Development of Separating Techniques on Quercetin-Related Substances in Onion(Allium cepa L.) 2. Optimal Extracting Condition of quercertin-Related Substances in Onion

양파의 Quercetin 관련 물질의 분리 기술 개발 2. 양파의 Quercetin 물질의 최적 추출조건

  • Published : 1998.08.01

Abstract

To use onion(Allium cepa L.) residue as raw materials of food product, yields of onion-juice according to various extracting methods and optimal extracting condition of quercetin and its related glycosides were carried out. Onion juices gained by the methods of pressing, rotary crushing, freeze pressing and enzyme treatment. The yield by the method of enzyme treatment was higher than others. The yields of juice from fresh onion and heat-treated onion(8$0^{\circ}C$/10min) by pressing were 66% and 83%, respectively. Ethanol extraction of onion was efficient at 75$^{\circ}C$ and acetic acid extraction was proper at 3% concentration for 3 hours at 11$0^{\circ}C$. The onion extract was fractionated in the order of hexane, chloroform, ethylacetate and butanol to test flavonoids. The highest abundant flavonoids were found in ethylacetate and butanol fraction.

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References

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