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Evaluation of alternative sorbents for dispersive solid‐phase extraction clean‐up in the QuEChERS method for the determination of pesticide residues in rice by liquid chromatography with tandem mass spectrometry
Author(s) -
Cabrera Liziara da C.,
Caldas Sergiane S.,
Prestes Osmar D.,
Primel Ednei G.,
Zanella Renato
Publication year - 2016
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201501204
Subject(s) - quechers , chromatography , chemistry , sorbent , solid phase extraction , extraction (chemistry) , detection limit , mass spectrometry , clean up , liquid chromatography–mass spectrometry , pesticide , tandem mass spectrometry , pesticide residue , adsorption , organic chemistry , agronomy , biology
Many compounds are used for pest control during the production and storage of rice, making it necessary to employ multiclass methods for pesticide residues determination. For this purpose, QuEChERS‐based methods are very efficient, fast and accurate, and improvements in the clean‐up step are important, especially for complex matrices, like cereals. In this work, different sorbents such as chitosan, florisil ® , alumina, diatomaceous earth, graphitized carbon black, besides the commonly used primary secondary amine and octadecylsilane, were evaluated for dispersive solid‐phase extraction clean‐up in acetate‐buffered QuEChERS method for the determination of residues of 20 representative pesticides and one metabolite in rice by liquid chromatography coupled to tandem mass spectrometry. The sorbent C18 presented the best results, however, chitosan showed similar results, and the best performance among the unconventional sorbents evaluated. The method limit of quantification, attending accuracy (70–120% recovery) and precision (RSD ≤20%) criteria, ranged from 5 to 20 μg/kg. Results showed that chitosan is an effective alternative to reduce analysis costs, maintaining the method reliability and accuracy.