Abstract
Effects of heat treatment and storage on quercetin and isorhamnetin content, major and minor components of isorhamnetin, and quercetin glucosides and aglycone, were investigated in onion (Allium cepa L.). The sweet onion 'Recorra' and red onions 'Hyred' and 'Red Baron' were cultivated in the south part of Norway and thereafter stored for eight months. The onions were either not field dried, but stored directly, or field dried and then stored, or field dried and then heat treated before storage. Neither storage nor heat treatment caused any major differences in total flavonol content in the investigated sweet onion as well as in the red onion cultivars. The two major quercetin glucosides differed in their changes in content during storage; quercetin-4'-glucoside did not show any consistent changes during storage in the two red cultivars, independent of treatment, whereas quercetin-3,4'-diglucoside increased significantly by 30 or 51%, respectively, during storage in 'Hyred' and 'Red Baron' in the 24 h heat treated onions. Isorhamnetin-4'-glucoside, which might possibly be of special interest from a human health point of view, was present at 2-3 times higher amount in the sweet onion cultivar than in the two red cultivars. Some of the quercetin glucosides present at lower concentrations, isorhamnetin-3,4'-diglucoside, quercetin-3,7,4'-triglucoside, and quercetin-7,4'-diglucoside, increased during storage in all treatments in both 'Hyred' and 'Red Baron', though sometimes a decrease was found at the end of storage.
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Claims 6
Claim · model-written summary
Storage and heat treatment caused no major total flavonol differences.
- Treatment
- storage nor heat treatmente0
- Outcome
- total flavonol contente0
- Direction
- any major differencese0
Not reportedTaxonComparator
Verbatim
e0“Neither storage nor heat treatment caused any major differences in total flavonol content”
Claim · model-written summary
Quercetin-4-glucoside showed no consistent storage change in red cultivars.
Not reportedTaxonComparator
Verbatim
e0“quercetin-4'-glucoside did not show any consistent changes during storage in the two red cultivars”
Claim · model-written summary
Quercetin diglucoside rose 30% in heat-treated Hyred.
- Taxon
- onions
Allium cepae0 - Material
- 'Hyred'e0
- Treatment
- 24 h heat treatede0
- Outcome
- quercetin-3,4'-diglucosidee0
- Direction
- increasede0
- Value
- 30e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quercetin-3,4'-diglucoside increased significantly by 30 or 51%, respectively, during storage in 'Hyred' and 'Red Baron' in the 24 h heat treated onions”
Claim · model-written summary
Quercetin diglucoside rose 51% in heat-treated Red Baron.
- Taxon
- onionsAllium cepae0
- Material
- 'Red Baron'e0
- Treatment
- 24 h heat treatede0
- Outcome
- quercetin-3,4'-diglucosidee0
- Direction
- increasede0
- Value
- 51%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quercetin-3,4'-diglucoside increased significantly by 30 or 51%, respectively, during storage in 'Hyred' and 'Red Baron' in the 24 h heat treated onions”
Claim · model-written summary
Sweet onion had 2-3 times more isorhamnetin glucoside than red cultivars.
- Taxon
- onionAllium cepae0
- Material
- sweet onion cultivare0
- Outcome
- Isorhamnetin-4'-glucosidee0
- Direction
- highere0
- Value
- 2-3 timese0
- Comparator
- two red cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isorhamnetin-4'-glucoside, which might possibly be of special interest from a human health point of view, was present at 2-3 times higher amount in the sweet onion cultivar than in the two red cultivars”
Claim · model-written summary
Several minor glucosides increased during storage in both red cultivars.
- Treatment
- storagee0
- Outcome
- isorhamnetin-3,4'-diglucoside, quercetin-3,7,4'-triglucoside, and quercetin-7,4'-diglucosidee0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“isorhamnetin-3,4'-diglucoside, quercetin-3,7,4'-triglucoside, and quercetin-7,4'-diglucoside, increased during storage in all treatments in both 'Hyred' and 'Red Baron'”
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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.