Abstract

Solubilities and intrinsic dissolution rates for alaproclate hydrochloride, oxazepam and dextropropoxyphene napsylate have been determined in binary mixtures of water and ethanol. On a log-log scale, a linear relationship between the solubilities and the corresponding intrinsic dissolution rates with a slope of 1.0 was found. A solubility range of four log-units was covered. However, dextropropoxyphene napsylate in pure ethanol appeared to diverge from this relationship. This was explained by a change in crystalline form as indicated by differential scanning calorimetry. By calculating the solubility in ethanol before the crystal form changed, a better fit for the solubility-intrinsic dissolution rate relationship was obtained.

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