Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Analysis of Echinacea content compounds
Michalíček, Jan ; Vespalcová, Milena (oponent) ; Zemanová, Jana (vedoucí práce)
Herbal plants belonging to the Echinacea genus are immunostimulants used especially for treatment of a common cold and upper respiratory tract infections. Seven Echinacea commercial products were analysed with high-performance liquid chromatography to quantitatively determine caffeic acid derivatives that are responsible for the plant healing properties. Determined contents of chlorogenic acid, caffeic acid, cichoric acid and echinacoside were compared between individual samples. Root and leaf-bloom extracts of Echinacea purpurea were prepared with pressurized solvent extraction under different conditions to show, which solvent system and temperarure is the most proper for extracting the highest amount of caffeic acid derivatives. From the measured data, Imunit Echinaceove kapky from Simply You was chosen as the product with the highest total concentation of the content compounds. Extraction at 80 °C using EtOH/water = 40/60 was found as the best way giving the highest concentration of caffeic acid derivatives from roots as well as leaves and blooms.

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