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
Effect of coupling conditions and content of magnesium ions on the amplitude and dark restoration of the slow phase (PS) of light-induced changes (CDL) in chloroplasts was studied. The amplitude of the PS-phase was increased after addition of electron acceptor and reached the maximum without exogenous ADP. A decrease of the PS-phase amplitude was induced by coupling and particularly by uncoupling conditions. The yield of delayed light after reduction of the electron acceptor was not equal to the initial one and was lower without ADP. CDL was restored almost completely in the presence of ADP and was not restored in the presence of CCCP after dark incubation. The PS-phase amplitude was decreased and dark restoration was increased after the addition of the magnesium ions. The changes of the amplitude and kinetics of the PS-phase under these conditions were not connected with the rate of electron transport. The results suggest that PS-decrease of CDL reflects the lowering of the electric potential of the thylakoids.