Jabalpurwala, Fatima A.Rouseff, Russell Lee2021-12-082021-12-082010-05-01Jabalpurwala, F. vd. (2010). "Analysis of grapefruit sulphur volatiles using SPME and pulsed flame photometric detection". Food Chemistry, 120(1), 296-303.0308-81461873-7072https://doi.org/10.1016/j.foodchem.2009.09.079https://www.sciencedirect.com/science/article/pii/S030881460901139Xhttp://hdl.handle.net/11452/23088Sulphur volatiles are major factors in the perceived aroma of grapefruit juice, GFJ. The objective of this study was to develop a procedure to concentrate, separate, identify and quantify the major volatile sulphur compounds, VSC's, in grapefruit juices. SPME parameters such as headspace atmosphere, fibre coating, extraction time and temperature were evaluated. High resolution capillary CC using ZB-5, DB-Wax and PLOT columns coupled with pulsed flame photometric detection, PFPD, were employed for separation and detection. Thirteen sulphur volatiles were identified including; hydrogen sulphide, sulphur dioxide, methanethiol, dimethyl sulphide, carbon disulphide, dimethyl disulphide, 2-methyl thiophene, 3-methyl thiophene, methional, dimethyl trisulphide, 3-mercaptohexylacetate, 2,8-epithio-cis-p-menthane and 1-p-menthene-8-thiol. Five additional VSC's were tentatively identified. Canned reconstituted GFJ had more total sulphur volatiles and a greater number than fresh GFJ. Hydrogen sulphide comprised over 80% of total sulphur volatiles in fresh GFJ but only 5% in canned GFJ.eninfo:eu-repo/semantics/closedAccessPFPDSPMEGrapefruitVSCSolid-phase microextractionJuiceFreshQuantificationQuantitationOrangeWineChemistryFood science & technologyNutrition & dieteticsCitrus x paradisiArticle0002739311000422-s2.0-713490845662963031201Chemistry, appliedFood science & technologyNutrition & dieteticsLinalool; Myrcene; Sabinene1,4 menthene 8 thiol2 methylthiophene2,8 epithio 4 methane3 mercaptohexylacetate3 methylthiopheneAcetic acid derivativeCarbon disulfideDimethyl disulphideDimethyl sulfideDimethyl trisulphideHydrogenHydrogen sulfideMethaneMethanethiolMethionalNitrogenOxygenSulfurSulfur dioxideThiol derivativeThiophene derivativeUnclassified drugVolatile agentAirAromaArticleCapillary gas chromatographyChemical analysisControlled studyExtractionFlame photometryFood analysisFood compositionGrapefruit juiceSeparation techniqueSolid phase microextractionTemperature