Sea buckthorn (Hippophae rhamnoides L.) is a minor fruit crop. The most important breeding activities focused on the production of sea buckthorn fruits as a top-quality food product have been performed in Russia, Germany, and the Czech Republic. Over the past several decades, plant breeders have selected a number of cultivars that show excellent physical and nutritional properties. The aim of this study was to monitor and determine the total contents of phenols and flavonoids as well as antioxidant capacity and scavenging activity of methanolic extracts on reactive oxygen species and lipid peroxidation in some cultivars of sea buckthorn suitable for growing in Central Europe. Altogether, 6 cultivars of this fruit species presented total phenolic contents ranging from 8.62 g of gallic acid kg -1 of fresh mass to 14.17 g of gallic acid kg -1 of fresh mass. There were high correlations between the contents of phenols and flavonoids on the one hand and the antioxidant properties of sea buckthorn berries on the other. This study indicates that for Central European conditions, sea buckthorn is a promising fruit species that can be used for consumption due to its antioxidant properties.
Forty rabbits weaned at 35 d of age were randomly assigned to 4 groups of 10 rabbits each. The rabbits were fed a basal granulated diet containing 0.08 mg Se/kg, or diets obtained from basal diet, supplemented with sodium selenite, selenized yeast (Se-yeast) or selenized algae Chlorella (Se-algae) to increase the Se concentration to 0.40 mg/kg. After 6 weeks rabbits were slaughtered at 77 d of age. Samples of meat, liver and hair were analyzed. The Se supplements did not infl uence rabbit growth, feed intake and weight loss during cooling. The nutrient composition of meat (dry matter, protein and fat concentration) was only marginally infl uenced. The Se concentration in the loin and hindleg meat increased by 23.0% and 19.2%, respectively in rabbits receiving the selenite supplement. In rabbits fed Se-yeast and Se-algae, the Se content in meat doubled from 0.11-0.15 mg/kg to 0.24-0.29 mg/kg. High Se concentrations (=1 mg/kg) were observed in hair and liver of rabbits which had received the Se-supplements. In all supplemented groups, the activity of glutathione peroxidase in the loin meat was higher than in control rabbits by 51.9-72.8% (P<0.001). The oxidative stability of rabbit meat, however, was not infl uenced. It follows from our results that (i) the enrichment of meat with Se is the main benefi t of supranutritional Se supply in rabbits, and (ii) Se-yeast and Se-algae are more effective in increasing Se content in tissues than selenite.
Isomers. -Reaction of 3-aminoquinolinediones with isocyanates (II) affords novel ureidoquinolinediones and/or imidazoquinolinediones depending on the substitution pattern in the starting amines. -(KLASEK*, A.; LYCKA, A.; HOLCAPEK, M.; HOZA, I.; J.
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