The solubilities of n-alkyl parabens have been determined in binary mixtures of ethanol and water. The profiles showed a dielectric requirement value of about 29-32 for the subject compounds. The butyl derivative formed a two-phase system over a certain composition range of ethanol and water. These
Bilinear model for the prediction of drug solubility in ethanol/water mixtures
β Scribed by Stephen G. Machatha; Samuel H. Yalkowsky
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 99 KB
- Volume
- 94
- Category
- Article
- ISSN
- 0022-3549
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β¦ Synopsis
A new bilinear function that accounts for the disparity between the log-linear and parabolic models for cosolvent solubilization is presented, where ethanol was used as the model cosolvent. This accounts for both the initial and terminal slopes in the ethanol/water solubility profiles of semi-polar solutes. The proposed model has only two fitted parameters sigmaA and sigmaB, which represent the initial and terminal asymptotes in the solubility profiles. The bilinear function can also model the ethanol/water solubility profile more accurately than the log-linear model and a general parabolic model.
π SIMILAR VOLUMES
The knowledge of the solubility of pharmaceuticals in pure solvents and solvent mixtures is crucial for designing the crystallization process of drug substances. The first step in finding optimal crystallization conditions is usually a solvent screening. Since experiments are very time consuming, a