title: Optimisation of octadecyl (C18) sorbent amount in QuEChERS analytical method for the accurate organophosphorus pesticide residues determination in low-fatty baby foods with response surface methodology.
abstract: Three low-fatty baby food matrices were fortified with 0.01-0.2mg/kg of phorate, diazinon, chlorpyrifos and methidathion. A "quick, easy, cheap, effective, rugged and safe" - like method (QuEChERS) was used. Quantities of octadecyl (C18) sorbent differed with fortification level and matrix fat, based on central composite experimental design. Quantification was performed by Nitrogen-Phosphorus Detector gas chromatography, using matrix-matched standards. The highest (p<0.05) recoveries were observed for methidathion, the lowest fortification levels for a specific C18 amount and the lowest C18 amounts. In meals containing vegetables (1.9% fat) and lamb (3.0% fat), 180-210mg C18 gave recoveries from 67.0% to 105.0% and absence of co-extracts. Yogurt dessert (4.5% fat) required 200-230mg C18 for similar results. Recoveries could also be predicted with <20% error by a polynomial model. The results suggest that modified QuEChERS could be effectively used in the low-fatty baby meals residue analysis.
authors.affiliation: Agricultural University of Athens, Department of Food Science and Technology, Laboratory of Food Quality Control and Hygiene, Iera Odos 75, Athens 118 55, Greece.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Georgakopoulos
authors.affiliation: Agricultural University of Athens, Department of Food Science and Technology, Laboratory of Food Quality Control and Hygiene, Iera Odos 75, Athens 118 55, Greece.
authors.forename: Rodanthi
authors.initials: R
authors.lastname: Zachari
authors.affiliation: Agricultural University of Athens, Department of Food Science and Technology, Laboratory of Food Quality Control and Hygiene, Iera Odos 75, Athens 118 55, Greece.
authors.forename: Marios
authors.initials: M
authors.lastname: Mataragas
authors.affiliation: Agricultural University of Athens, Department of Food Science and Technology, Laboratory of Food Quality Control and Hygiene, Iera Odos 75, Athens 118 55, Greece.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Athanasopoulos
authors.affiliation: Agricultural University of Athens, Department of Food Science and Technology, Laboratory of Food Quality Control and Hygiene, Iera Odos 75, Athens 118 55, Greece.
authors.forename: Eleftherios H
authors.initials: EH
authors.lastname: Drosinos
authors.affiliation: Agricultural University of Athens, Department of Food Science and Technology, Laboratory of Food Quality Control and Hygiene, Iera Odos 75, Athens 118 55, Greece. Electronic address: pskan@aua.gr.
authors.forename: Panagiotis N
authors.initials: PN
authors.lastname: Skandamis
keywords: Baby food; Central composite design; Gas chromatography; Octadecyl; Pesticide residues; QuEChERS