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What determines drug solubility in lipid vehicles: is it predictable?
Sagar S Rane1, Bradley D Anderson
1Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40506, USA.
Advanced Drug Delivery Reviews
|December 20, 2007
Summary
Predicting drug solubility in lipid formulations is crucial for pharmaceutical development. This review explores factors influencing lipid solubility and models for prediction, highlighting water
Area of Science:
- Pharmaceutical Sciences
- Physical Chemistry
- Materials Science
Background:
- Lipid-based drug delivery systems offer potential for formulating challenging drug molecules.
- Accurate prediction of drug solubility in lipids is essential for excipient selection and formulation design.
- Factors like microstructure, physicochemical properties, and interfacial effects complicate solubility prediction.
Purpose of the Study:
- To review fundamental factors governing solubility in lipid mixtures.
- To discuss various models for estimating drug solubility in lipid formulations.
- To highlight the role of water and specific interactions in altering lipid solubility.
Main Methods:
- Literature review of existing models and experimental data on lipid solubility.
- Analysis of factors influencing drug solubility, including microstructure and physicochemical properties.
- Examination of the impact of water and specific solute-solvent interactions.
Main Results:
- Models of varying sophistication can estimate drug solubility in lipid mixtures.
- Water significantly impacts lipid solubility by interacting with solutes and altering lipid organization.
- Specific interactions are critical for polar solutes, influencing overall solubility.
Conclusions:
- A rational understanding of solubilization in lipids is vital for drug formulation.
- Models predicting relative solubility from chemical structure show promise.
- Accurate absolute solubility prediction requires understanding the drug's crystalline state and specific interactions.
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