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Title

13C nuclear magnetic resonance monitoring of free fatty acid release after fish thermal processing

AuthorsMedina, Isabel ; Sacchi, Raffaele; Aubourg, Santiago P.
KeywordsTuna
DHA
Free fatty acids
Hydrolysis
13C NMR
Raw
Thunnus alalunga lipids
Issue Date1994
PublisherSpringer
CitationJournal of the American Oil Chemists’ Society 71(5): 479-482 (1994)
Abstract13C Nuclear magnetic resonance spectroscopy was applied to the study of lipid hydrolysis occurring during industrial canning of tuna (Thunnus alalunga). An increase in the free fatty acid (FFA) level was observed after cooking and sterilization, and a different FFA pattern was found when storage of the frozen raw material and thermal steps (cooking and can sterilization) were compared. Lipolysis in raw muscle occurs preferentially in thesn-1 andsn-3 acyl positions of triacylglycerols, with a consequent cleavage of saturated and monounsaturated fatty acids. After thermal processing, an increase of docosahexaenoic acid (DHA) was found in the FFA fraction, as well as a relative decrease of the peak intensity of DHA in thesn-2 position of triacylglycerols. This finding indicates a different mechanism of FFA release during the frozen storage and thermal processing of raw fish.
Description4 páginas, 1 tabla, 2 figuras
Publisher version (URL)http://dx.doi.org/10.1007/BF02540657
URIhttp://hdl.handle.net/10261/60097
DOI10.1007/BF02540657
ISSN0003-021X
E-ISSN1558-9331
Appears in Collections:(IIM) Artículos
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