Results 171 to 180 of about 14,776 (215)

Cucurbitacin Contents in Hemsleya dolichocarpa

The American Journal of Chinese Medicine, 1991
Hemsleya dolichocarpa was studied for its cucurbitacin contents during growing period. A colorimetric method was used to determine the total cucurbitacin levels, and a TLC densitometric assay was employed for estimating dihydrocucurbitacin F and its acetate, two active principles in Hemsleya plants. Cucurbitacin contents rise progressively from May to
P Q, Yang, S Y, Liu, Z H, Cao, W J, Chang, C T, Che   +4 more
openaire   +2 more sources

Cucurbitacin glucosides fromCitrullus colocynthis

Natural Product Research, 2006
A new cucurbitacin glucoside 2-O-beta-D-glucopyranosyl-16alpha-20R-dihydroxy-cucurbita-1,5,23E,25(26)-tetraen-3,11,22-trione (1) has been isolated from the methanolic extract of the fruits of Citrulluscolocynthis. The structure has been assigned on the basis of spectral analysis including 1D and 2D NMR techniques.
Durey, Nayab, Dildar, Ali, Nuzhat, Arshad, Abdul, Malik, M Iqbal, Choudhary, Zaheer, Ahmed   +5 more
openaire   +2 more sources

Hexanor–cucurbitacin D, a degraded cucurbitacin from Begoniatuberhybrida var. alba

Canadian Journal of Chemistry, 1970
A compound isolated from Begoniatuberhybrida has been shown to have the structure of hexanor–cucurbitacin D (3). Its diacetate is identical to the neriodate cleavage product of cucurbitacin B diacetate.
Raymond W. Doskotch, Charles D. Hufford
openaire   +1 more source

Cytotoxic Cucurbitacin Constituents from Sloanea zuliaensis

Journal of Natural Products, 2003
A new cucurbitacin D analogue, 2-deoxycucurbitacin D (1), as well as cucurbitacin D (2) and 25-acetylcucurbitacin F (3) were isolated from Sloanea zuliaensis. Compound 1 was found only in the young leaves of the plant and not in the mature leaves, and its structure was established using spectroscopic means.
Rodriguez, Nelson, Vasquez, Yelkaira, Hussein, Ahmed A., Coley, Phyllis D., Solis, Pablo N., Gupta, Mahabir P.   +5 more
openaire   +2 more sources

New Cucurbitacin Glycosides fromPicrorhiza kurrooa

Planta Medica, 1989
From the roots of Picrorhiza kurrooa Royle and Benth., seven cucurbitacin glycosides have been isolated and structurally elucidated mainly by NMR and mass spectroscopy. Four of them (4, 5, 6, 7) are new and two, the 2-O-glycoside of cucurbitacin B (25-acetoxy-2-beta-glucosyloxy-16,20-dihydroxy-9-methyl-19-norl anosta-5, 23-diene-3,11,22-trione) and the
H, Stuppner, H, Wagner
openaire   +2 more sources

Cucurbitacins as Constituents ofWilbrandia ebracteata

Planta Medica, 1993
The methanolic extract from the roots of WILBRANDIA EBRACTEATA afforded, in addition to the known dihydrocucurbitacins B and E, dihydroisocucurbitacin B, Cucurbitacins B, D, E, G, H, P, and 22-deoxycucurbi-tacin D, four new compounds whose structures were elucidated as (20 R,24xi)-3)3beta,16alpha,20)24,25-pentahydroxy-10alpha-cucurbit-5-ene-2,11,22 ...
M R, Farias, E P, Schenkel, R, Mayer, G, Rücker   +3 more
openaire   +2 more sources

Biosynthesis of Cucurbitacins inBryonia dioicaSeedlings

Planta Medica, 1981
The biosynthesis of cucurbitacins during the seed germination of Bryonia dioica was studied by analysis of the cucurbitacin-triterpenoid fraction and by tracer experiments with acetate-[2- (14)C]. Isolation of 10alpha-cucurbita-5,24-dien-3beta-ol (9a), the simplest tetracyclic triterpene with a cucurbitane skeleton, supports the view that (9a) is the ...
L, Cattel, G, Balliano, O, Caputo, F, Viola   +3 more
openaire   +2 more sources

Cucurbitacins with Unusual Side-Chains fromPicrorhiza kurrooa

Planta Medica, 1993
Abstract From the roots of Picrorhiza kurroa six new cucurbitacin glycosides, (2β,9β,10α,16α,20ξ,24ξ)-20,24-epoxy-2-(β- d -glucopyranosyloxy)-16,25-dihydroxy-9-methyl-19-norlanost-5-ene-3,11-dione, (2β,3β,9β,10α,16α,20ξ,24ξ)-20,24-epoxy-2-(β- d -glucopyranosyloxy)-3,16,25-trihydroxy-9-methyl-19-norlanost-5-en-11-dione, (2β,9β,10α,16α,20ξ,24ξ)-20,24 ...
H. Stuppner, E.P. Moller
openaire   +1 more source

Complement-Inhibiting Cucurbitacin Glycosides fromPicria fel-terrae

Journal of Natural Products, 1998
Four cucurbitacin glycosides were isolated from Picriafel-terrae and identified by MS and NMR spectroscopy as picfeltarraenin IA (1), picfeltarraenin IB (2), picfeltarraenin IV (4), and a new compound picfeltarraenin VI (3) (picfeltarraegenin I 3-O-beta-D-xylopyranoside).
Huang, Y., de Bruyne, Tessa, Apers, Sandra, Ma, Y., Claeys, Magda, vanden Berghe, Dirk, Pieters, Luc, Vlietinck, Arnold   +7 more
openaire   +3 more sources

Four New Cucurbitacins from the Fruit of Momordica charantia

Helvetica Chimica Acta, 2014
AbstractFour new 5β,19‐epoxycucurbitacins, kuguacins T–W (1–4, resp.), along with nine known cucurbitane derivatives, 5–13, were obtained from the fresh fruit of Momordica chrantia. Structures of the new metabolites were elucidated as 5β,19‐epoxy‐25‐hydroxycucurbitane‐3,7,23‐trione (1), 5β,19‐epoxy‐3,7‐dioxo‐23,24,25,26,27‐pentanorcucurbitan‐22‐oic ...
Jian‐Chao Chen, Xiao‐Xi Yuan, Lin Zhou, Jie‐Qing Liu, Yin Nian, Zhong‐Rong Li, Yan Li, Ming‐Jin Xie, Ming‐Hua Qiu   +8 more
openaire   +1 more source