Steroid determination in fish plasma using capillary electrophoresis
Liliya Bykova1, Stephanie A Archer-Hartmann, Lisa A Holland
1C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506 USA.
Environmental Toxicology and Chemistry
|September 8, 2010
Summary
This study developed a capillary electrophoresis method for simultaneous analysis of steroid hormones in yellow perch plasma. The method accurately quantifies key hormones like testosterone and 17beta-estradiol, offering insights into fish endocrine health.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Endocrinology
Background:
- Steroid hormones play crucial roles in fish physiology and reproduction.
- Monitoring hormone levels in wild fish populations is essential for assessing environmental impacts and endocrine disruption.
- Existing analytical methods may lack the sensitivity or specificity for simultaneous determination of multiple steroids in complex biological matrices.
Purpose of the Study:
- To develop and validate a capillary electrophoresis method for the simultaneous determination of circulating steroid hormones in yellow perch (Perca flavescens) plasma.
- To assess the levels of key steroid hormones in wild yellow perch populations from natural aquatic environments.
- To provide a tool for monitoring endocrine health and hormonal fluctuations in fish.
Main Methods:
- Capillary electrophoresis with pH-mediated stacking for enhanced sensitivity and separation.
- Simultaneous determination of eight steroid standards, with method validation for four key steroids.
- Extraction and purification of plasma samples using ethyl acetate, anion exchange, and hydrophobic solid phase extraction.
- Quantification using external standards and calibration curves.
Main Results:
- The method demonstrated within-day reproducibility of migration time < or =2% for key steroids.
- High recovery rates for testosterone (84%) and 17beta-estradiol (85%) from yellow perch plasma.
- Quantified endogenous levels of testosterone (0.9-44 ng/ml) and 17alpha,20beta-dihydroxypregn-4-en-3-one (5-34 ng/ml).
- Testosterone levels correlated well with immunoassay results; 17beta-estradiol levels were < or =1.7 ng/ml.
Conclusions:
- The developed capillary electrophoresis method is effective for simultaneous analysis of steroid hormones in fish plasma.
- The method provides valuable data for assessing endocrine status and environmental influences on wild fish populations.
- Monitoring multiple steroid hormones offers comprehensive insights into fish hormonal fluctuations and health.
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