Microwave-assisted extraction at atmospheric pressure coupled to different clean-up methods for the determination of organophosphorus pesticides in olive and avocado oil
Author
dc.contributor.author
Fuentes, Edwar
Author
dc.contributor.author
Báez, María E.
Author
dc.contributor.author
Díaz, Juan
Admission date
dc.date.accessioned
2018-12-20T15:04:17Z
Available date
dc.date.available
2018-12-20T15:04:17Z
Publication date
dc.date.issued
2009
Cita de ítem
dc.identifier.citation
Journal of Chromatography A, Volumen 1216, Issue 51, 2018, Pages 8859-8866
Identifier
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00219673
Identifier
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10.1016/j.chroma.2009.10.082
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/157521
Abstract
dc.description.abstract
An effective extraction method was devised for the determination of organophosphorus pesticides (OPPs) in olive and avocado oil samples, using atmospheric pressure microwave-assisted liquid-liquid extraction (APMAE) and solid-phase extraction or low-temperature precipitation as clean-up step. A simple glass system equipped with an air-cooled condenser was designed as an extraction vessel. The pesticides were partitioned between acetonitrile and oil solution in hexane. Analytical determinations were carried out by gas chromatography-flame photometric detection and gas chromatography-tandem mass spectrometry, using a triple quadrupole mass analyzer, for confirmation purposes. Several factors influencing the extraction efficiency were investigated and optimized through fractional factorial design and Doehlert design. Under optimal conditions the recovery of pesticides from oil at 0.025 μg g-1 ranged from 71% to 103%, except for fenthion in avocado oil, with RSDs ≤13% (n = 5). The LOQ for
Microwave-assisted extraction at atmospheric pressure coupled to different clean-up methods for the determination of organophosphorus pesticides in olive and avocado oil