Showing papers on "Acacetin published in 2001"
TL;DR: Fractionation of a methanolic extract of the leaves of Anthurium versicolor has resulted in the isolation and characterization of four new flavone glycosides, including vitexin (apigenin-8-C-beta-D-glucopyranoside) and rosmarinic acid.
Abstract: Fractionation of a methanolic extract of the leaves of Anthurium versicolor has resulted in the isolation of two main fractions, I and II. Both the extract and the fractions were assayed for their radical-scavenging activity by means of an in vitro test (bleaching of the stable 1,1-diphenyl-2-picrylhydrazyl radical) and showed a significant radical-scavenging effect. Subsequent chromatographic fractionation of the most active fraction, II, has led to the isolation and characterization, as major constituents, of four new flavone glycosides, acacetin 6-C-[α-l-rhamnopyranosyl-(1→3)-β-d-glucopyranoside] (1), acacetin 6-C-[β-d-xylopyranosyl-(1→6)-β-d-glucopyranoside] (2), acacetin 6-C-[β-d-apiofuranosyl-(1→3)-β-d-glucopyranoside] (3), and acacetin 8-C-[α-l-rhamnopyranosyl-(1→3)-β-d-glucopyranoside] (4), as well as vitexin (apigenin-8-C-β-d-glucopyranoside) and rosmarinic acid. The structures of 1−4 were determined using spectroscopic methods.
163 citations
TL;DR: In this paper, the authors reported that the locked conformation of OH and OCH3 groups in solids results in an increased shielding of carbon adjacent to C-OH or C-OCH3 hydrogens, enabling conclusions as to the orientations of these groups to be drawn.
Abstract: 13C CP/MAS NMR spectra were recorded to characterize the solid-state conformation of flavonoids: galangin, kaempferol, quercetin, myricetin, chrysin, apigenin, luteolin, acacetin, hesperetin and naringenin. Correct assignment of the signals in solution-state spectra (using APT, HSQC and HMBC) and solid-state spectra (using dipolar dephased and short contact sequences) for the above flavonoids is reported. The locked conformation of OH and OCH3 groups in solids results in an increased shielding of carbon adjacent to C—OH or C—OCH3 hydrogens, enabling conclusions as to the orientations of these groups to be drawn. The C-5—OH hydroxyl (and C-3—OH) points towards the carbonyl group oxygen, forming intramolecular hydrogen bonds. Considerations of C2′ and C6′ carbon shielding suggest that ring B is not coplanar with the benzopyran fragment in kaempferol, acacetin and myricetin. Copyright © 2001 John Wiley & Sons, Ltd.
103 citations
TL;DR: The new 3-desoxyanthocyanidins 6,7,3'-trihydroxy-5,4'-dimethoxy-flavylium and 6, 7,3',4'-tetrahydroxy- 5-methoxy -flavolium and the known Carajurin were isolated by bioguided fractionation from the leaves of Arrabidaea chica, with transcription factor NF-kappaB as target.
79 citations
TL;DR: A new acetylated flavone glycoside has been isolated from the leaves of Calamintha glandulosa together with the known compound acacetin 7-O-rhamnosyl(1"'-->6")glucoside, and their occurrence in the closely related genera Satureja, Micromeria, Acinos and Clinopodium indicates that their distribution may be of taxonomic significance.
51 citations
TL;DR: Pinocembrin, acacetin, galanguin, izalpin, kaempferide, prenyletin and diarytheptane were isolated from propolis from Central Chile.
Abstract: Pinocembrin, acacetin, galanguin, izalpin, kaempferide, prenyletin and diarytheptane were isolated from propolis from Central Chile.
27 citations
TL;DR: The data confirm the conclusion of other studies, including rbcL and atpB gene sequence analysis, that Biebersteinia is completely unrelated to the Geraniaceae, where it was once placed.
26 citations
Journal Article•
TL;DR: Linarin and acacetin were isolated from Yinqiaosan Powder for the first time and identified as linarin and hyperoside respectively.
Abstract: Objective To study the chemical constituents in Yinqiaosan Powder that have antiviral action on influenza Method Isolation of the constituents by different kinds of column chromatography and elucidation of their structures by chemical and spectral methods Results Seven flavonoids were obtained, and six of them were identified as linarin, acacetin, hesperidin, isoquiritigenin, isoquiritin and hyperoside respectively Conclusion Linarin and acacetin were isolated from Yinqiaosan Powder for the first time
12 citations
Journal Article•
TL;DR: Four compounds were identified as tilianin, agastachoside, acacetin and oleanolic acid, which were isolated from the whole plant of Dracocephalum moldavica for the first time.
Abstract: Objective To study the chemical constituents from the whole plant of Dracocephalum moldavica. Method The compounds were isolated using RA polystyrene resin and silica gel column chromatography, and the structures were elucidated by means of spectral method. Result Four compounds were identified as tilianin, agastachoside, acacetin and oleanolic acid. Conclusion All the compounds were isolated from this plant for the first time.
11 citations
Journal Article•
TL;DR: In this article, seven compounds were isolated from the aerial parts of Eupatorium odoratum Linn. by means of spectral methods, their structures were respectively elucidated as four flavonoids and β sitosterol, stigmasterol, β daucosterol.
Abstract: Seven compounds were isolated from the aerial parts of Eupatorium odoratum Linn.By means of spectral methods,their structures were respectively elucidated as four flavonoids kaempferol 4 methyl ether,quercetin 7,4 dimethyl ether,acacetin,naringenin 4 methyl ether and β sitosterol,stigmasterol,β daucosterol.
3 citations
Journal Article•
TL;DR: In this paper, the amount of acacetin 7 O β D glucoside and apigenin 7 o β D glucose in Chrysanthemum morifolium Ramat from different localities was determined using HPLC results.
Abstract: Object To determine the amount of acacetin 7 O β D glucoside and apigenin 7 O β D glucoside in Chrysanthemum morifolium Ramat from different localities Methods By the use of HPLC Results The contents of acacetin 7 O β D glucoside in Boju 1, Chuju 2, Gongju 3 and Hangju 4 were 0 082 6% ～0 124 9%, 0 015 7% and 0 033 5% respectively; the contents of apigenin 7 O β D glucoside in Chuju, Boju, Gongju and Hangju were 0 012 6%, 0 027 4%, 0 117 7% and 0 587 7% respectively Conclusion The contents of the two flavone glycoside in C morifolium from different localities were markedly different
2 citations