The interaction between synthetic crystalline calcium phosphate (apatite) and acidic macromolecules (sodium polyacrylate, sodium poly(L‐glutamate), chondroitin sulfate, phosvitin) was investigated by electron spin resonance spectroscopy of mineral‐macromolecule complexes doped with vanadyl ion (VO++) as a paramagnetic probe. Changes in magnetic parameters were interpreted in terms of bonding between mineral and macromolecule. The VO++ probe data indicated that polymer acidic functional groups were bound to mineral surfaces in all cases.
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Peckauskas et al. (1976) studied this question.
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