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[Method establishment for the determination of 8 organophosphorus pesticides in serum using LC/MS/MS]
Zhirong Zhou1, Jun Wang, Shaobin Lin
1Institute for Environmental Health and Related Product Safety, Chinese CDC, Beijing 100021, China.
Objective:
To establish the method to determine the presence and concentration of 8 organophosphors pesticides in serum by LC/MS/MS.
Method:
The serum samples were extracted by ethyl acetateether and then separated on C18 5 microm (2.1 mm x 150 mm) column with pH = 3.5 acid-ammonium acetate buffer solution, methanol--water as mobile phase to mixed gradient elution. Electro-spray ionization source (ESI) was applied and operated in positive ion mode, and multiple reaction monitoring(MRM) mode was adopted.
Result:
Within concentration ranging from 0-1000 ng/ml the correlation coefficient for each compound was greater than 0.990, recoveries were between 95%-129%, RSD < 7.9%. The RSD of intra-day and inter-day were less 12% (n = 6).
Conclusion:
The procedure of preparing serum samples is sample and the result of this method is efficient, accurate and specific.
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