Potential of a metal-organic framework as a new material for solid-phase extraction of pesticides from lettuce (Lactuca sativa), with analysis by gas chromatography-mass spectrometry

• Published in: Journal of separation science Vol. 33; no. 23-24; pp. 3811 - 3816
• Main Authors: Barreto, Alysson S, da Silva, Rogério Luiz, dos Santos Silva, Silvia Caroline G, Rodrigues, Marcelo O, de Simone, Carlos A, de Sá, Gilberto F, Júnior, Severino A, Navickiene, Sandro, de Mesquita, Maria Eliane
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley-VCH Verlag 01.12.2010; WILEY-VCH Verlag; WILEY‐VCH Verlag; Wiley
• Subjects: Biological and medical sciences; Extraction; Food industries; Fruit and vegetable industries; Fundamental and applied biological sciences. Psychology; Gas Chromatography-Mass Spectrometry - methods; Lactuca - chemistry; Lettuce; Lettuces; Limit of Detection; Matrix solid-phase dispersion; Metal-organic framework; Metal-organic frameworks; Pesticides; Pesticides - analysis; Reference Standards; Reproducibility of Results; Silica gel; SIM; Solid Phase Extraction - instrumentation; Sorbents; Spectrometry; Spectroscopy; Spectroscopy, Fourier Transform Infrared; Solid phase extraction; Chemical analysis; Insecticide; Vegetables; Systemic; Compositae; Chemical enrichment; Lettuce; Sample preparation; Dicotyledones; Angiospermae; Adsorbent; Lactuca sativa; Quantitative analysis; Matrix Solid Phase Dispersion extraction; Trace analysis; Metal organic framework; Coupled method; Pesticides; Malathion; Matrix solid-phase dispersion; Contamination; Fungicide; Gas chromatography; Vegetable crop; Residue; Organophosphorus compounds; Spermatophyta; Metal-organic framework; Mass spectrometry
• ISSN: 1615-9306; 1615-9314; 1615-9314
• DOI: 10.1002/jssc.201000553

The metal-organic framework ∞[(La₀.₉Eu₀.₁)₂(DPA)₃(H₂O)₃] was tested for extraction of pyrimicarb, procymidone, malathion, methyl parathion and α- and β-endosulfan from lettuce, with analysis using GC/MS in SIM mode. Experiments were carried out in triplicate at two fortification levels (0.1 and 0.5 mg/kg), and resulted in recoveries in the range of 78-107%, with RSD values between 1.6 and 8.0% for ∞[(La₀.₉Eu₀.₁)₂(DPA)₃(H₂O)₃] sorbent. Detection and quantification limits ranged from 0.02 to 0.05 mg/kg and from 0.05 to 0.10 mg/kg, respectively, for the different pesticides studied. The method developed was linear over the range tested (0.05-10.0 μg/mL), with correlation coefficients ranging from 0.9990 to 0.9997. Comparison between ∞[(La₀.₉Eu₀.₁)₂(DPA)₃(H₂O)₃] and conventional sorbent (silica gel) showed better performance of the ∞[(La₀.₉Eu₀.₁)₂(DPA)₃(H₂O)₃] polymeric sorbent for all pesticides tested.