen between amnion and chorion as well as in various sites in the latter.

Site variability in the solubility of collagen of human fetal membranes