Microchimica Acta

, Volume 170, Issue 3–4, pp 289–297 | Cite as

Myeloperoxidase-mediated oxidation of organophosphorus pesticides as a pre-step in their determination by AChE based bioanalytical methods

  • Tamara Lazarević Pašti
  • Tatjana Momić
  • Antonije Onjia
  • Ljubodrag Vujisić
  • Vesna VasićEmail author
Original Paper


In order to improve the sensitivity of assays for inhibitors of the enzyme acetylcholine esterase (AChE), an effective method was developed for the conversion of the organophosphate pesticides (OPs) diazinon, malathion, chlorpyrifos, azinphos-methyl and phorate into more toxic inhibitors. This was accomplished by converting them from the thio form into their oxo form using the enzyme myeloperoxidase. The oxo forms, which are the only products of conversion, were determined by AChE bioassays, using either the free enzyme, or a flow injection analysis manifold with immobilized AChE and spectrophotometric detection. All modified OPs exhibited inhibitory power at ppb levels and within 10 min. The method is considered to represent an excellent means for improving the sensitivity of assays for determination of OPs.


Organophosphate pesticides Myeloperoxidase Oxidation Bioanalytics Acethylcholinesterase 



The authors are grateful to Dr A. Tomašević from the Pesticide and Environment Research Institute, Belgrade, Republic of Serbia, for providing OPs. We wish to express our gratitude to the Ministry of Science and Environmental Protection of the Republic of Serbia supported this work.

Supplementary material

604_2010_324_MOESM1_ESM.doc (236 kb)
ESM 1 (DOC 236 kb)


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Tamara Lazarević Pašti
    • 1
  • Tatjana Momić
    • 1
  • Antonije Onjia
    • 1
  • Ljubodrag Vujisić
    • 2
  • Vesna Vasić
    • 1
    Email author
  1. 1.Vinča Institute of Nuclear SciencesBelgradeRepublic of Serbia
  2. 2.Institute of Chemistry, Technology and MetallurgyBelgradeRepublic of Serbia

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