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Type: Artigo de periódico
Title: Simultaneous Optimization By Neuro-genetic Approach Of A Multiresidue Method For Determination Of Pesticides In Passiflora Alata Infuses Using Headspace Solid Phase Microextraction And Gas Chromatography.
Author: da Silva, Gilmare Antônia
Augusto, Fabio
Poppi, Ronei Jesus
Abstract: A simultaneous optimization strategy based on neuro-genetic approach has been applied to a HS-SPME-GC-ECD (Headspace Solid Phase Microextraction coupled to Gas Chromatography with Electron Capture Detection) method for simultaneous determination of the pesticides chlorotalonil, methyl parathion, malathion, alpha-endosulfan and beta-endosulfan in herbal infusions of Passiflora alata (Dryander). Two types of extractive fibers were used: a home-made device coated by sol-gel process with polydimethylsiloxane-poly(vinyl alcohol) (PDMS/PVA) and a commercial PDMS. The effects of extraction parameters such as dilution of the infusion, extraction temperature and time, as well as sample ionic strength were evaluated through the Doehlert design. To find a model that could relate these extraction parameters with the extraction efficiency of all pesticide simultaneously, a Bayesian Regularized Artificial Neural Network (BRANN) approach was employed. Subsequently, Genetic Algorithm (GA) was applied to attain the optimum values from the model developed by the neural network. The use of the proposed approach allowed the determination of a single extraction condition that maximized the peak areas of all pesticides simultaneously, showing a promising and a suitable new procedure to the optimization process of complex analytical problems.
Subject: Algorithms
Chromatography, Gas
Models, Theoretical
Reproducibility Of Results
Solid Phase Microextraction
Citation: Journal Of Chromatography. A. v. 1138, n. 1-2, p. 251-61, 2007-Jan.
Rights: fechado
Identifier DOI: 10.1016/j.chroma.2006.10.075
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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