Search results for "heart-cutting"

showing 3 items of 3 documents

Characterisation of the volatile fraction of aromatic caramel using heart-cutting multidimensional gas chromatography

2014

The first aim of our study was to improve characterisation of the volatile fraction of aromatic caramel by applying heart-cutting multidimensional gas chromatography coupled to mass spectrometry and olfactometry (MDGC-MS-O) on targeted odorant fractions. The second aim was to compare the volatile composition of two caramel samples, which differed in terms of their carbohydrate composition and cooking process. MDGC analyses enabled identification of 37 compounds (17 with the addition of pure standard) in the burnt sugar caramel, 20 of which were reported for the first time in caramel. Fifteen compounds were identified as odour-active and described using a range of attributes such as floral, …

Heart-cutting multidimensional gas chromatography (MDGC)Chromatography Gas[ SDV.AEN ] Life Sciences [q-bio]/Food and NutritionChimie analytiqueCarbohydratesFraction (chemistry)Food chemistryMass spectrometryMass SpectrometryCandyCaramel[CHIM.ANAL]Chemical Sciences/Analytical chemistryOlfactometryFood and NutritionFood scienceCarbohydrate compositionSugarAromaChromatographybiologyChemistryfood and beveragesGeneral Medicinebiology.organism_classificationOdorantsAlimentation et NutritionOdorant compoundsComposition (visual arts)[ CHIM.ANAL ] Chemical Sciences/Analytical chemistryGas chromatographyHeart-cutting multidimensional gas chromatography (MDGC);Olfactometry;Mass Spectrometry;Odorant compounds;CaramelAnalytical chemistry[SDV.AEN]Life Sciences [q-bio]/Food and NutritionFood Science
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Divdimensionālās šķidruma hromatogrāfijas augstas izšķirtspējas masspektrometrijas metodes izstrāde mikotoksīnu noteikšanai Puer tējās

2019

Maģistra darba ietvaros tika izstrādāta inovatīva divdimensionālās šķidruma hromatogrāfijas metode tandēmā ar augstas izšķirtspējas nolidojuma laika masspektrometriju (2D-LC-TOF-HRMS) 70 “jauno” un reglamentēto mikotoksīnu noteikšanai Puer tēju matricā. Šis uzdevums tika izvirzīts ar mērķi palielināt nosakāmo mikotoksīnu skaitu, uzlabot metodes selektivitāti un novērst traucējošo matricas komponentu efektu, pielietojot savienojumu atdalīšanu ar 2D-LC sistēmas palīdzību. Metode tika validēta saskaņā ar Eiropas Savienības analīzes metodes vadlīnijām. Izstrādātā online-heart-cutting-2D-HPLC-HRMS metode tika pielietota 20 Latvijā komerciāli pieejamajiem Puer tēju paraugiem, veicot analizēto mik…

HEART-CUTTING-2D-LCMIKOTOKSĪNITOFAUGSTAS IZŠĶIRTSPĒJAS MASSPEKTROMETRIJADIVDIMENSIONĀLĀ ŠĶIDRUMA HROMATOGRĀFIJAĶīmija
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The caramel flavour: impacts of the volatile and the non-volatile fraction on perception

2013

The aim of this thesis was to investigate the impact of the volatile odorant fraction and the non-volatile fraction on the perception of caramel flavour. The first step focused on the analytical characterization of the volatile odorant fraction of caramel using Gas Chromatography coupled to Olfactometry (GC/O), GC/Mass Spectrometry (GC/MS) and heart-cutting MDGC/MS/O. Results highlighted the presence of more than one hundred compounds and demonstrated the complexity of the caramel volatile fraction. The objective of the second step was to understand the contribution of odorant compounds identified to the caramel aroma typicality. Literature shows that odour intensity is not sufficient to ev…

caramelheart-cuttinginteractionsrecombinationflavoursensory analysisaddition testin-vitro aroma release[SDV.AEN] Life Sciences [q-bio]/Food and Nutritionaromagas-chromatographyomission testAnalyse sensoriellefactorial designodourarome[SDV.BBM] Life Sciences [q-bio]/Biochemistry Molecular Biologyflaveurodeur
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