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1. (Article ID: 12262)
 
Kang SS, Chang YS, Kim JS
Two new acylated flavonol glycosides from Vicia amurensis
Chemical and Pharmaceutical Bulletin 48(8) (2000) 1242-1245
 

Two new acylated flavonol glycosides, named amurenosides A and B, together with quercetin 3-(2, 6-di-O-α-rhamnopyranosyl-β-galactopyranoside), have been isolated from the whole plant of Vicia amurensis. Their structures were elucidated as quercetin 3-O-α-L-(3-feruloylrhamnopyranosyl)(1→6)-[α-L-rhamnopyranosyl(1→2)]-β-D-galactopyranoside and quercetin 3-O-α-L-(2-feruloylrhamnopyranosyl)(1→6)-[α-L-rhamnopyranosyl(1→2)]-β-D-galactopyranoside on the basis of various NMR techniques, FAB mass spectrometry and chemical reactions.

Leguminosae, Vicia amurensis, acylated flavonol glycoside, amurenoside A, amurenoside B

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2. (Article ID: 12263)
 
Kang TH, Jeong SJ, Kim NY, Higuchi R, Kim YC
Sedative activity of two flavonol glycosides isolated from the flowers of Albizzia julibrissin Durazz
Journal of Ethnopharmacology 71(1-2) (2000) 321-323
 

The flowers of Albizzia julibrissin are used as a sedative in oriental traditional medicine. The phytochemical study of this plant allowed the isolation of two flavonol glycosides, quercitrin (1) and isoquercitrin (2). The sedative activity of these compounds was evaluated, and both compounds 1 and 2 increased pentobarbital-induced sleeping time in dose-dependent manner in mice. These results support the use of the flowers of this plant as a sedative agent.

flavonoids, Leguminosae, Albizzia julibrissin, sedative activity

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3. (Article ID: 12264)
 
Karsten U, West JA
Living in the intertidal zone — seasonal effects on heterosides and sun-screen compounds in the red alga Bangia atropurpurea (Bangiales)
Journal of Experimental Marine Biology and Ecology 254(2) (2000) 221-234
 

The seasonal patterns of daylength and ultraviolet radiation (UVB and UVA) at Williamstown, Victoria, Australia were measured (October 1995–May 1996) and are considered in relation to levels of heterosides (soluble sugar compounds: d-isofloridoside, floridoside and l-isofloridoside) and sun-screen compounds (mycosporine-like amino acids: MAAs) in the intertidal red alga Bangia atropurpurea. UVB peaked in December–January at 2.2–2.4 W m−2 and UVA also peaked at 70 W/m^2 in the same period. Total heteroside concentrations were highest (1230–1900 mmol kg−1 dry weight) during November–December with floridoside and d-isofloridoside being 90% of the total. In late February through mid-April total heteroside contents were lower (315–905 mmol/kg dry weight) with l-floridoside being as much as 34% of the total indicating a seasonal effect. Total MAAs varied from 3.4 to 7.1 mg/g dry weight (mean 4.9 mg/g dry weight) with both highest and lowest levels occurring in February. Porphyra-334 constituted 83 to 97% of this total with asterina-330, palythine and palythinol being 3–17%. Although maximum MAA concentrations did not show any significant parallel with the peak UV values, the quantitative data point to Bangia cells over the course of the seasons always loaded up with these photoprotective compounds.

floridoside, heterosides, D-isofloridoside, L-isofloridoside, mycosporine-like amino acids, MAAs, UV radiation

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