Triterpenoids from Rhaponticum Uniflorum

The isolation and identification of twenty‐one components (including four new triterpenoid saponins and one new triterpenoid acid) from the root of Rhaponticum uniflorum (L.) DC. (Compositae) are described. Their structures were determined on the basis of spectral analysis and chemical trans formation. The new compounds were identified as 3‐O‐α‐L‐arabinopyranosyl‐urs‐12,18(19)‐dien‐28‐oic acid β‐D‐glucopyranosyl ester, 3β‐ hydroxyurs‐12,18(19)‐dien‐28‐oic acid β‐D‐glucopyranosyl ester, 3β‐hydroxyurs‐12,19(29)‐dien‐28‐oic acid β‐D‐glucopyranosylester, 3‐O‐α‐L‐arabinopyranosyl‐urs‐9(11),12‐dien‐28‐oic acid β‐D‐glucopyranosyl ester and 2 α,3 α, 19α,25‐tetrahydroxyurs‐12‐en‐23,28‐dioic acid.     

Two new triterpenoid saponins from Rhaponticum uniflorum

Two new triterpenoid saponins were isolated from the roots of Rhaponticum uniflorum.Their structures were elucidated as 3-O-[β-D-glucopyranosyl] -ilexolic acid-28-O-[β-D-glucopyranosyl]ester 1 and 3-O-[β-D-glucopyranosyl]-urs-12,19(29)-dien-oic acid-28-O-[β-D-glucopyranosyl]ester 2 mainly by 1D,2D NMR techniques and chemical methods.     

一种新蜕皮甾酮化学结构的核磁共振研究

本文首次报道了从祁州漏芦中分离得到的一种新的蜕皮甾酮类化合物的化学结构,主要利用各种核磁共振方法并结合其它光谱数据,确定其结构为2β,3β,11α,14α,20,22,24-七羟基-5β(20R,22R,24S)-胆甾-7-烯-6-酮,命名为漏芦甾酮(Rhapontisterone)。     

Neutral lipids from seeds of Asteraceae plants

Lipids from seeds of three plants of the Asteraceae family, Cousinia franchetii, Arctium leiospermum, and Rhaponticum integrifolium, were studied. The principal constituents of lipids from the three plants were shown to be acylglycerides of ordinary fatty acids and oxygenated fatty acids using chemical and chromatographic analyses. The composition of the ordinary unoxidized and epoxy acids was determined by GC. Presented at the 7th International Symposium on the Chemistry of Natural Compounds, October 16–18, 2007, Tashkent, Uzbekistan __________ Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 115–117, March–April, 2008.     

石墨炉原子吸收光谱法测定中药漏芦中微量铅

中药漏芦具有抑制动脉粥样硬化、抗脂质过氧化、减弱血小板聚集和提高免疫力等作用[1]。测定中药中微量元素的含量,对于探讨中药药理、提高药效和降低毒副作用有重要的意义[2,3]。铅是一种毒性元素,它在人体中具有累积性,通过肠胃道吸收,严重损害神经系统、造血系统和消化系统,从而导致肌体免疫力降低。本文选用磷酸氢二铵为基体改进剂,采用石墨炉原子吸收光谱法,对漏芦中Pb的含量进行了测定,考察了影响测定结果的主要因素。样品分析结果表明,本法简便、快速、灵敏、准确。1　实验部分1 1　仪器及工作条件180 80型原子吸收分光光度计、…     

A New Ecdysteroid from Rhaponticum uniflorum

The root of Rhaponticum uniflorum (L.) DC. was used in China as a chinese traditional medicine for the treatment of fever and intoxications1. Since the 1980s this plant have been studied and some phytoecdysteroids and other compounds were isolated2-4. We report here the isolation and structural elucidation of a new ecdysteroid 2, 3, 20, 22-diacetonide ajugasterone (1), as well as the isolation of three known ecdysteroids, ecdysterone (2), ajugasterone C (3), ajugasterone C-20, 22-monoacetoni…     

祁州漏芦中蜕皮甾酮类化学成分的研究

从祁州漏芦的根中分离得到7个蜕皮甾酮化合物,采用近代光谱方法鉴定其为ajugasteroneC-2,3;20,22-diacetonide(1);25-deoxy-9(11)-dehydro-20-hydroxyecdysone-20,22-monoacetonide(2);ajugasteroneC-20,22-monoacetonide(3);ajugasteroneC(4);rhapontisteroneC(5);ecdysterone(6);11α-hydrox-yecdysteroneecdysterone(7).其中化合物1和2是在自然界中首次分离到的新化合物,化合物3是首次在祁州漏芦中分离得到的.     

Three New Thiophene Acetylenes from Rhaponticum uniflorum (L.) DC.

Three new thiophene‐acetylenes, 7‐chloroarctinone‐b ( 1 ), rhapontiynethiophenes A ( 2 ) and B ( 3 ), along with arctinone‐b ( 4 ) were isolated from the MeOH extract of the roots of Rhaponticum uniflorum (L.) DC. The structures of the new compounds were elucidated by detailed spectroscopic data analysis and by comparison with known compounds.     

Bioactive compounds and antioxidant activity of Rhaponticum acaule (L.) DC

Abstract

Rhaponticum acaule (L.) DC. is a medicinal plant commonly used for the treatment of some illnesses such as gastrointestinal infections. In this work, we report the composition of different parts of this plant on phenolic compounds, their quantification, and antioxidant activity. The obtained results reported that methanolic extracts of the three parts studied revealed high phenolic contents. For flavonoid contents, the highest contents were reported in organic extracts of leaf part. In addition, results obtained from the study of the antioxidant activity showed that methanolic extract of root presented the highest activity, in DPPH^? scavenging ability test with an IC₅₀ of 0.31?±?0.04?mg/mL and in FRAP test with an EC₅₀ of 1.06?±?0.02?mg/mL. The RP-HPLC-PDA analysis revealed the presence of five phenolic acids (sinapic, caffeic, chlorogenic, ferulic and syringic acids), one flavanone (naringenin), one flavonol (rutin) and vanillin.