Search claims · PlantClaims

Observationobservedoriginal resultmeasured

Claim · model-written summary

Quercetin levels exceeded kaempferol levels.

Taxon: cauliflowerBrassica oleracea var. botrytist0
Outcome: levels of quercetine0
Direction: highere0
Comparator: kaempferole0

Verbatim

e0
“the levels of quercetin were higher than those of kaempferol.”
✓ located verbatim in the source · abstract, characters 532–593

t0
“cauliflower”
✓ located verbatim in the source · title, characters 67–78

Title

The effects of plant density and irrigation on phenolic content in cauliflower

Alina Kałużewicz; Jolanta Lisiecka; Monika Gąsecka; et al. Horticultural Science 2017. doi:10.17221/60/2016-hortsci

Other claims from this paper (6)

Observation Phenolic acid levels ranged from 3.0 to 6.2 mg depending on density and irrigation.
Observation Flavonol levels ranged from 25.4 to 87.8 mg/100 g dry weight depending on density and irrigation.
Observation Caffeic acid had the highest amount among phenolic acids.
Association Phenolic acids except ferulic acid increased as plant density increased.
Association Both flavonols increased as plant density increased.
Intervention effect Irrigation significantly increased phenolic compounds except ferulic acid.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Quercetin levels remained unchanged under UV-B.

Outcome: quercetin levelse0
Direction: remained unchangede0

Not reportedTaxonTreatmentComparator

Verbatim

e0
“quercetin levels remained unchanged”
✓ located verbatim in the source · abstract, characters 1195–1230

Title

Ultraviolet B radiation improves salt-induced responses in the facultative halophyte Chenopodium quinoa

Guardigli, Giorgia; Alderotti, Francesca; Colzi, Ilaria; et al. Lancaster EPrints (Lancaster University) 2026

Other claims from this paper (8)

Intervention effect Salinity had minimal effect on quinoa growth.
Intervention effect Salinity reduced stomatal conductance by 36% to 47%.
Intervention effect Salinity reduced photochemical efficiency by 36% to 47%.
Intervention effect UV-B supplementation enhanced photosynthetic efficiency under salinity.
Intervention effect UV-B supplementation enhanced water relations under salinity.
Association Enhanced leaf water relations under combined treatment were associated with altered ion translocation and shoot compartmentalization.
Intervention effect UV-B decreased K+ accumulation in epidermal bladder cells.
Intervention effect UV-B shifted quinoa metabolism toward hydroxycinnamic acid production.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Quercetin levels were high in dried brown areas.

Taxon: OnionAllium cepat0
Organ / stage: dried brown arease0
Outcome: levels of quercetine0
Direction: highe0

Verbatim

e0
“levels of quercetin were high in dried brown areas”
✓ located verbatim in the source · abstract, characters 462–512

t0
“Onion Scales”
✓ located verbatim in the source · title, characters 153–165

Title

Deglucosidation of Quercetin Glucosides to the Aglycone and Formation of Antifungal Agents by Peroxidase-Dependent Oxidation of Quercetin on Browning of Onion Scales

Umeo Takahama; Sachiko Hirota Plant and Cell Physiology 2000. doi:10.1093/pcp/pcd025

Other claims from this paper (11)

Observation Brown outer scales contained 3,4-dihydroxybenzoic acid.
Observation Quercetin glucosides in dried brown areas were below 10% of levels in fleshy and drying areas.
Mechanism The authors infer quercetin formation by deglucosidation at the drying boundary.
Observation Peroxidase activity in dried brown areas was about 10% of activity in fleshy and drying areas.
Observation Quercetin underwent autooxidation.
Intervention effect Extracts and isolated peroxidase enhanced quercetin oxidation without externally added hydrogen peroxide.
Intervention effect Catalase suppressed enhancement of quercetin oxidation.
Observation No tyrosinase-like activity was detected in extracts or peroxidase preparation.
Mechanism Hydrogen peroxide formation during enhanced oxidation was inferred.
Observation Two quercetin oxidation products were found in dried brown scale.
Mechanism The authors infer peroxidase-dependent formation of antifungal benzoic acid.

Observationobservedoriginal resultsignificant (as stated)measured

Claim · model-written summary

Cultivar differences in quercetin levels were significant but inconsistent.

Taxon: Allium cepa L.Allium cepat0
Outcome: quercetin levelse3
Qualifier: inconsistente3

Verbatim

t0
“Yellow Onion (Allium cepa L.)”
✓ located verbatim in the source · title, characters 21–50

e3
“Cultivar differences in quercetin levels were significant but inconsistent”
✓ located verbatim in the source · abstract, characters 1108–1182

Title

Quercetin Content in Yellow Onion (Allium cepa L.) Effects of Cultivation Methods, Curing and Storage

Lars Mogren 2006

Other claims from this paper (12)

Association The amount of global solar radiation at the end of the bulbing phase in August was the main determinant of quercetin level.
Association Annual variations in quercetin content were higher than the effect of any treatment within each year.
Intervention effect Early lifting, when 50% of the onions had fallen leaves, gave onions with better keeping quality than later lifting.
Intervention effect Early lifting gave onions with quercetin content equal to that of later lifting.
Intervention effect Minimised split application of nitrogen fertilisers reduced the risk of mineral nutrient leaching.
Intervention effect Minimised split application of nitrogen fertilisers did not lower yield or quercetin content.
Intervention effect Field curing gave significant increases in quercetin content compared with levels at lifting.
Observation The role of onion size for quercetin content was inconsistent and of minor importance.
Observation Quercetin levels were stable during cold storage at constant temperature.
Intervention effect No significant difference in quercetin content was found between organically and inorganically fertilised onions of the same cultivar.
Intervention effect No significant difference in quercetin content was found between directly sown and transplanted onions.
Association Quercetin content was not correlated with soil water content within the field.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Quercetin levels varied widely among Welsh onion cultivars.

Taxon: Welsh onion (Allium fistulosum L.)Allium fistulosumt0
Outcome: quercetin levelse0
Direction: Large variationse0

Verbatim

e0
“Large variations in quercetin levels were observed among cultivars.”
✓ located verbatim in the source · abstract, characters 511–578

t0
“Welsh onion (Allium fistulosum L.)”
✓ located verbatim in the source · title, characters 55–89

Title

Variation of quercetin content in different tissues of Welsh onion (Allium fistulosum L.)

Xihuan Feng African Journal of Agricultural Research 2011. doi:10.5897/ajar10.1141

Other claims from this paper (5)

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Elicitation elevated amaranth sprout quercetin, kaempferol, and betaxanthin levels.

Taxon: amaranthAmaranthus caudatust0
Treatment: Elicitatione0
Outcome: quercetin, kaempferol, and betaxanthin levelse0
Direction: elevatede0

Not reportedComparator

Verbatim

e0
“Elicitation elevated quercetin, kaempferol, and betaxanthin levels.”
✓ located verbatim in the source · abstract, characters 1260–1327

t0
“amaranth sprouts”
✓ located verbatim in the source · title, characters 34–50

Title

Boosting antioxidant potential in amaranth sprouts: Assessing salicylic acid and hydrogen peroxide treatments

Viridiana Pérez-Pérez; Cristian Jiménez-Martínez; Alejandra Linares-Castañeda; et al. Applied Food Research 2026. doi:10.1016/j.afres.2026.102017

Other claims from this paper (7)

Observation Germination significantly increased amaranth sprout phenolics and betalains.
Intervention effect Salicylic acid at 5.5 ppm enhanced amaranth sprout phenolics and flavonoids.
Intervention effect Hydrogen peroxide at 340 ppm enhanced amaranth sprout phenolics and flavonoids.
Observation Longer germination at 120 h maximized amaranth sprout betalains.
Observation Amaranth sprout antioxidant activity increased by up to 3.69-fold relative to raw amaranth.
Intervention effect Elicitors altered amaranth sprout betalain profiles.
Intervention effect Elicitors improved amaranth sprout color by ΔE > 5.0.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Quercetin, rutin and quercetin-4 glucoside levels declined during the first two weeks of cold storage.

Taxon: table grapest0
Treatment: cold storagee0
Outcome: quercetin, rutin and quercetin-4 glucoside levelse0
Direction: declinede0
Qualifier: first two weekse0

Not reportedComparator

Verbatim

t0
“table grapes of cv. Vittoria”
✓ located verbatim in the source · title, characters 83–111

e0
“The quercetin, rutin and quercetin-4 glucoside levels declined during the first two weeks of cold storage”
✓ located verbatim in the source · abstract, characters 1561–1666

Title

The effect of cold storage on the phenolic composition and antioxidant capacity of table grapes of cv. Vittoria

Danijela Skroza; Hrvoje Šimičić; Ivana Generalić Mekinić; et al. 2011

Other claims from this paper (11)

Observation Fresh grape skin extracts were rich in phenolics.
Observation Fresh grape skin extracts had good antioxidant capacity by FRAP and DPPH.
Observation Mean total phenols in fresh grape skin extracts were 883±19 mg GAE/L.
Observation Quercetin, kaempferol and rutin were present in all grape skin extracts.
Observation Trans-resveratrol was present in all grape skin extracts.
Observation Quercetin-4-glucoside was the dominant flavonoid compound.
Intervention effect Total phenol content showed no obvious change during cold storage.
Intervention effect FRAP showed no obvious change during cold storage.
Intervention effect Resveratrol levels remained constant and did not differ from fresh grapes during cold storage.
Intervention effect DPPH radical scavenging efficiency decreased during cold storage.
Mechanism The decrease in flavonols could explain the change in DPPH scavenging efficiency.

Intervention effectobservedoriginal resultsignificant (as stated)measured

Claim · model-written summary

Pruning significantly affected rutin, quercetin malonyl-hexoside, and quercetin-3-glucoside levels.

Taxon: Morus alba L.Morus albat0
Treatment: pruninge0
Outcome: levels of rutin, quercetin malonyl-hexoside, and quercetin-3-glucoside contentse0

Not reportedComparatorDirection

Verbatim

e0
“a significant effect of pruning on total phenolics as well as on the levels of rutin, quercetin malonyl-hexoside, and quercetin-3-glucoside contents”
✓ located verbatim in the source · abstract, characters 1621–1769

t0
“Morus alba L.”
✓ located verbatim in the source · title, characters 62–75

Title

Morphometric and biochemical screening of old mulberry trees (Morus alba L.) in the former sericulture region of Slovenia

Andreja Urbanek Krajnc; Tina Ugulin; Andrej Paušič; et al. Acta Societatis Botanicorum Poloniae 2019. doi:10.5586/asbp.3614

Other claims from this paper (9)

Observation Leaf morphometrics distinguished two morphotype groups.
Observation Annual base cutting is traditional in Goriška.
Association Frequently pruned trees form larger leaves.
Observation Mulberry leaves were rich in proteins and prominent free amino acids.
Observation Several phenolics were identified as main compounds.
Association Metabolite concentrations correlated with pruning or morphotype.
Intervention effect Pruning raised asparagine, alanine, and serine in annually pruned trees.
Intervention effect Pruning significantly affected total phenolics.
Observation Multivariate analysis identified seven chemotypes.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Quercetin dominated the chloroform fraction at exceptionally high levels.

Material: chloroform fractione0
Outcome: quercetine0
Direction: dominatinge0

Not reportedTaxon

Verbatim

e0
“quercetin dominating the chloroform fraction at exceptionally high levels”
✓ located verbatim in the source · abstract, characters 445–518

Title

Electrochemical and spectrophotometric assessment of antioxidant properties in Asphodelus tenuifolius Cav. extracts

Imane Guediri; Meriem Henni; Aicha Adaika; et al. Free Radical Research 2025. doi:10.1080/10715762.2025.2610955

Other claims from this paper (6)

Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

Quercetin levels were stable during cold storage at constant temperature.

Taxon: Allium cepa L.Allium cepat0
Treatment: cold storage at constant temperaturee1
Outcome: Quercetin levelse1

Verbatim

t0
“Yellow Onion (Allium cepa L.)”
✓ located verbatim in the source · title, characters 21–50

e1
“Quercetin levels were stable during cold storage at constant temperature”
✓ located verbatim in the source · abstract, characters 1708–1780

Title

Quercetin Content in Yellow Onion (Allium cepa L.) Effects of Cultivation Methods, Curing and Storage

Lars Mogren 2006

Other claims from this paper (12)

Association The amount of global solar radiation at the end of the bulbing phase in August was the main determinant of quercetin level.
Association Annual variations in quercetin content were higher than the effect of any treatment within each year.
Observation Cultivar differences in quercetin levels were significant but inconsistent.
Intervention effect Early lifting, when 50% of the onions had fallen leaves, gave onions with better keeping quality than later lifting.
Intervention effect Early lifting gave onions with quercetin content equal to that of later lifting.
Intervention effect Minimised split application of nitrogen fertilisers reduced the risk of mineral nutrient leaching.
Intervention effect Minimised split application of nitrogen fertilisers did not lower yield or quercetin content.
Intervention effect Field curing gave significant increases in quercetin content compared with levels at lifting.
Observation The role of onion size for quercetin content was inconsistent and of minor importance.
Intervention effect No significant difference in quercetin content was found between organically and inorganically fertilised onions of the same cultivar.
Intervention effect No significant difference in quercetin content was found between directly sown and transplanted onions.
Association Quercetin content was not correlated with soil water content within the field.

“quercetin levels”

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