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Published 2002

Read in Norwegian

Publication details

Journal : European Journal of Lipid Science and Technology , vol. 104 , p. 520–529 , 2002

International Standard Numbers :
Printed : 1438-7697
Electronic : 1438-9312

Publication type : Academic article

Contributors : Kulås, Elin; Olsen, Elisabeth; Ackman, R. G.

Issue : 8

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Kjetil Aune
Chief Librarian


The relative ability of α-, γ- and δ-tocopherol (TOH) to influence the distribution of
volatile secondary oxidation products in fish oil was studied, with particular emphasis
on oxidation products expected to be important for adverse flavour formation. Purified
fish oil samples with 100 ppm or 1000 ppm of the different tocopherols were analysed
by dynamic headspace analysis of the volatiles formed after 2, 5 and 8 d of storage at
30 °C. The tocopherol type and concentration affected not only the overall formation of
volatile secondary oxidation products, but also the composition of this group of oxidation
products. Principal component analysis of the data obtained suggested that high
tocopherol hydrogen-donating power, i.e. a high tocopherol concentration or the use of
αTOH as opposed to γTOH or δTOH, directs the formation of hydrocarbons, unsaturated
carbonyl compounds of relatively high molecular weight, as well as the formation
of cis,trans isomers of unsaturated aldehydes. Although an active inhibitor of overall
volatile formation, αTOH at a high concentration thus appears to direct the formation
of the more flavour-potent aldehydes, such as those linking the carbonyl group with
ethylenic conjugated unsaturation.