Abstract
The aglycone, or free quercetin, and total quercetin content of 75 cultivars and selections was analyzed by reverse-phase high-performance liquid chromatography. Quercetin glycosides were hydrolyzed into aglycones. Total quercetin content in yellow, pink, and red onions varied from 54 to 286 mg·kg -1 fresh weight in different onion entries grown during 1992. White onions contained trace amounts of total quercetin. Free quercetin content in all the onions was low (< 0.4 mg·kg -1 ) except in `20272-G' (12.5 mg·kg -1 fresh weight). Bulbs stored at 5, 24, and 30C and controlled atmosphere (CA) for 0,1,2,3,4, and 5 months showed a most marked change in total quercetin content at 24C compared to other treatments, with a rise in mid-storage followed by a drop. Storage at 5 and 30C also demonstrated a similar change. However, total quercetin content did not vary significantly in bulbs stored at CA for 5 months. We conclude that genetic and storage factors affect quercetin content on onions.
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Claims 7
Claim · model-written summary
Yellow, pink and red onion entries varied from 54 to 286 mg per kg in total quercetin.
- Taxon
- onions
Allium cepae0 - Material
- yellow, pink, and red onionse0
- Outcome
- Total quercetin contente0
- Value
- 54 to 286 mg·kg -1 fresh weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total quercetin content in yellow, pink, and red onions varied from 54 to 286 mg·kg -1 fresh weight in different onion entries grown during 1992.”
Claim · model-written summary
White onions contained trace total quercetin.
- Taxon
- onionsAllium cepae0
- Material
- White onionse0
- Outcome
- trace amounts of total quercetine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“White onions contained trace amounts of total quercetin.”
Claim · model-written summary
Free quercetin was below 0.4 mg per kg in all onions except one selection.
- Taxon
- onionsAllium cepae0
- Outcome
- Free quercetin contente0
- Direction
- lowe0
- Value
- < 0.4 mg·kg -1e0
- Qualifier
- except in `20272-G'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Free quercetin content in all the onions was low (< 0.4 mg·kg -1 ) except in `20272-G' (12.5 mg·kg -1 fresh weight).”
Claim · model-written summary
Selection 20272-G contained 12.5 mg per kg free quercetin.
- Taxon
- onionsAllium cepae0
- Material
- 20272-Ge0
- Outcome
- Free quercetin contente0
- Value
- 12.5 mg·kg -1 fresh weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Free quercetin content in all the onions was low (< 0.4 mg·kg -1 ) except in `20272-G' (12.5 mg·kg -1 fresh weight).”
Claim · model-written summary
At 24C, total quercetin rose during mid-storage and then dropped.
- Taxon
- onionsAllium cepat0
- Treatment
- 24Ce0
- Outcome
- total quercetin contente0
- Direction
- risee0
- Qualifier
- followed by a drope0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a most marked change in total quercetin content at 24C compared to other treatments, with a rise in mid-storage followed by a drop.”
t0“Onions”
Claim · model-written summary
Storage at 5 and 30C showed a similar change in total quercetin.
- Taxon
- OnionsAllium cepat0
- Treatment
- 5 and 30Ce0
- Outcome
- similar changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Storage at 5 and 30C also demonstrated a similar change.”
t0“Onions”
Claim · model-written summary
Total quercetin did not vary significantly under controlled atmosphere storage for five months.
- Taxon
- OnionsAllium cepat0
- Treatment
- CA for 5 monthse0
- Outcome
- total quercetin contente0
- Direction
- did not varye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total quercetin content did not vary significantly in bulbs stored at CA for 5 months.”
t0“Onions”
The same questions in other papers
storage · molecular: metabolites · Allium cepa (onion)Positive and negative results
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- positive
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See all 9 papers →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.