title: Dynamic headspace gas chromatography/mass spectrometry characterization of volatiles produced in fish oil enriched mayonnaise during storage.
abstract: Protection against lipid oxidation and formation of unpleasant fishy and rancid off-flavors in oil-in-water food emulsions, such as fish oil enriched mayonnaise, is difficult to achieve. Volatile profiles from stored mayonnaises with different oil phase compositions were collected using a developed dynamic headspace sampling technique, in which interfering acetic acid was removed in situ with potassium hydroxide, and subsequently 148 volatiles were characterized and monitored by gas chromatography/mass spectrometry. Multivariate statistics showed correlation between the concentration of 62 volatiles and the fish oil and storage parameters, indicating the formation of lipid oxidation products, which impose fishy off-flavors. Further verification was obtained by gas chromatography/olfactometry, by which, among 78 odors, cis-4-heptenal and trans,cis-2,4-heptadienal were detected as distinct fishy notes. In total, 27 volatiles, including 1-penten-3-one, cis-2-penten-1-ol, cis-3-hexenal, cis-4-heptenal, 1-octen-3-one, 1,cis-5-octadien-3-one, 1-octen-3-ol, trans,cis-2, 4-heptadienal, and trans,cis-2,6-nonadienal, were suggested to contribute to the developed unpleasant fishy and rancid off-flavors.
authors.affiliation: Department of Biochemistry and Nutrition, Centre for Advanced Food Studies, Technical University of Denmark, Building 224, DK-2800 Lyngby, Denmark. karsten@mimer.be.dtu.dk
authors.forename: K
authors.initials: K
authors.lastname: Hartvigsen
authors.forename: P
authors.initials: P
authors.lastname: Lund
authors.forename: L F
authors.initials: LF
authors.lastname: Hansen
authors.forename: G
authors.initials: G
authors.lastname: Holmer
mesh_terms: D005395:Fish Oils / Q000032:analysis*; D005504:Food Analysis; D005519:Food Preservation; D008401:Gas Chromatography-Mass Spectrometry; D009812:Odorants / Q000032:analysis
chemical_list: D005395:Fish Oils