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Simultaneous optimization of the microextraction of coffee volatiles using response surface methodology and principal component analysis
Abstract It is well known that no single experimental condition can be found under which the extraction of all the volatile compounds in a gas chromatographic analysis of roasted coffee beans byExpand
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New sorbents for extraction and microextraction techniques.
This review outlines recent progress in the research on some new classes of sorbents for extraction and microextraction techniques. Carbon nanotubes are allotropes of carbon with cylindricalExpand
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Detection of extraction artifacts in the analysis of honey volatiles using comprehensive two-dimensional gas chromatography.
Extraction using headspace solid phase microextraction (HS-SPME) coupled to comprehensive two-dimensional gas chromatography with flame ionisation detection (GC×GC-FID) was employed to evaluate theExpand
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Determination of fuel origin by comprehensive 2D GC-FID and parallel factor analysis
In this work, a method for differentiation of gasoline according to its geographical origin is presented. Comprehensive two-dimensional gas chromatography-flame ionization detection (GC×GC-FID)Expand
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Molecularly imprinted sol-gel silica for solid phase extraction of phenobarbital
A molecularly imprinted organically modified silica was prepared through a simple sol-gel procedure, and evaluated as specific sorbent for solid-phase extraction (SPE) of phenobarbital from aqueousExpand
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Application of headspace solid phase microextraction and gas chromatography to the screening of volatile compounds from some Brazilian aromatic plants
SummaryAn HS-SPME method was developed and applied for the isolation of volatile organic compounds from plants native or acclimatized to Brazil. Method optimization was performed using typicalExpand
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A Headspace Solid Phase Microextraction (HS-SPME) method for the chromatographic determination of alkylpyrazines in cocoa samples
A Headspace Solid Phase Microextraction (HS-SPME) procedure for isolation and determination of alkylpyrazines in cocoa liquor, using Gas Chromatography with Flame Ionization Detection (GCFID) for theExpand
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Effect of autoclaving cocoa nibs before roasting on the precursors of the Maillard reaction and pyrazines
Summary Nibs of raw cocoa (N) were roasted (R) at 150 ∞C for 38 min. Some samples were autoclaved at 121 ∞C for 15 min (A) and roasted (AR) at 150 ∞C for 38 min. The samples were then analysed forExpand
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Exploratory Analysis of Biodiesel by Combining Comprehensive Two-Dimensional Gas Chromatography and Multiway Principal Component Analysis
Comprehensive two-dimensional gas chromatography (GC×GC) was used in this work in order to reveal and identify minor compounds of several raw materials in biodiesel samples, which are not detected byExpand
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Isolation and Quantification of Dialkylmercury Species by Headspace Solid Phase Microextraction and Gas Chromatography with Atomic Emission Detection
Foi desenvolvida uma metodologia para quantificar compostos dialquilmercuricos usando Microextracao em Fase Solida em Headspace (HS-SPME) e Cromatografia Gasosa com Deteccao por Emissao AtomicaExpand
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