title: A method for the analysis of organophosphorus pesticide residues in Mexican axolotl.
abstract: A method based on matrix solid-phase dispersion (MSPD) was developed for quantitative extraction of three organophosphorus pesticides (OPPs) from the Mexican axolotl, Ambystoma mexicanum. The determination was carried out using high- performance liquid chromatography (HPLC) with diode array spectrophotometric UV detection (DAD). The MSPD extraction with octadecylsilyl (C18) sorbent combined with a silica gel clean-up and acetonitrile elution was optimised for chlorpyrifos, fenthion and methyl parathion. The method was validated, yielding recovery values higher than 90%. The precision, expressed as the relative standard deviation (RSD), was less than or equal to 6% in muscle samples at spiking levels of 10 and 5 ppm. Linearity was studied from 15 to 60 ppm for chlorpyrifos and fenthion, and from 7.5 to 30 ppm for methyl parathion. The limits of detection (LODs) were found to be less than or equal to 0.5 ppm. This method was applied to the analysis of samples from a chlorpyrifos-exposed axolotl, demonstrating its use as an analytical tool for toxicological studies.
authors.affiliation: Facultad de Química de la Universidad Nacional Autónoma de Mexico (UNAM), México, D.F., México. pgcllas@servidor.unam.mx
authors.forename: Martha P
authors.initials: MP
authors.lastname: García de Llasera
authors.forename: Leopoldo
authors.initials: L
authors.lastname: Cruz-Reyes
authors.forename: Luz E
authors.initials: LE
authors.lastname: Vera-Avila
mesh_terms: D000558:Ambystoma mexicanum / Q000378:metabolism*; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004784:Environmental Monitoring; D009943:Organophosphorus Compounds / Q000032:analysis* / Q000378:metabolism; D010573:Pesticide Residues / Q000032:analysis* / Q000378:metabolism; D052616:Solid Phase Extraction / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D009943:Organophosphorus Compounds; D010573:Pesticide Residues