RESUMEN
Fatty acid (FA) and element contents were studied in 14 brands of canned (in its own juice and with sunflower oil) saury (Cololabis saira), a popular product of Russian market. Canned saury is a valuable source of essential polyunsaturated FA - eicosapentaenoic acid (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3). To obtain personal daily dose of EPA + DHA of 1 g for prevention of cardiovascular diseases, neural and inflammatory disorders one needs to intake from 26 to 76 g of canned saury, as was calculated for studied brands. ICP-OES analysis of 24 elements showed that Pb concentration in one brand and Cd content in most of studied saury samples exceeded standards for fish meat established by the European Commission. However, values of hazard quotient, HQEFA, which estimate benefit-risk ratio of fish intake, indicate that canned saury is safe product for human nutrition.
Asunto(s)
Ácidos Grasos Esenciales/administración & dosificación , Ácidos Grasos Esenciales/análisis , Peces/metabolismo , Metales Pesados/administración & dosificación , Metales Pesados/análisis , Medición de Riesgo/estadística & datos numéricos , Animales , Humanos , SeguridadRESUMEN
The effect of a biotic factor--the presence of predatory fish in water--on the composition and content of fatty acids in crustaceans was studied in the populations of the lake amphipod Gammarus lacustris from two lakes with fish and three lakes without fish. It was found that, at an overall increase in the quantity and quality of food resources (namely, increase in the content of eicosapentaenoic acid and docosahexaenoic acid (DHA) in the biomass), the relative rate of DHA accumulation in gammarids in the lakes without fish is higher than in the lake with fish.
Asunto(s)
Biodiversidad , Crustáceos/metabolismo , Ácidos Grasos/metabolismo , Lagos , Animales , Crustáceos/fisiología , Peces/fisiología , Conducta PredatoriaAsunto(s)
Ácidos Grasos Insaturados/química , Cadena Alimentaria , Ríos , Animales , Isótopos/químicaAsunto(s)
Americio/análisis , Biomasa , Bryopsida/crecimiento & desarrollo , Hydrocharitaceae/crecimiento & desarrollo , Americio/metabolismo , Bryopsida/química , Bryopsida/metabolismo , Carbohidratos/análisis , Membrana Celular/química , Pared Celular/química , Celulosa/análisis , Citoplasma/química , Cadena Alimentaria , Hydrocharitaceae/química , Hydrocharitaceae/metabolismo , Lípidos/análisis , Nitrógeno/análisis , Proteínas de Plantas/análisis , Polisacáridos/análisisRESUMEN
Seasonal dynamics of contents of essential polyunsaturated fatty acids (PUFA) in dominant groups of benthic invertebrates: gammarids (Gammaridae, Amphipoda), oligochaetes (Oligochaeta), chironomid larvae (Chironomidae, Diptera) and caddisfly larvae (Trichoptera), and dominant benthivorous fish, Siberian grayling Thymallus arcticus, have been studied in ecosystem of the large Siberian river. During the year of the study most benthic invertebrate taxa showed significant variations in the contents of both C-18 and long chain C-20-22 PUFAs. In contrast, the fish, which consumed the zoobenthos, had no significant seasonal variations in long chain PUFAs' contents. Thereby, the fish, as organisms of relatively higher evolution level than invertebrates, was supposed to have more strict metabolic control of long chain PUFAs' contents. Evidence was obtained that the studied fish species, grayling, may be capable to convert dietary EPA into DHA.
Asunto(s)
Ácidos Grasos Insaturados/análisis , Invertebrados/química , Salmonidae/metabolismo , Estaciones del Año , Animales , Cadena Alimentaria , Contenido Digestivo/química , Invertebrados/clasificación , Músculos/química , Ríos , Federación de RusiaRESUMEN
The composition and content of fatty acids (FAs) in total lipids, triacylglycerols (TAG) and polar lipids (PL) in dominant groups of benthic invertebrates: gammarids (Gammaridae, Amphipoda), chironomid larvae (Chironomidae, Diptera), caddisfly larvae (Trichoptera) and mayfly larvae (Ephemeroptera) were studied in the Yenisei river. For the first time data on the FA composition of species belonging to Trichoptera (Insecta) are presented. The groups of aquatic insect larvae and gammarids weakly differed in total content of essential polyunsaturated fatty acids (PUFAs). Hence, the strong invasion of gammarids which occurred in the last decades in the Yenisei river should not result in a decrease in potential yield of essential PUFA in the ecosystem and corresponding decrease in food resource quality for fish in respect to PUFA content. Significant differences in biomarker FAs in TAG were found which correlated to specific food sources. Different levels of long-chain PUFA in PL of the invertebrates are discussed in relation to the genetic ability of particular taxa to form these FAs.