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- W2377803389 abstract "The effects of extraction variables, especially solvent type, microwave power, the microwave irradiation time, materials-solvent mass ratio, moisture content and particle size of materials on extraction efficiency were investigated using single factor test and orthogonal method. The optimum conditions are obtained: Petroleum ether as solvent, extracting twice, microwave power 450 W, irradiation time 120 s, solvent-material mass ratio 8∶1. The extracted solution was concentrated under vacuum to give crude essential oil which was dissolved in ethanol and frozen at -15 ℃ for 48 h. The solution was then separated centrifugally and filtered to get rid of impurities. The essential oil with yield of 3. 4 % and purity of 96.1 % was then obtained after distilling the liquor under vacuum." @default.
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- W2377803389 date "2007-01-01" @default.
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- W2377803389 title "Microwave-assisted extraction of essential oils from angelica sinensis" @default.
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