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Freeze-drying yields stable and pure amorphous calcium carbonate (ACC).

Chemical communications (Cambridge, England) (2013-03-13)
Johannes Ihli, Alexander N Kulak, Fiona C Meldrum
PMID23478859
RESUMEN

A simple synthetic method is presented for the precipitation of high purity, dry amorphous calcium carbonate (ACC) based on freeze-drying saturated, counter ion free CaCO3 solutions, where the ACC produced shows an extended atmospheric stability. Translation of the methodology to amorphous calcium phosphate demonstrates the generality of the approach.

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