Chiral separation of cefadroxil by capillary electrochromatography

Area of Science:

• Analytical Chemistry
• Separation Science
• Pharmaceutical Analysis

Background:

• Chiral separation of pharmaceuticals is crucial for drug efficacy and safety.
• Cefadroxil is an important antibiotic requiring enantiomeric purity assessment.
• Capillary electrochromatography (CEC) offers high efficiency for complex separations.

Purpose of the Study:

• To develop and optimize a capillary electrochromatography (CEC) method for the chiral separation of cefadroxil enantiomers.
• To prepare a monolithic capillary column suitable for enantioseparation.
• To investigate the influence of various parameters on the separation performance.

Main Methods:

• Preparation of a monolithic capillary column.
• Optimization of buffer composition (sodium acetate, acetic acid, beta-cyclodextrin, isopropanol, formamide) and pH.
• Application of CEC with UV detection.
• Systematic investigation of buffer pH, beta-cyclodextrin concentration, isopropanol concentration, and voltage.

Main Results:

• An optimized buffer system (28.5 mmol/L sodium acetate, 0.95% acetic acid, 19 mmol/L beta-CD, 5% isopropanol in formamide, pH 7.0) was established.
• High column efficiencies (N1=5324, N2=23,768) were achieved for cefadroxil enantiomers.
• A selectivity factor (alpha) of 1.056 and resolution (Rs) of 0.978 were obtained, indicating effective separation.

Conclusions:

• The developed monolithic capillary electrochromatography method provides an efficient approach for the chiral separation of cefadroxil.
• The study demonstrates the potential of CEC with beta-cyclodextrin as a chiral selector for pharmaceutical enantiomer analysis.
• Further optimization could enhance resolution and efficiency for cefadroxil enantiomer separation.