title: Effect of SPME extraction conditions and humidity on the release of volatile lipid oxidation products from spray-dried emulsions.
abstract: The aim of the study was to investigate the effects of headspace solid-phase microextraction (HS-SPME) conditions and relative humidity (RH) on the release of volatile lipid oxidation products from spray-dried emulsions. Two model spray-dried sunflower oil emulsions with a Na-caseinate-maltodextrin matrix were oxidised, stabilised at five RHs and analysed by HS-SPME-GC-MS for volatiles. Increased extraction temperature raised not only the overall release of volatile compounds but also altered the volatile profile. The obtained volatile profiles were dependent on the RH. This was mainly due to the humidity response of the matrix affecting e.g. its binding ability and hydrophilicity. Cross-linking of the emulsifying protein had a minor influence on the release. Both matrix-related factors and extraction conditions should thus be taken into account in interpretation of the HS-SPME results. On the other hand, being sensitive to changes in matrix composition and structure, the HS-SPME allows studying of matrix-related changes in foods.
authors.affiliation: Department of Food and Environmental Sciences, University of Helsinki, P.O. Box 27, 00014 University of Helsinki, Finland. Electronic address: annelie.damerau@helsinki.fi.
authors.forename: Annelie
authors.initials: A
authors.lastname: Damerau
authors.affiliation: Department of Food and Environmental Sciences, University of Helsinki, P.O. Box 27, 00014 University of Helsinki, Finland.
authors.forename: Pimwalee
authors.initials: P
authors.lastname: Kamlang-ek
authors.affiliation: VTT Technical Research Centre of Finland, P.O. Box 1000, 02044 VTT, Finland.
authors.forename: Timo
authors.initials: T
authors.lastname: Moisio
authors.affiliation: Department of Food and Environmental Sciences, University of Helsinki, P.O. Box 27, 00014 University of Helsinki, Finland.
authors.forename: Anna-Maija
authors.initials: AM
authors.lastname: Lampi
authors.affiliation: Department of Food and Environmental Sciences, University of Helsinki, P.O. Box 27, 00014 University of Helsinki, Finland.
authors.forename: Vieno
authors.initials: V
authors.lastname: Piironen
mesh_terms: D002364:Caseins / Q000737:chemistry*; D004655:Emulsions / Q000737:chemistry*; D006813:Humidity; D010084:Oxidation-Reduction; D010938:Plant Oils / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000379:methods*; D000074242:Sunflower Oil
chemical_list: D002364:Caseins; D004655:Emulsions; D010938:Plant Oils; D000074242:Sunflower Oil
keywords: HS-SPME–GC–MS; PCA; Release of volatile compounds; Spray-dried emulsions; Sunflower oil