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Flavanone

About: Flavanone is a research topic. Over the lifetime, 1965 publications have been published within this topic receiving 54729 citations. The topic is also known as: flavanones.


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Journal ArticleDOI
TL;DR: All of the new flavanone glucosides persinosides A and B along with known flavonoids showed profound antioxidative activities by DPPH and cytochrome-c-reduction assays using the HL-60 cell culture system.
Abstract: A new flavanone Persinol (1) and the new flavanone glucosides persinosides A (2) and B (3) along with known flavonoids (4 and5) have been isolated from the ethyl acetate soluble fraction of the whole plants ofAerva persica. Their structures were elucidated on the basis of extensive analysis of nuclear magnetic resonance (1D & 2D-NMR) spectral data. All of them showed profound antioxidative activities by DPPH and cytochrome-c-reduction assays using the HL-60 cell culture system.

18 citations

Journal ArticleDOI
TL;DR: HPCE with UV detection was applied to the analyses of enzymatically glucosylated flavonoids, which are used as natural food additives in Japan, and found that flavanone glycosides needed higher pH values for good separation than flavonol glycoside.

17 citations

Journal ArticleDOI
TL;DR: Methanolic leaf extracts of Erythroxylum australe F. Muell produced eight O-conjugated flavonoids, which suggest kinship to E. ulei and linkage to the four cultivated alkaloid-bearing Erystroxylum, especially the ancestral E. cocavar.
Abstract: Methanolic leaf extracts of Erythroxylum australe F. Muell. produced eight O-conjugated flavonoids. Six of the flavonoid aglycones were dihydroisoflavones (all dihydro-orobol derivatives), one a flavanone, eriodictyol, and one a flavonol, quercetin. The major glycosides of the flavonoids included mono-glucosyl-rhamnosyls and dirhamnosyl-glucosides with either 3, 5, 7 or 3', 4' linkage or a combination thereof The array of flavonoids present in E. australe suggests kinship to E. ulei and linkage to the four cultivated alkaloid-bearing Erythroxylum, especially the ancestral E. coca var. coca. Because of the uniqueness of the flavonoids present in leaf tissue of E. australe they are unambiguously useful as chemotaxonomic markers for the taxon.

17 citations

Journal ArticleDOI
TL;DR: In this paper, the kinetic energy of photosensitized oxidation of the flavanone naringin and its chalcone isomer (4′-rhamnoglucosyl-2′,6′,4-trihydroxychalcone, CH) in neutral and 1mM NaOH ethanol solutions was studied using Rose Bengal as photosensitizer.
Abstract: The kinetic of the O 2 ( 1 Δ g )-photosensitized oxidation of the flavanone naringin (7-rhamnoglucosyl-4′,5-dihydroxyflavanone, FL) and its chalcone isomer (4′-rhamnoglucosyl-2′,6′,4-trihydroxychalcone, CH) in neutral and 1 mM NaOH ethanol solutions was studied using Rose Bengal as photosensitizer. The rate constants for the chemical quenching of O 2 ( 1 Δ g ) by the flavonoids ( k r ) were determined using either UV–vis absorption spectroscopy or HPLC techniques, and for the total (physical + chemical) quenching ( k t ) were determined using time-resolved phosphorescence detection of O 2 ( 1 Δ g ) at 1270 nm. A larger reactivity towards O 2 ( 1 Δ g ) of CH than for FL in neutral ethanol solutions was observed, due to the extra conjugated double bond in CH. However, in alkaline media the reactivity of both isomers was larger than in neutral conditions. This behavior was associated to the increment of electron density by the formation of a carbanion in FL and to the presence of the extended conjugated π-system in the CH isomer by deprotonation of phenolic groups. In all cases, the formation of 4-hydroxybenzoic acid as ending product was detected by HPLC. Based on reported mechanisms of O 2 ( 1 Δ g )-mediated oxidation of flavonoids, the formation of 7-rhamnoglucosyl-5,4′-dihydroxyflavonol as primary photo-oxidation product was proposed. The reactivity towards O 2 ( 1 Δ g ) of the aglycone of naringin (5,7,4′-trihydroxyflavanone or naringenin, NG) in alkaline conditions was lower than for the parent naringin, due to incapability of NG to form a carbanion species. These results are expected to have significance in biosynthesis, antioxidant properties and stability of naturally occurring flavonoids.

17 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202355
2022145
202165
202049
201944
201848