SUMMARY
Fatty acids of the tuna of different fishing areas of the Mexican Pacific, canned in oil and water
A direct relationship exists between the state of health and the diet, and inside this some components, such as the fatty acids (FA). influence mostly in the prevention of certain illnesses (coronary heart disease, hypertension, rheumatoid arthritis, inflammatory answer, and arterial pressure). One of the main sources of essential FA are the marine products; the tuna is a marine food of wide consumption in Mexico due its readiness and low cost. The objective of this work was to determine the profile of fatty acids (FA) in tuna canned in oil and in water coming from three fishing areas of the Mexican Pacific. There were randomly obtained 7 oil-tuna commercial marks (AA) and 5 water- tuna (AW) coming from the next fishery areas: Baja California Sur (LI), Colima (L2) and Mazatlán (L3). The samples without draining were liquefied and thereafter it was obtained the methyl esters of fatty acids that were analyzed by gas chromatography with a flame ionization detector. In all the areas were identified 20 FA (mg/100g); three AGw 3 (EPA, DHA and linolenic) and two w 6 (linoleic and arachidonic). In the AA of the three areas the most abundant saturated FA were estearic and palmitic acids, the most abundant monounsaturated fatty acid was the cis-vaccenic, followed by the oleic acid. The behavior of those w 3 in the AA of the three areas were similar: with the less quantity was the linolenic acid (447-755), continued by the EPA (979-1323) and finally high concentrations of DHA (1862-3327). In the AW the DHA was the most abundant fatty acid in all the areas (1086- 4456), the most abundant monounsaturated fatty acid was the palmitic (640-3809). It was observed the presence of trans fatty acids in high quantities in AW: linolelaidic (1394-1495) and elaidic (377-1234). The relationship w 3/w 6 in the AA was similar in L1 and L2, and lower in L3; in AW was higher in L2 and L3. In conclusion, evident variation exists in the content of FA among afeas; it could be considered that the AA of L3 and A W of L2 as the richest in w 3 and w 6 FA. In general, the tuna in water is a richer food in FA w 3 and w 6 that the tuna in oil, independently of the fishery area.

Key words: Canned tuna, fatty acids, Mexican Pacific.



Recibido: 02/02/2000
Aceptado: 06/09/2001

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