Search results for "Rhamnus"

Isolation and identification of new anthraquinones from Rhamnus alaternus L and evaluation of their free radical scavenging activity

2018

From the butanolic and the ethyl acetate extracts of Rhamnus alaternus L root bark and leaves, three new anthraquinone glycosides, alaternosides A-C (1,4,6,8 tetrahydroxy-3 methyl anthraquinone 1-O-ß-D-glucopyranosyl-4,6-di-O-α-L-rhamnopyranoside (1); 1,2,6,8 tetrahydroxy-3 methyl anthraquinone 8-O-ß-D-glucopyranoside (2) and 1, 6 dihydroxy-3 methyl 6 [2′-Me (heptoxy)] anthraquinone (3)) were isolated and elucidated together with the two known anthraquinone glycosides, Physcion-8-O-rutinoside (4) and emodin-6-O-α-L-rhamnoside (5) as well as with the known kaempferol-7-methylether (6), β-sitosterol (7) and β-sitosterol-3-O-glycoside (8). Their chemical structures were elucidated using spectr…

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 ofRhamnus lycioides; Part 2

1988

<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.

Growth and biomass partitioning of Arbutus unedo, Laurus nobilis, Phillyrea angustifolia and Rhamnus alaternus seedlings under water deficit

2013

Water scarcity in the Mediterranean areas is very common and the selection of drought tolerant species is a priority for landscaping purposes in the Mediterranean areas. The objective of this study was to evaluate the effect of water deficit on growth and biomass partitioning of Arbutus unedo, Laurus nobilis, Phillyrea angustifolia and Rhamnus alaternus. Seventy-two seedlings per species were grown in the greenhouse in 4-liter pots and three water regimes were imposed starting on 6 April and until 9 June, 2010. One-third of the plants was well irrigated to maintain soil water content in the 25-35% range (CTR); a second group of plants was deficit-irrigated to maintain soil water content in …

Flavonoid Constituents of Rhamnus lycioides L.

1986

Abstract From the aerial part of Rhamnus lycioides, which is used in folk medicine in eastern Spain as an antihypertensive drug, seven free flavonoid aglycones were isolated. They were structurally eluci­dated as rhamnazin. rhamnocitrin, isorhamnetin, kaempferol, quercetin. quercetin-3-methylether and taxifolin. by applying the principal spectroscopic methods and TLC with authentic markers.