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A chemometric approach toward the detection and quantification of coffee adulteration by solid-phase microextraction using polymeric ionic liquid sorbent coatings
- Source :
- Journal of chromatography. A. 1346
- Publication Year :
- 2014
-
Abstract
- Solid-phase microextraction (SPME) using cross-linked polymeric ionic liquid (PIL)-based sorbent coatings was used to extract volatile aroma-related compounds from coffee samples. Several PIL-based coatings were screened alongside a commercial poly(acrylate) (PA) SPME coating. The best performing PIL-based SPME fiber, poly(1-vinyl-3-hexadecylimidazolium bis[(trifluoromethyl)sulfonylimide]) with 50% (w/w) 1,12-di(3-vinylbenzylimidazolium)dodecane dibis[(trifluoromethyl)sulfonyl]imide incorporated cross-linker, was used to isolate the volatile fraction of Arabica coffee. To illustrate the importance of trace analyte isolation, a method for the detection and quantification of coffee adulteration is described. Chromatographic profiles obtained by gas chromatography/mass spectrometry (GC/MS) were used to create the chemometric model. Partial least squares (PLS) regression was employed to correlate the aroma-related chemical fingerprint to the degree of adulteration. The proposed method successfully detected fraud down to 1% (w/w) of adulterant and accurately determined the degree of coffee adulteration (i.e, root mean square error of calibration and prediction of 0.54% and 0.83% (w/w), respectively). Finally, important aroma-related compounds including furans, methoxyphenols, pyrazines, and ketones were identified.
- Subjects :
- Adulterant
Analyte
Sorbent
Chromatography
Chemistry
Dodecane
Polymers
Organic Chemistry
Ionic Liquids
Coffea
General Medicine
Mass spectrometry
Solid-phase microextraction
Biochemistry
Gas Chromatography-Mass Spectrometry
Analytical Chemistry
chemistry.chemical_compound
Food Quality
Food Technology
Regression Analysis
Gas chromatography
Gas chromatography–mass spectrometry
Solid Phase Microextraction
Subjects
Details
- ISSN :
- 18733778
- Volume :
- 1346
- Database :
- OpenAIRE
- Journal :
- Journal of chromatography. A
- Accession number :
- edsair.doi.dedup.....30e5b1a24f9f55ef58686e908a677333