Abstract
[Objective] The research aimed to compare the effects of different extraction methods on extracting the flavonoid substances from onion. [Method] Flavone was extracted from fresh onion and onionskin dry powder by using hot water leaching method, microwave-assisted freeze thawing method, ultrasonic wave method and ethanol solution leaching method. The content of total flavone was determined by ultraviolet spectrophotometry. [Result] Under the condition that the quercetin was confirmed as standard and the detection wavelength was 258 nm, it was accurate and feasible to determine the content of total flavone in onion by ultraviolet spectrophotometry and the average recovery rate reached 99.54 % with RSD of 1.2 %. Whether fresh onion or onionskin dry powder, the total flavone obtained by hot water leaching method was most, its content in the onionskin was 3.965 % (calculated by dry matter) and its content in fleshy parts was 0.376 % ( calculated by dry matter). The flavone content in the onionskin was obviously higher than that in fleshy bulb. The content of total flavone in the onionskin was 10 times as that in fresh fleshy onion. [Conclusion] Hot water leaching method is the appropriate method for extracting flavonoid substances from onion.
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Claims 6
Claim · model-written summary
UV spectrophotometry measured total onion flavone with 99.54% recovery.
- Taxon
- onion
Allium cepat0 - Outcome
- average recovery ratee0
- Value
- 99.54 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was accurate and feasible to determine the content of total flavone in onion by ultraviolet spectrophotometry and the average recovery rate reached 99.54 % with RSD of 1.2 %.”
t0“Onion”
Claim · model-written summary
Hot water leaching extracted the most total flavone from fresh onion and dry onion skin.
- Taxon
- onionAllium cepat0
- Treatment
- hot water leaching methode0
- Outcome
- total flavonee0
- Direction
- moste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whether fresh onion or onionskin dry powder, the total flavone obtained by hot water leaching method was most”
t0“Onion”
Claim · model-written summary
Onion skin contained 3.965% total flavone by dry matter.
- Taxon
- onionAllium cepat0
- Organ / stage
- onionskine0
- Outcome
- contente0
- Value
- 3.965 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its content in the onionskin was 3.965 % (calculated by dry matter)”
t0“Onion”
Claim · model-written summary
Fleshy onion parts contained 0.376% total flavone by dry matter.
- Taxon
- onionAllium cepat0
- Organ / stage
- fleshy partse0
- Outcome
- contente0
- Value
- 0.376 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its content in fleshy parts was 0.376 % ( calculated by dry matter).”
t0“Onion”
Claim · model-written summary
Onion skin total flavone content was ten times that of fresh fleshy onion.
- Taxon
- onionAllium cepat0
- Organ / stage
- onionskine0
- Outcome
- content of total flavonee0
- Value
- 10 timese0
- Comparator
- fresh fleshy onione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of total flavone in the onionskin was 10 times as that in fresh fleshy onion.”
t0“Onion”
Claim · model-written summary
The authors recommend hot water leaching for extracting onion flavonoids.
- Taxon
- onionAllium cepat0
- Treatment
- Hot water leaching methode0
- Outcome
- Hot water leaching methode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hot water leaching method is the appropriate method for extracting flavonoid substances from onion.”
t0“Onion”
The same questions in other papers
heat · molecular: metabolites · Allium cepa (onion)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.