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Oxidation in fish lipids during thermal stress as studied by 13 C nuclear magnetic resonance spectroscopy
Author(s) -
Medina Isabel,
Sacchi Raffaele,
Giudicianni Italo,
Aubourg Santiago
Publication year - 1998
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-998-0026-7
Subject(s) - moiety , chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , allylic rearrangement , resonance (particle physics) , fish <actinopterygii> , glycerol , carbon fibers , nuclear magnetic resonance , photochemistry , stereochemistry , organic chemistry , materials science , physics , particle physics , quantum mechanics , fishery , composite number , composite material , biology , catalysis
13 C Nuclear magnetic resonance spectroscopy has been applied to elucidate the mechanism of lipid oxidation occurring during thermal treatment of fish. Effects of temperature and time of processing have been studied by means of a model system of lipids, extracted from salmon ( Salmo salar ) muscle, to simulate industrial conditions of canning. Unsaturated fatty acids located at the sn ‐2 position of the glycerol moiety were the most prone to oxidative damage. Regarding the mechanism of the reaction, results inferred from olefinic and methylenic resonances indicated a higher susceptibility of the allylic sites closest to the carbonyl group, followed by those placed near the methyl terminal group. Unsaturations located in the middle of the carbon chain did not show much damage. The glyceryl region provided an unusual resonance at 53.4 ppm, which could be assigned to a hydroxylic compound formed during process.