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VCRB :: Contents of Volume 57/2002 :: Detailed information


METHOD OF QUERCETIN EXTRACTION FROM DRY SCALES OF ONION


Marcin HORBOWICZ
Research Institute of Vegetable Crops Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland


Summary

Dry outer scales of brown onion are one of the reachest known sources of free quercetin. In other plant 
tissues quercetin is present as glycosides only. Dry scales of onion are a waste during production and processing
of onion. A method of extraction of quercetin from powdered onion scales was elaborated. During research
effects of time, temperature and solvents used for extraction process were studied. It was found that 4-hours
extraction by shaking with cold ethyl acetate is effective, fast and simple method of isolation crude quercetin
from dry scales of onion. Obtained product is a powder of yellow colour, and its purity is equal 70%.
Hot extraction improved slightly yield of the process, but product purity was lower. Extraction with ethanol
containing various concentration of water caused that crude quercetin is oily and contains up to 78% of contaminants.
Such product needs further purification.


keywords:onion, dry scales, quercetin, extraction method

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