Abstract

KOLBERG, Diana I.; PRESTES, Osmar D.; ADAIME, Martha B.  and  ZANELLA, Renato. A new gas chromatography/mass spectrometry (GC-MS) method for the multiresidue analysis of pesticides in bread. J. Braz. Chem. Soc. [online]. 2010, vol.21, n.6, pp. 1065-1070. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532010000600016.

In this work a method for the determination of 15 pesticides in bread samples using gas chromatography coupled with mass spectrometry (GC-MS), operating in the negative chemical ionization mode (NCI) was developed and validated. For the extraction procedure acetonitrile containing 1% (v/v) acetic acid was used in presence of sodium acetate, sodium citrate and magnesium sulphate. The method was validated evaluating the following parameters: linearity, limit of detection (LOD), limit of quantification (LOQ), precision and accuracy. The linear range used was from 1.0 to 100 µg L^-1. The recoveries had been considered satisfactory presenting values between 70 and 117% with RSD < 17.6% for almost all the compounds. The real method LOQ ranged from 10 to 20 µg kg^-1. The method shown to be adequate for the multiresidue analysis of pesticides in bread and the GC-MS (NCI) proved to be sensitive and highly selective.

Keywords : pesticides; multiresidue; bread; GC-MS.