Search results for "Rhamnaceae"

Triterpene saponins from the roots ofAmpelozizyphus amazonicus

1992

A new triterpene saponin was isolated from the roots of Ampelozizyphus amazonicus together with the known 3-O-beta-D-glucopyranosyl-20-O-alpha-L-rhamnopyranosyljujubogenin and the known triterpenes melaleucic acid, 3 beta,27 alpha-dihydroxylup-20(29)-en-28 beta-oic acid, betulinic acid, betulin, lupeol. The structure of this saponin was elucidated as 3-O-[beta-D-glucopyranosyl(1----2)alpha-L-arabinopyranosyl]- 20-O-alpha-L-rhamnopyranosyljujubogenin by spectral analysis and chemical transformations.

Sobre los tipos nomenclaturales de dos táxones de Rhamnus (Rhamnaceae) de la flora valenciana

2015

Se designan los tipos nomenclaturales de dos taxones del género Rhamnus descritos de las comarcas valencianas. Por un lado, se lectotipifica el nombre Rh. lycioides var. pubescens Rouy −sinónimo de Rh. lycioides subsp. borgiae Rivas Mart. & J.M. Pizarro−, a partir del material original recolectado en las montañas de Játiva (Valencia). Por otro, se considera que el neótipo recientemente designado para el nombre Rh. valentina Willd. −sinónimo de Rh. pumila L.−, debería aceptarse realmente como un lectótipo. Nomenclatural types are designated for two taxa of the genus Rhamnus described from the Valencia Region (E of Spain). On the one hand, the name Rh. lycioides var. pubescens Rouy −a synonym…

A hypotensive procyanidin-glycoside from Rhamnus lycioides ssp. lycioides.

1990

A lyophilized hot water extract of the aerial parts of Rhamnus lycioides L. (Rhamnaceae) produced a lowering of systemic arterial blood pressure in normotensive anaesthetized Wistar rats. An activity-guided fractionation of the methanolic extract led to the isolation of a tetrameric procyanidin-glycoside which produced a clear dose-dependent hypotensive response (1.5-6 mg/kg i.v.). This principle was characterized using acid hydrolysis, thiolytic degradation and spectroscopic methods. It consisted of four flavanol units with a 2,3-cis configuration and with a O-beta-d-glucosylpyranoside function on the epicatechin terminal unit. The interflavan linkage was (4-8).

Flavonoids fromAlphitonia neocaledonica

1995

<p><strong>Typification of two Gandoger’s names in <em>Rhamnus </em>(Rhamnaceae)</strong></p>

2020

Gandoger’s names for Rhamnus bourgaeana and R. hispanorum (Rhamnaceae) are typified. A neotype is selected for R. bourgaeana, and a specimen preserved at M is designated as the lectotype of R. hispanorum.

Leaf domatia in the section Alaternus (Miller) DC. of the genus Rhamnus (Rhamnaceae)

1993

Anatomical and morphological study of leaves from three species of Rhamnus (R. alaternus, R. myrtifolius and R. ludovici-salvatoris) which comprise the section Alaternus (Miller) DC. from the Iberian Peninsula and Balearic Islands, have revealed the presence of domatia, which are macroscopic infundibuliform structures. Although not all the leaves of one single plant showed domatia, all the individuals of each species examined presented these structures.

A dammarane-type saponin from the roots of Ampelozizyphus amazonicus.

1993

A new C31 dammarane-type triterpenoid saponin has been isolated from the roots of Ampelozizyphus amazonicus. Its structure was elucidated to be ampelozigenin-15 alpha-O-acetyl- 3-O-alpha-L-rhamnopyranosyl-(1--2)-beta-D-glucopyranoside by 1D and 2D NMR spectroscopic methods, and by chemical transformations. Ampelozigenin is a novel triterpene, (20R,22R)-16 beta,22:16 alpha, 30-diepoxydammar-24(24')- methylene-3 beta, 15 alpha, 20-triol.