Original title: Supercritical Fluid Extraction and Characterisation of Urtica Dioica L. Leaves Pigments
Authors: Sajfrtová, Marie ; Sovová, Helena ; Bártlová, Milena ; Opletal, L.
Document type: Papers
Conference/Event: International Congress of Chemical and Process Engineering CHISA 2002 /15./, Prague (CZ), 2002-08-25 / 2002-08-29
Year: 2002
Language: eng
Abstract: Extraction and fractionation of green and yellow pigments from stinging nettle leaves was studied using ethanol-modified carbon dioxide as a solvent. The extracts were analysed by means of HPLC and RP-HPLC systems. The effect of operation conditions was analysed in a series of experiments at pressures from 20 MPa to 28 MPa, temperatures between 25 °C and 60 °C, and ethanol concentration in CO2 between 0 and 7.4 wt.%. The main result was that the best conditions for the supercritical fluid extraction of pigments were ethanol concentration in CO2 4.5 - 7.4 wt.%, temperature 40°C and pressure 28MPa and that degradation of pigments was eliminated with decrease of temperature of micrometer valve and addition of small amount of antioxidant to ethanol.
Keywords: pigments; stinging nettle leaves; supercritical fluid extraction
Project no.: GA203/01/0550 (CEP)
Funding provider: GA ČR
Host item entry: Summaries, ISBN 80-86059-33-2

Institution: Institute of Chemical Process Fundamentals AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0063617

Permalink: http://www.nusl.cz/ntk/nusl-25174


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