Flavonoid extraction from plants - using aq acetone evaporating and extracting a solution of flavonoids in saturated sodium chloride with butanol

Abstract

Abstract New method of extraction of plant flavonoids by extracting with aq. acetone at room temp., evaporating the acetone under reduced pressure, saturatin the aq. concentrate with NaCl, filtering off the pptated. condensed tannins, extracting the flavonoids with an immiscible organic solvent in which the flavonoids are not denatured, dehydrating the flavonoid solution and precipitating them by adding an organic solvent in which they are insol. and which mixes in all proportions with the flavonoid solvent collecting the ppte and drying it; in which the dehydrated flavonoid soln. is obtained by saturating the aq. soln. of flavonoids with NaCl, filtering, and extracting the filtrate with butanol, evaporating to dryness the butanol extract, under reduced pressure, extracting the residue with ethanol/ethyl acetate to give a dehydrated solution, then precipitating the flavonoids by adding to the soln. an anhydrous ether, esp. diethyl ether.

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