Analysis of chiral pharmaceuticals using HPLC with CD detection

Area of Science:

• Analytical Chemistry
• Pharmaceutical Analysis
• Chiral Separations

Background:

• Recent US FDA guidelines restrict the pharmaceutical market entry of chiral compound mixtures.
• Effective chiral detection and separation methods are now mandated for pharmaceutical development.
• This necessitates advanced analytical techniques for quality control and regulatory compliance.

Purpose of the Study:

• To describe the separation and detection of chiral pharmaceuticals using High-Performance Liquid Chromatography (HPLC) coupled with Circular Dichroism (CD) detection.
• To evaluate the performance of CD detection in comparison to Ultraviolet (UV) and Optical Rotation (OR) detectors for chiral pharmaceutical analysis.
• To demonstrate the applicability of this method to both over-the-counter (OTC) and prescription medications.

Main Methods:

• Chiral pharmaceutical compounds were analyzed using HPLC.
• Detection was performed using Circular Dichroism (CD), Ultraviolet (UV), and Optical Rotation (OR) detectors.
• The study analyzed OTC medications (Prilosec, naproxen sodium) and prescription drugs (Naproxen, Nexium, Coumadin).

Main Results:

• Both CD and UV detectors exhibited significantly higher sensitivity compared to the OR detector for chiral pharmaceutical analysis.
• While UV detection sometimes offered slightly better sensitivity, CD detection provided superior selectivity by exclusively responding to chiral compounds.
• The CD detector effectively eliminated interference from non-chiral components, ensuring accurate peak identification.

Conclusions:

• HPLC with CD detection is a highly effective method for the separation and detection of chiral pharmaceuticals.
• CD detection offers a significant advantage due to its specificity for chiral molecules, minimizing interference.
• This technique addresses the analytical challenges posed by new FDA guidelines for chiral drug development and quality control.