Headspace gas chromatography–mass spectrometry determination of alkylpyrazines in cocoa liquor samples

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dc.contributor.authorSabrina Clavijo Roa
dc.contributor.authorYelitza Delgado Cayama
dc.contributor.authorLubin Gutierrez
dc.contributor.authorMaria del Rosario Brunetto
dc.contributor.authorGladys Ramos
dc.contributor.authorMaximo Gallignani
dc.contributor.authorAlexis Zambrano
dc.contributor.authorAlvaro Gomez
dc.contributor.authorYaritza Contreras Mendez
dc.date.accessioned2014-04-09T11:06:23Z
dc.date.available2014-04-09T11:06:23Z
dc.date.issued2009
dc.description.abstractThis paper proposes a fast, accurate, and quantitative method for alkylpyrazines determination in cocoa liquors samples using gas chromatography with ion trap mass spectrometry detection (GC/IT-MS) and on-line headspace (HS) sample introduction. The optimization of the experimental conditions of the headspace gas chromatography–mass spectrometry (HS–GC–MS) system was carried out using the univariate method, aiming to find a compromise between time of the analysis, sensitivity and pyrazine resolution in a Carbowax (AV-WAX) fused silica capillary column. The procedure was validated through accuracy and precision studies. The results showed a highly satisfactory accuracy rate for the method with a relative standard deviation (RSD) during 1 day and between days of <5.0% (n = 5). On the other hand, the recovery percentages (94–99%) were quantitative in all cases, with a RSD of <4.0% (n = 5). Finally, the use the on-line headspace extraction step simultaneously with the analytes separation and detection of the previous sample injection increased the analysis frequency to 3 samples/h. A total of 120 cocoa liquor samples were analyzed.en_US
dc.identifier.citationFood Chemistry 112 (2009) 253–257en_US
dc.identifier.urihttp://hdl.handle.net/123456789/339
dc.language.isoenen_US
dc.subjectGas chromatographyen_US
dc.subjectHeadspaceen_US
dc.subjectCocoaen_US
dc.subjectAlkylpyrazinesen_US
dc.subjectMass spectrometer detectionen_US
dc.subjectMaillard reaction productsen_US
dc.titleHeadspace gas chromatography–mass spectrometry determination of alkylpyrazines in cocoa liquor samplesen_US
dc.typeArticleen_US

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