The swelling of collagen in alkaline solutions. 3. Swelling in solutions of bivalent bases

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Abstract
The swelling of collagen in solns. of bivalent bases was found to decrease in the order Ba(OH)2 > Sr(OH)2 > Ca(OH)2. Swelling in Ba(OH)2 solns. was rather less than half, and that in Ca(OH)2 solns. about 12.5% of that in NaOH solns. The small amt. of swelling in Ca(OH)2 solns. is attributed to combination of Ca ions with the collagen. The addition of CaCl2 or NaCl increased swelling in Ca(OH)2 solns. The increase with CaCl2 is attributed to decrease in the cohesion of the collagen, and the increase with NaCl to the addition of a univalent cation and consequent increase in swelling pressure.
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