Flavonoid methyl ethers on the external leaf surface of Larrea tridentata and L. Divaricata

Sakakibara, Masayuki; Difeo, Dan; Nakatani, Nobuji; Timmermann, Barbara N.; Mabry, Tom J.

doi:10.1016/s0031-9422(00)94430-3

Cited by 68 publications

(37 citation statements)

References 15 publications

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“…This flavonol has been found only once before as a natural product (c .f [9]). Sakakibara et al reported it from the leaf resin of Larrea tridentata [10]. NAS-5 fits very well in the se ries of flavonol esters described earlier from Notholaena species (NA, NG, N A S [2]).…”

Section: Resultssupporting

confidence: 71%

New Flavonol Acetates from the Frond Exudate of the Fern Notholaena aschenborniana

Jay

Viricel

Favre-Bonvin

et al. 1982

Zeitschrift Für Naturforschung C

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Section: Resultssupporting

confidence: 71%

New Flavonol Acetates from the Frond Exudate of the Fern Notholaena aschenborniana

Jay

Viricel

Favre-Bonvin

et al. 1982

Zeitschrift Für Naturforschung C

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“…These active fractions were further subjected to reversed-phase preparative HPLC to afford 11 flavonoid glycosides. Thus, bioassay-guided fractionation of the 70% EtOH extracts led to the isolation of the antioxidants isoquercitrin [10], isorhamnetin-3-O-rutinoside [10], isorhamnetin-3-O-b-Dglucoside [11], glucoluteolin [12], chrysoriol-7-O-b-Dglucoside [12], orientin [13], vitexin [14], isoorientin [13], isovitexin [15], swertisin [16], and flavocommelin [17]. These known compounds were identified by comparison of their spectral ( 1 H-NMR, 13 C-NMR, and MS) data with the reported values.…”

Section: Resultsmentioning

confidence: 99%

Antioxidant constituents in the dayflower (Commelina communis L.) and their α-glucosidase-inhibitory activity

et al. 2008

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The dayflower, Commelina communis L., contains 1-deoxynojirimycin (DNJ) and (2R,3R,4R,5R)2,5-bis(hydroxymethyl)-3,4-dihydroxypyrrolidine (DMDP), potent alpha-glucosidase inhibitors. The extracts and powder of this herb are important food materials for prophylaxis against type 2 diabetes. Eleven flavonoid glycosides as antioxidants, isoquercitrin, isorhamnetin-3-O-rutinoside, isorhamnetin-3-O-beta-D-glucoside, glucoluteolin, chrysoriol-7-O-beta-D-glucoside, orientin, vitexin, isoorientin, isovitexin, swertisin, and flavocommelin, were identified from the aerial parts of C. communis. Their antioxidant activities were measured using in vitro assays employing the 1,1-diphenyl-2-picrylhydrazyl radical- and superoxide radical-scavenging assays. The results showed that glucoluteolin, orientin, isoorientin, and isoquercitrin are the predominant antioxidants in this herb. Moreover, isoquercitrin, isorhamnetine-3-O-rutinoside, vitexin, and swertisin inhibited the activity of alpha-glucosidase from rat intestine.

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“…semi-arid regions of the southwestern US. This genus has been the subject of extensive phytochemical study because external leaf resins compose 10-15% of the dry weight of leaves (Sakakibara et al, 1976). These resins are composed of nodirhydroquaeiretic acid (a powerful antioxidant), kaempferol and quercitin (plant growth inhibitors and UV absorbers) and a variety of C 15 and heavier compounds.…”

Section: Plant-scale Bvoc Emissionsmentioning

confidence: 99%

Biogenic volatile organic compound emissions from desert vegetation of the southwestern US

Geron

Guenther

Greenberg

et al. 2006

Atmospheric Environment

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Thirteen common plant species in the Mojave and Sonoran Desert regions of the western US were tested for emissions of biogenic non-methane volatile organic compounds (BVOCs). Only two of the species examined emitted isoprene at rates of 10 mg C g À1 h À1 or greater. These species accounted for o10% of the estimated vegetative biomass in these arid regions of low biomass density, indicating that these ecosystems are not likely a strong source of isoprene. However, isoprene emissions from these species continued to increase at much higher leaf temperatures than is observed from species in other ecosystems. Five species, including members of the Ambrosia genus, emitted monoterpenes at rates exceeding 2 mg C g À1 h À1 . Emissions of oxygenated compounds, such as methanol, ethanol, acetone/propanal, and hexanol, from cut branches of several species exceeded 10 mg C g À1 h À1 , warranting further investigation in these ecosystems. Model extrapolation of isoprene emission measurements verifies recently published observations that desert vegetation is a small source of isoprene relative to forests. Annual and daily total model isoprene emission estimates from an eastern US mixed forest landscape were 10-30 times greater than isoprene emissions estimated from the Mojave site. Monoterpene (and possibly oxygenated terpene and sesquiterpene) emissions may be more comparable, as annual forest terpene emission model estimates were 3-8 times greater than those from the Mojave Desert, and were within a factor of 2 for peak summertime fluxes. Primary productivity and leaf biomass of desert ecosystems are very dependent on annual precipitation, and our model results indicate that there can be at least a three-fold difference in total annual BVOC emissions between dry and wet years. We recommend additional studies of desert plant BVOC emissions, especially those that focus on sesquiterpenes, oxygenated compounds, and the effects of soil moisture, temperature, humidity, and seasonality. Landscape flux studies are needed to test BVOC model estimates and to verify BVOC influences on regional atmospheric chemistry. Published by Elsevier Ltd.

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Flavonoid methyl ethers on the external leaf surface of Larrea tridentata and L. Divaricata

Cited by 68 publications

References 15 publications

New Flavonol Acetates from the Frond Exudate of the Fern Notholaena aschenborniana

New Flavonol Acetates from the Frond Exudate of the Fern Notholaena aschenborniana

Antioxidant constituents in the dayflower (Commelina communis L.) and their α-glucosidase-inhibitory activity

Biogenic volatile organic compound emissions from desert vegetation of the southwestern US

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