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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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The acceptance criteria for dissolution profile data are anchored in Q values, representing the percentage of drug dissolved within a specified period. This assessment unfolds in three stages:First Stage: The test passes if all six drug dosage units are equal to or greater than Q plus 5%; otherwise, the sample proceeds to the second stage.Second Stage: The average of twelve units must be equal to or greater than Q, with no unit falling below Q - 15% to pass; if not, it progresses to the final...
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Resolution of Racemic Guaifenesin Applying a Coupled Preferential Crystallization-Selective Dissolution Process:

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Preferential crystallization efficiently produces pure enantiomers from racemic mixtures. A novel coupled process (CPCD) resolves both enantiomers in one batch using selective dissolution and crystallization, showing industrial potential.

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Area of Science:

  • Chemical Engineering
  • Crystallization Science
  • Chiral Chemistry

Background:

  • Preferential crystallization is a cost-effective method for obtaining pure enantiomers from conglomerate systems.
  • Existing methods often require intermediate steps or specific chiral auxiliaries when pure enantiomers are unavailable.
  • The development of efficient enantioseparation techniques is crucial for pharmaceutical and chemical industries.

Purpose of the Study:

  • To introduce and evaluate a coupled Preferential Crystallization-selective Dissolution process (CPCD) for simultaneous production of both enantiomers from a racemic mixture.
  • To demonstrate the application of CPCD using a pharmaceutically relevant case study.
  • To present a strategy for process control using inline turbidity measurement.

Main Methods:

  • A two-reactor system coupling a crystallization tank and a dissolution tank was employed.
  • The process utilizes seeding with an available enantiomer and selective dissolution of the racemic feed.
  • Empirical optimization and inline turbidity measurements were used for process control and design.

Main Results:

  • The coupled Preferential Crystallization-selective Dissolution process (CPCD) successfully resolved racemic mixtures to produce both pure enantiomers within a single batch.
  • Optimized process design led to high productivities, indicating significant industrial applicability.
  • A control strategy based on inline turbidity measurement was successfully implemented.

Conclusions:

  • The CPCD process offers a promising and efficient approach for the simultaneous production of both enantiomers from racemic conglomerates.
  • This method overcomes limitations of traditional preferential crystallization by eliminating intermediate steps when one enantiomer is available.
  • The demonstrated industrial potential and effective process control highlight the value of CPCD for large-scale enantioseparation.