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Quantitative analysis of phenobarbital in biological fluids: Analyte enrichment by an electrically-assisted microextraction technique 60
Yaripour,Saeid; Ebrahimi,Shahriar; Mohammadi,Ali.
An electrically-assisted microextraction method called electromembrane extraction, followed by a simple high performance liquid chromatography and ultraviolet detection was developed and validated for determining phenobarbital in biological samples. The major parameters influencing the electromembrane extraction procedure including solvent composition, voltage, pH of acceptor and donor solutions, salt effect, and time of extraction were evaluated and optimized. The drug was extracted from the donor aqueous sample solution (pH 9) to the acceptor aqueous solution (pH 13). The donor and acceptor phases were separated by a hollow fiber dipped in 1-octanol as a supported liquid membrane. A voltage of 40 V during 20 minutes was applied as the driving force. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological samples; Electromembrane extraction; HPLC-UV; Microextraction; Phenobarbital.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100543
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Evaluation of volatile profiles obtained for minimally-processed pineapple fruit samples during storage by headspace-solid phase microextraction gas chromatography-mass spectrometry 116
TURAZZI,Francielle Crocetta; MORÉS,Lucas; MERIB,Josias; CARASEK,Eduardo; NARAIN,Narendra; LIMA,Lucélia Kátia de; NUNES,Maria Lúcia.
Abstract This paper describes the application of the solid-phase microextraction (SPME) technique for the determination and monitoring of the volatile profile of minimally-processed pineapple fruit stored at various temperatures (-12 °C, 4 °C and 25 °C) for different periods (1, 4 and 10 days). The SPME fiber coating composed of Car/PDMS presented the best performance. The optimal extraction conditions obtained through a Doehlert design were 60 min at 35 °C. The profiles for the volatile compounds content of the fruit at each stage of storage were determined by gas chromatography-mass spectrometry (GC-MS). The variation in the volatile profile over time was greater when the fruit samples were stored at 25 °C and at -12 °C compared to 4 °C. Thus, according...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Volatile profile; Pineapple; Minimally processed; Microextraction; Gas chromatography.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000400663
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Aplicação da microextração em fase sólida na determinação de resíduos de agrotóxicos em alimentos. 14
CASTRO, I. M. de; ANJOS, M. R. dos; QUINTEIRO, L. M. da C..
Tipo: Folhetos Palavras-chave: Microextração em fase sólida; Agrotóxico; Resíduo químico; Alimento; Microextraction; Solid phase extraction; Chemical residues; Foods.
Ano: 2010 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/872982
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