Optimized methods for capillary electrophoresis of tetracyclines

Area of Science:

• Analytical Chemistry
• Pharmaceutical Analysis

Background:

• Accurate quantification of tetracyclines is crucial for drug safety and efficacy.
• Existing liquid chromatography methods for tetracycline analysis can be time-consuming and complex.
• Identification and separation of tetracycline impurities are essential for quality control.

Purpose of the Study:

• To develop and optimize capillary electrophoresis (CE) methods for the separation of tetracycline, oxytetracycline, and demeclocycline.
• To achieve effective separation of these tetracyclines from their major impurities, such as 2-acetyl-2-decarboxamido derivatives.
• To compare the performance of the developed CE methods with established liquid chromatography (LC) techniques.

Main Methods:

• Systematic investigation of buffer pH and concentration for optimal separation.
• Utilization of non-ionic surfactant Triton X-100 to enhance selectivity.
• Employing methyl-beta-cyclodextrin for improved resolution of specific tetracyclines.
• Capillary electrophoresis (CE) as the primary analytical technique.

Main Results:

• Optimized buffer systems enabled efficient separation of tetracycline, oxytetracycline, and demeclocycline from impurities.
• Triton X-100 and methyl-beta-cyclodextrin significantly improved selectivity for oxytetracycline and demeclocycline.
• The developed CE methods demonstrated good correlation with existing liquid chromatography methods.
• Successful separation of 2-acetyl-2-decarboxamido impurities was achieved.

Conclusions:

• Capillary electrophoresis offers a viable and efficient alternative for analyzing tetracyclines and their impurities.
• The optimized CE methods provide high selectivity and accuracy, suitable for pharmaceutical quality control.
• This study validates CE as a powerful tool for the analysis of tetracycline antibiotics.