Stacking enhanced determination of steroids by CE

Area of Science:

• Analytical Chemistry
• Biochemistry
• Environmental Science

Background:

• Steroid analysis is crucial for understanding biological processes.
• Existing methods for steroid profiling can be time-consuming and complex.
• Development of rapid and sensitive analytical techniques is needed.

Purpose of the Study:

• To develop a simple, pH-mediated stacking method for analyzing natural and synthetic steroids.
• To enhance the sensitivity and efficiency of steroid separation using capillary electrophoresis.
• To apply the developed method for steroid profiling in biological matrices.

Main Methods:

• Utilized pH-mediated stacking with carboxymethyl-beta-cyclodextrin (CM-β-CD) at pH 10.
• Separated steroidal compounds using capillary electrophoresis with a running buffer containing hydroxypropyl-beta-cyclodextrin (HP-β-CD) and SDS at pH 2.5.
• Employed electrokinetic injection for sample introduction.

Main Results:

• Achieved steroid separation in under 5 minutes.
• Established limits of detection for various steroids ranging from 2 to 14 nM.
• Demonstrated good reproducibility for migration time (< or =1% within-day, < or =2% day-to-day) and peak area (< or =9% within-day, < or =22% day-to-day).
• Successfully applied the method to analyze steroids in fish plasma.

Conclusions:

• The developed method offers a simple and efficient approach for steroid analysis.
• The technique shows potential for high-throughput profiling of multiple steroids in biological samples.
• This method could be valuable for endocrine research and environmental monitoring.