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- W2611757038 abstract "The extraction of pyrethrins from chrysanthemum flowers has been performed using supercritical CO2 (SC-CO2) extraction coupled to fractional separation, with the aim of producing complete and selective extraction of these insecticidal principles. 90 bar, 40 °C were selected as the operative conditions for a first step of extraction, to work at moderate SC-CO2 density; two separators in series operating at −10 °C and at a pressure equal to that of extraction, and 25 °C, 15 bar, were used for fractional separation, respectively. A second SC-extraction step, performed at 200 bar 40 °C, demonstrated that many undesired compounds were co-extracted at these process conditions. The comparison with liquid extraction, using petroleum ether, showed that using SC-CO2 and an exhaustive processing, 30% more pyrethrins were extracted. Using the fractional separation, the produced extracts contained about 99% w/w pyrethrins if the process was stopped after about 80 min. Another suggested duration of the extraction process can be set at about 250 min, at which about 63% w/w pyrethrins were contained in the extracted material. The adopted process strategy could be readily extended to the supercritical processing of several other materials and to the industrial scale." @default.
- W2611757038 created "2017-05-12" @default.
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- W2611757038 date "2017-07-01" @default.
- W2611757038 modified "2023-10-17" @default.
- W2611757038 title "Supercritical CO 2 processing strategies for pyrethrins selective extraction" @default.
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- W2611757038 doi "https://doi.org/10.1016/j.jcou.2017.04.012" @default.
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