Separation of the insecticidal pyrethrin esters by capillary electrochromatography

Area of Science:

• Analytical Chemistry
• Chromatography
• Electrochemistry

Background:

• Pyrethrins are natural insecticides with six active esters.
• Accurate quantification of these esters is crucial for formulation quality control.
• Existing analytical methods can be time-consuming or complex.

Purpose of the Study:

• To develop a simple and rapid method for separating and quantifying pyrethrin esters.
• To optimize capillary electrochromatography (CEC) conditions for pyrethrin analysis.
• To validate the method for use with both extracts and commercial insecticide formulations.

Main Methods:

• Capillary electrochromatography (CEC) was employed for direct separation.
• Optimization of stationary phase length, mobile phase composition, and column temperature.
• A ternary mobile phase (acetonitrile-aqueous buffer-tetrahydrofuran) and a C18 stationary phase were utilized.
• High voltage (30 kV) and controlled temperature (25°C) were applied.

Main Results:

• Successful separation of all six insecticidally active pyrethrin esters was achieved.
• The optimized method resolved the esters in under 16 minutes.
• Excellent separation was demonstrated for pyrethrins in commercial insecticide formulations.
• The CEC method proved to be a fast and easy quantification technique.

Conclusions:

• The developed CEC method provides a rapid, simple, and effective means for pyrethrin ester analysis.
• This technique is suitable for quality control of pyrethrin extracts and commercial products.
• Optimized CEC offers significant advantages in terms of speed and ease of use for pyrethrin quantification.