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LC-MS/MS method for the determination of melamine in rat plasma: toxicokinetic study in Sprague-Dawley rats
Feng Yang1, Yu Mao, Xiaodong Zhang
1College of Pharmacy, Department of Chemistry, Second Military Medical University, Shanghai, China.
Abstract:
Most recently, melamine has raised international concern for its catastrophic health effects stemming from tainted infant formula. So far there is limited information concerning the pharmacokinetics of melamine in mammals. The present report concerns the development and validation of a sensitive HPLC-ESI-MS/MS method for the pharmacokinetic study of melamine in rat. The method employed a simple liquid-liquid extraction process for plasma sample cleanup, and the extraction recoveries of melamine from plasma were consistent at different concentrations. There was a linear relationship between chromatographic area and concentration over the range of 10-5000 ng/mL for melamine in plasma (R = 0.995). In this work, for the first time, melamine was administered intravenously and orally to Sprague-Dawley rats and the pharmacokinetic characteristics of this contaminant were investigated. The mean values of major pharmacokinetic parameters of oral availability, the mean steady-state distribution volume (V(ss)), clearance, and plasma elimination half-life (T(1/2)) of melamine in Sprague-Dawley rats were 72.9 +/- 13.2%, 102.5 +/- 12.5 mL/kg, 20.1 +/- 3.8 mL/h/kg, and 4.9 +/- 0.5 h, respectively. The rats pharmacokinetic study results suggested that melamine was predominantly restricted to blood or extracellular fluid and is not extensively distributed to most organ tissues. Meanwhile, melamine should be primarily eliminated by renal filtration for rats and does not undergo significant metabolism. These data should be useful to regulatory for risk assessment.
Insights
This study details the pharmacokinetics of melamine in rats, revealing it is mainly eliminated by the kidneys and stays in the blood. These findings are crucial for assessing the health risks of melamine contamination.
Area of Science:
- Toxicology
- Pharmacology
- Analytical Chemistry
Background:
- Melamine contamination in food, especially infant formula, poses significant health risks.
- Limited data exists on the pharmacokinetics of melamine in mammals.
Purpose of the Study:
- To develop and validate a sensitive HPLC-ESI-MS/MS method for melamine analysis in rat plasma.
- To investigate the pharmacokinetic characteristics of melamine in Sprague-Dawley rats after intravenous and oral administration.
Main Methods:
- Development and validation of a High-Performance Liquid Chromatography-Electrospray Ionization-Tandem Mass Spectrometry (HPLC-ESI-MS/MS) method.
- Liquid-liquid extraction for plasma sample cleanup.
- Pharmacokinetic analysis in Sprague-Dawley rats following IV and oral melamine administration.
Main Results:
- A linear relationship was observed between chromatographic area and melamine concentration (10-5000 ng/mL).
- Key pharmacokinetic parameters in rats included: oral availability (72.9%), V(ss) (102.5 mL/kg), clearance (20.1 mL/h/kg), and T(1/2) (4.9 h).
- Melamine was primarily restricted to blood/extracellular fluid, suggesting limited tissue distribution, and was mainly eliminated via renal filtration with minimal metabolism.
Conclusions:
- The developed HPLC-ESI-MS/MS method is sensitive and reliable for melamine pharmacokinetic studies.
- Melamine exhibits limited distribution and is primarily renally cleared in rats.
- These findings provide valuable data for regulatory risk assessment of melamine exposure.
