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• W33185309 abstract "Summary Polyphenols are one of the most numerous and widespread groups of compounds in the plant world. Nowadays, organic solvents such as methanol, ethanol, acetone, dimethylformamide, ethyl acetate and diethylether are mainly used for the extraction of polyphenols. These solvents require special process conditions and special care in the disposal of the used solvents. In this paper, the extraction of polyphenols from the model solution was performed using the aqueous two-phase system which contains 80–90 % water and represents low burden on the environment. The aqueous solution of gallic acid (GA) was used as a model solution of polyphenols. The extraction was performed in the aqueous two-phase system containing PEG6000/H2O/(NH4)2SO4 in a macroextractor (V=10 mL) and microextractor (V=14 µL). The influence of the process parameters, the concentration of gallic acid, pH and composition of the aqueous two-phase system was investigated in order to maximize the partition coefficient. The method of multifactor experimental planning was used to optimize the extraction process and the results were statistically analysed using the evolutionary operation method (EVOP). Optimal operating conditions of the extraction process were pH=6.50, aGA=4.50 g/L, the mass fraction of polyethylene glycol (PEG) wPEG=0.1037 g/g and the mass fraction of ammonium sulphate (AMS) wAMS=0.0925 g/g. Under these conditions the maximal partition coefficient of K=5.54 and the extraction efficiency of E=89.11 % were achieved and successfully applied for total phenol extraction from white wine in the macro- and microextractor. Approximately the same partition coefficients and extraction efficiency were achieved in the microextractor within a 60-fold shorter residence time." @default.
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• W33185309 date "2011-12-20" @default.
• W33185309 modified "2023-09-24" @default.
• W33185309 title "Aqueous Two-Phase Extraction of Polyphenols Using a Microchannel System - Process Optimization and Intensification" @default.
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