Journal
CHEMISTRY & BIODIVERSITY
Volume 6, Issue 11, Pages 1767-1788Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbdv.200900164
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Methods are described for detecting precipitation of ionisable drugs under conditions of changing pH, estimating kinetic solubility from the onset of precipitation, and measuring solubility by chasing equilibrium. Definitions are presented for kinetic, equilibrium, and intrinsic solubility of ionisable drugs, supersaturation and subsaturation, and for chasers and non-chasers, which are two classes of ionisable drug with significantly different solubility properties. The use of Bjerrum Curves and Neutral-Species Concentration Profiles to depict solubility properties are described and illustrated with case studies showing super-dissolving behaviour, conversion between crystalline forms and enhancement of solubility through supersaturation, and the use of additives and simulated gastrointestinal fluids.
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