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Study on the metastable zone width of ketoprofen
1Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore. g0201785@nus.edu.sg
Chirality
|March 8, 2006
Summary
Optimizing crystallization conditions enhances the metastable zone width (MSZW) for chiral drug separation. Increasing cooling rate and adjusting solvent ratios are key to improving MSZW for ketoprofen.
Area of Science:
- Chemical Engineering
- Crystallization Science
- Pharmaceutical Chemistry
Background:
- Chiral drug separation is crucial for developing pure enantiomer pharmaceuticals.
- Crystallization offers a cost-effective method for chiral drug separation.
- Metastable Zone Width (MSZW) is a critical parameter influencing crystallization efficiency.
Purpose of the Study:
- To investigate the impact of key factors on the MSZW of ketoprofen enantiomers.
- To optimize conditions for enhancing MSZW in ketoprofen crystallization.
- To provide insights for efficient chiral separation of ketoprofen via crystallization.
Main Methods:
- Studied the effects of temperature, cooling rate, stirring rate, and solvent composition (water/ethanol) on MSZW.
- Utilized L9 fractional experimental design for systematic investigation.
- Analyzed MSZW for racemic (R,S)-ketoprofen and enantiomerically enriched (S)-ketoprofen.
Main Results:
- MSZW increased with higher cooling rates.
- MSZW decreased with increased temperature and ethanol volume ratio.
- The ethanol ratio demonstrated the most significant impact on enhancing MSZW.
Conclusions:
- Optimized conditions for enhanced MSZW include a water-to-ethanol volume ratio of 1:0.6, temperature of 20°C, stirring rate of 700 rpm, and cooling rate of 12.0°C/h.
- These optimized parameters are beneficial for the subsequent chiral separation of ketoprofen.
- The study provides a foundation for scalable and efficient enantioseparation of ketoprofen through crystallization.