This study was undertaken within the frame of an ongoing project directed at fortifying rainbow trout fillets with selected beneficial n-3 polyunsaturated fatty acids (PUFA), namely alpha-linolenic acid (LNA, C18:3 n-3), eicosapentaenoic acid (EPA, C20:5 n-3) and docosahexaenoic acid (DHA, C22:6 n-3). Triplicate groups of rainbow trout (Oncorhynchus mykiss Walbaum) weighing 150-160 g were fed 3 diets at 26% lipid, 15% of which was as follows: D1, linseed oil; D2, EPAX 4510 TG (a glyceride containing min. 44% EPA and max. 15% DHA; Pronova Biocare, Lysaker, Norway); D3, EPAX 1050 TG (a glyceride containing max. 17% EPA and min. 50% DHA; ditto). Fish were sampled and analysed every 15 days for lipid content and fatty acid composition of the fillets, special attention being paid here to examine selected PUFA concentrations (as % fatty acid methyl esters) obtained within the first 60 days of the trial. At the 60th day, lipid content (g/100 g edible portion) did not differ significantly among diets (D1=8.18; D2=8.41; D3=7.74). D1 fillets had the highest concentration of LNA (D1=7.30 x; D2=3.32 y; D3=3.35 y), which increased by 58.35% compared with the start of the trial. EPA concentration was significantly higher in D2 fillets (D1=3.34 z; D2=5.88 x; D3=4.16 y), marking a 44.12% increase. D3 fillets were found to have a significantly higher DHA concentration (D1=13.93 y; D2=15.35 y; D3=17.81 x), the increase being more modest in this case (9.40%). As to the response in term of the most important n-6 PUFA concentrations in the fillets, a small but significant difference emerged among diets for linoleic acid (LA, C18:2 n-6; D1=14.79 x; D2=14.15 y; D3=14.40 xy), whereas no difference was observed for arachidonic acid (AA, C20:4 n-6, range 2.21-2.34). At the 60th day, n-6/n-3 did not differ among diets (D1=0.64; D2=0.60; D3=0.61), whereas significant differences emerged as to LNA/n-3 PUFA, LNA/EPA+DHA, EPA/DHA, LA/LNA, EPA/AA. These preliminary results indicate there is considerable scope for producing rainbow trout fillets to attain different n-3 PUFA levels and pertaining health-related ratios.

GATTA P.P., TESTI S., SILVI M., PAGLIUCA G., BONALDO A., ROEM A., et al. (2004). Tailoring the fatty acid composition of trout fillets for health purposes - Preliminary results.. HAMBURG : German Fed. Res. Centre for Nutrition and Food.

Tailoring the fatty acid composition of trout fillets for health purposes - Preliminary results.

GATTA, PIER PAOLO;TESTI, SILVIA;SILVI, MARINA;PAGLIUCA, GIAMPIERO;BONALDO, ALESSIO;BADIANI, ANNA
2004

Abstract

This study was undertaken within the frame of an ongoing project directed at fortifying rainbow trout fillets with selected beneficial n-3 polyunsaturated fatty acids (PUFA), namely alpha-linolenic acid (LNA, C18:3 n-3), eicosapentaenoic acid (EPA, C20:5 n-3) and docosahexaenoic acid (DHA, C22:6 n-3). Triplicate groups of rainbow trout (Oncorhynchus mykiss Walbaum) weighing 150-160 g were fed 3 diets at 26% lipid, 15% of which was as follows: D1, linseed oil; D2, EPAX 4510 TG (a glyceride containing min. 44% EPA and max. 15% DHA; Pronova Biocare, Lysaker, Norway); D3, EPAX 1050 TG (a glyceride containing max. 17% EPA and min. 50% DHA; ditto). Fish were sampled and analysed every 15 days for lipid content and fatty acid composition of the fillets, special attention being paid here to examine selected PUFA concentrations (as % fatty acid methyl esters) obtained within the first 60 days of the trial. At the 60th day, lipid content (g/100 g edible portion) did not differ significantly among diets (D1=8.18; D2=8.41; D3=7.74). D1 fillets had the highest concentration of LNA (D1=7.30 x; D2=3.32 y; D3=3.35 y), which increased by 58.35% compared with the start of the trial. EPA concentration was significantly higher in D2 fillets (D1=3.34 z; D2=5.88 x; D3=4.16 y), marking a 44.12% increase. D3 fillets were found to have a significantly higher DHA concentration (D1=13.93 y; D2=15.35 y; D3=17.81 x), the increase being more modest in this case (9.40%). As to the response in term of the most important n-6 PUFA concentrations in the fillets, a small but significant difference emerged among diets for linoleic acid (LA, C18:2 n-6; D1=14.79 x; D2=14.15 y; D3=14.40 xy), whereas no difference was observed for arachidonic acid (AA, C20:4 n-6, range 2.21-2.34). At the 60th day, n-6/n-3 did not differ among diets (D1=0.64; D2=0.60; D3=0.61), whereas significant differences emerged as to LNA/n-3 PUFA, LNA/EPA+DHA, EPA/DHA, LA/LNA, EPA/AA. These preliminary results indicate there is considerable scope for producing rainbow trout fillets to attain different n-3 PUFA levels and pertaining health-related ratios.
2004
Proceedings of the 34th Annual Plenary Meeting of the West European Fish Technologists Association (WEFTA)
64
68
GATTA P.P., TESTI S., SILVI M., PAGLIUCA G., BONALDO A., ROEM A., et al. (2004). Tailoring the fatty acid composition of trout fillets for health purposes - Preliminary results.. HAMBURG : German Fed. Res. Centre for Nutrition and Food.
GATTA P.P.; TESTI S.; SILVI M.; PAGLIUCA G.; BONALDO A.; ROEM A.; BADIANI A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/3733
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