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Mathematical Model for Pressurized Solvent Extraction from Leuzea carthamoides
Machalová, Zdeňka
This work concerns PSE from roots of Leuzea carthamoides and mathematical characterisation of this process. The PSE experiments were carried out at temperature 80°C, pressure 10 MPa and using methanol or ethanol as solvents. The extraction was semi-continuous with various solvent flow rate (0.5, 1, and 2 ml/min). Soxhlet extraction with methanol was used for comparison of methods. The concentration of 20-HE in extracts was determined by HPLC coupled with mass spectrometry. The basic mathematical model was applied to fit experimental data.
Plný tet: SKMBT_C22015061709340 -  PDF
Plný text: content.csg - PDF
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Comparison of Extraction Methods for Isolation of 20-Hydroxyecdysone from Leuzea carthamoides
Machalová, Zdeňka ; Sajfrtová, Marie ; Sovová, Helena ; Bártlová, Milena
This work is focused on the extraction of 20-HE from roots and seeds of Leuzea carthamoides using SFE, PLE and Soxhlet extraction. The SFE and PLE conditions (pressure, temperature, type and concentration of solvent, extraction time) were optimized to improve extraction yields and concentrations of 20-HE in extracts. These methods were compared with a conventional Soxhlet-type extraction. The SFE experiments were carried out at temperatures from 40°C to 60°C, pressures from 30 to 65 MPa and with addition of 5-20% of co-solvent (ethanol, methanol and acetone). PLE with ethanol, methanol and acetone was made at temperatures from 70°C to 100°C, pressures from 7 to 20 MPa and extraction time from 5-15 min. Soxhlet extraction with ethanol was used to evaluate the total content of 20-HE in roots and seeds. The concentration of 20-HE in extracts was determined by HPLC.
Plný tet: SKMBT_C22014082908303 - PDF
Plný text: content.csg - PDF
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