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EN
Dietary fibres (DF) have been isolated from rapeseed and peas, separated into different fractions and investigated for their content of associated non-carbohydrate compounds, especially proteins by UV-spectroscopy, nitrogen determination, isoelectric focusing, and rocket Immunoelectrophoresis. The level of protein varied according to the plant origin of DF and among the different DF fractions (pectins, hemicelluloses, cellulose, lignins). In general, rapeseed DF contained more protein than pea DF, with the hemicellulose fraction from rapeseed hulls having the highest level. Rocket immunoelectrophoresis proved the presence of myrosinase as part of the DF associated proteins in rapeseed. This may be of importance for the degradation of glucosinolates in the digestive tract of humans and animals, and thereby the effects from these compounds are changed.
2
Content available remote Przekształtnik energii fal oceanicznych - Wave Dragon MW
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PL
Artykuł prezentuje podstawowe informacje na temat przekształtnika energii fal morskich Wave Dragon MW oraz problemy związane z wyborem systemu odbioru i przesyłu energii do linii zasilającej. Omówiono niektóre z możliwości rozwiązań systemu prądnica – energoelektroniczny przekształtnik sieciowy, a także przedstawiono wstępne wyniki badań symulacyjnych (w pakiecie symulacyjnym SABER i Matlab) i eksperymentalnych z generatorami indukcyjnym i synchronicznym o magnesach trwałych oraz przekształtnikiem AC/DC/AC dwu i trzy poziomowym.
EN
The paper has as an objective to combine and disseminate information on generators and power electronics solutions for Wave Dragon MW Power Take Off system. Wave Dragon MW captures power from the sea waves by means of low-head turbines and converts it to rotating mechanical power. In recent years because of energetic problem on almost whole world power electronics and electric machines as well as renewable energy market has been intensively developed. Problems which can appear in mechanical power to electrical power conversion in Wave Dragon MW can be expected to be similar as in wind turbine. However, subject of the mechanical energy conversion from sea waves to electrical energy is not well identified and further research should be curried out.
EN
Supercritical fluid chromatographic (SFC) separations of a-tocopheryl acetate, α-, ß-, y- and -tocopherol have been achieved on a Spherisorb S3 ODS2 column in about 15 minutes. Separation efficiency of this method has been optimised with respect to the effect of pressure, percent of methanol in the mobile phase, temperature and flow rate, resulting in theoretical plate numbers (N) varying from 63000 to 90000 per metre. Linear correlations have been found between log k' (retention factor) and fluid density for all of the tested compounds, and a van't Hoff plot yielded linear correlation between log k' and T-1 at constant mobile phase density. Linearity and repeatability were found to be acceptable with detection limits from approximately 20 ng for α-, ß-, y- and ő-tocopherol to 10 ng for a-tocopheryl acetate at a signal to noise ratio = 3. Results obtained by use of the developed SFC method to determination of tocopherols in plant oils obtained by SFE (supercritical fluid extraction) and by aqueous enzymatic processing are presented.
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