Optimization of the liquid–liquid extraction method and low temperature purification (LLE–LTP) for pesticide residue analysis in honey samples by gas chromatography

Food Control ◽  
2010 ◽  
Vol 21 (10) ◽  
pp. 1307-1311 ◽  
Author(s):  
Gevany Paulino de Pinho ◽  
Antônio Augusto Neves ◽  
Maria Eliana Lopes Ribeiro de Queiroz ◽  
Flaviano Oliveira Silvério
Keyword(s):  
Gas Chromatography ◽  
Low Temperature ◽  
Pesticide Residue ◽  
Extraction Method ◽  
Residue Analysis ◽  
Liquid Extraction ◽  
Pesticide Residue Analysis ◽  
Liquid Liquid Extraction

scholarly journals MINIATURIZED LIQUID-LIQUID EXTRACTION WITH LOW-TEMPERATURE PARTITIONING TECHNIQUE (LLE/LTP) FOR PESTICIDE ANALYSIS IN A BIOLOGICAL MATRIX BY GAS CHROMATOGRAPHY

Química Nova ◽  
2021 ◽  
Author(s):  
Thaís Silva ◽  
Maria Eliana Queiroz ◽  
Antônio Neves ◽  
Patrícia Vieira ◽  
André Oliveira ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Low Temperature ◽  
Blood Serum ◽  
Liquid Extraction ◽  
Serum Samples ◽  
Biological Matrix ◽  
Rural Workers ◽  
Extraction Solvent ◽  
Liquid Liquid Extraction ◽  
Partitioning Technique

The liquid-liquid extraction with low-temperature partitioning technique (LLE/LTP) was miniaturized to determine the pesticides chlorpyrifos, bifenthrin, λ-cyhalothrin, and deltamethrin in a biological matrix, by gas chromatography. The method was proposed for fetal-bovine serum samples (500 μL), by using a full factorial design (23) with one center point. The evaluated factors included the volume of water added to the sample (1000 μL), volume of extraction solvent (500 μL) and stirring time (60 s) – a cleanup step was not necessary. The method was validated for the main figures of merit. The results indicated that the LLE/LTP/GC/ECD miniaturized method was efficient in extracting pesticides from blood-serum samples (75 to 115%). It showed both selectivity and sensitiveness, with limits of quantification (LOQ) ranging from 8 at 17 μg L-1. Once validated, the method was applied to blood-serum samples of rural workers from a city in the Brazilian state of Minas Gerais. In that case, the presence of chlorpyrifos was detected in two of the samples.

Assessment of matrix effects in gas chromatography electron capture pesticide-residue analysis

2003 ◽  
Vol 57 (9-10) ◽  
pp. 657-664 ◽  
Author(s):  
M. E. Hernández Torres ◽  
F. J. Egea González ◽  
L. Cuadros-Rodríguez ◽  
E. Almansa López ◽  
J. L. Martínez Vidal
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residue ◽  
Matrix Effects ◽  
Residue Analysis ◽  
Pesticide Residue Analysis
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