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[Determination of 1-methylhydantoin Concentration in Blood by GC-MS Method and Its Application in Forensic Medicine]
1School of Forensic Medicine, China Medical University, Shenyang 110013, China.
Objectives:
To establish a gas chromatographic-mass spectrometric (GC-MS) analysis method for quantifying 1-methylhydantoin concentration in whole blood. To provide technical support to forensic identification related cases of 1-methylhydantoin.
Methods:
As an internal standard, 500 ng SKF525A was added to 0.5 mL blood sample, and then 2 mL 0.01 mol/L dilute hydrochloric acid and 0.5 g ammonium carbonate were added in order to buffer the pH value to 9, and following 2 mL ethyl acetate. The organic solvent layer was obtained after centrifuge and then analysed by GC-MS after drying.
Results:
Good linear relationship of 1-methylhydantoin in blood was obtained in the range of 0.5-50 ng/mL. The equation of linear regression was y=0.015 51 x+0.007 26(R²=0.999 7) with 0.1 ng/mL detection limit, and the recovery was 93.02%-108.12%. The intra-day and inter-day precision were less than 6.07% and 13.37%, respectively.
Conclusions:
The results gotten by this method is accurate and reproducible, which can be used for the determination of 1-methylhydantoin concentration in blood samples.
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