Influência dos constituintes químicos dos extratos de diferentes matrizes na resposta cromatográfica de agrotóxicos Influence of the chemical constituents of extracts from different matrices in the pesticide chromatographic response

• Main Authors: Gevany Paulino de Pinho, Flaviano Oliveira Silvério, Antônio Augusto Neves, Maria Eliana L. R. Queiroz, Maria Antônia V. M. Starling
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2010-01-01
• Series: Química Nova
• Subjects: matrix effect; pesticides; PCA
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422010000400028

<abstract language="eng">Multiresidue methods for pesticides monitoring by GC are commonly employed, however, it is well known that the presence of compounds of the matrix introduces errors during the quantiûcation. The main consequence of matrix effect is an increasing or decreasing analyte signal after the GC saturation with extracts of matrix. In this paper, the influence of constituents of nine matrices on the quantification of the four pesticides by GC-ECD was studied. Variation of signal was evaluated by PCA and HCA, and results showed that the constituents of tomato increased the signal (until 300%), while extracts of apple decreased (until -20%). Variation the analyte signal in the presence of the matrix in respect to the same analyte in solvent (standard solution) also was observed, mainly for liver extract (until 270%).