The caffeoyl phenylethanoid glycosides from Lindernia ruellioides and their anti-HBV effects

Abstract

Five caffeoyl phenylethanoid glycosides, including two new ones linderruelliosides A (1) and B (2), were isolated from the leaves and stems of Lindernia ruellioides. Their structures were elucidated on the basis of spectroscopic methods, including extensive NMR and MS spectra. In addition, all these compounds were tested for their anti-HBV activity. Compounds 1, 3, and 4 showed anti-HBV activities, with IC₅₀ values of 54.87, 30.74, and 69.02 μM for HBsAg and 26.70, 5.17, and 7.08 μM for HBeAg, respectively.     

Six new diterpenoids from Croton laevigatus

Abstract

Six new ent-labdane-type diterpeniods (1?6), along with one known compound, were identified from the twigs and leaves of Croton laevigatus. Their structures were elucidated on the basis of extensive spectroscopic interpretation. Compounds 2 and 7 showed inhibitory activity against protein tyrosine phosphatase 1B (PTP1B) with IC₅₀ values of 4.11 and 8.33 μg/ml, respectively.     

A new acylated flavonol glycoside from Derris triofoliata

A new acylated flavonol glycoside, kaempferol 3-O-[(6″″-feruloyl)-β-D-glucopyranosyl-(1 → 3)]-[α-L-rhamnopyranosyl-(1 → 6)]-β-D-glucopyranoside and two known cyclolignan glycosides, (+)-lyoniresinol-3α-O-β-D-glucopyranoside and ( ? )-lyoniresinol-3α-O-β-D-glucopyranoside were isolated from n-BuOH extracts of the aerial parts of Derris triofoliata, their structures were determined from spectroscopic and chemical evidences.     

Cucurbitane and hexanorcucurbitane glycosides from the fruits of Cucurbita pepo cv dayangua

Phytochemical investigation of the fruits of Cucurbita pepo cv dayangua has led to the isolation of two cucurbitane glycosides: cucurbitacin L 2-O-β-d-glucopyranoside (1), cucurbitacin K 2-O-β-d-glucopyranoside (2) and two hexanorcucurbitane glycosides: 2,16-dihydroxy-22,23,24,25,26,27-hexanorcucurbit-5-en-11,20-dione 2-O-β-d-glucopyranoside (3) and 16-hydroxy-22,23,24,25,26,27-hexanorcucurbit-5-en-11,20-dione 3-O-α-l-rhamnopyranosyl-(1 → 2)-β-d-glucopyranoside (4). Compounds 1, 2 and 3 were isolated from Cucurbita genus for the first time, while compound 4 is a new one. Their structures were determined on the basis of chemical and spectroscopic evidence.     

Sinapic acid derivatives from the seeds of Raphanus nussatirus L.

A new disulfide glycoside, raphthioglucoside (1), and a new sinapic acid derivative, sinapic acid 5-hydroxymethylfurfural ester (2), together with sinapic acid (3) have been isolated from the seeds of Raphanus nussatirus L. The structures of compounds 1-3 were determined based on chemical analysis and spectroscopic methods (UV, 1D and 2D NMR, HRFABMS, HREIMS and elemental analysis).     

Two new alkyl glycosides from Clerodendranthus spicatus

Two new alkyl glycosides, 3-O-β-d-apifuranosyl-(1 → 6)-O-β-d-glucopyranosyl-(3S)-oct-1-en-3-ol (1, clerspide A) and 3-O-β-d-apifuranosyl-(1 → 6)-[β-d-xylopyranosyl-(1 → 2)]-O-β-d-glucopyranosyl-(3S)-oct-1-en-3-ol (2, clerspide B), have been isolated from the whole plants of Clerodendranthus spicatus (Labiatae). Their structures were established on the basis of spectroscopic analyses and chemical method.     

Digitoxin as an anticancer agent with selectivity for cancer cells: possible mechanisms involved

Accumulating preclinical and clinical data suggest that the cardiac drug digitoxin might be used in cancer therapy. Recent reports have shown that digitoxin can inhibit the growth and induce apoptosis in cancer cells at concentrations commonly found in the plasma of cardiac patients treated with this drug. Several mechanisms have been associated with the anticancer activity of digitoxin, yet at present it is unknown why malignant cells are more susceptible to this cardiac glycoside than non-malignant cells. This report analyses the possible anticancer mechanisms of digitoxin and proposes that the inhibition of glycolysis may be a key mechanism by which this natural product selectively targets cancer cells. Finally, whether or not there is enough evidence to support the clinical evaluation of digitoxin in patients with cancer is discussed.     

Studies on chemical constituents from Ilex pubescens

Two new phenolic glycosides, ilexpubsides A and B, along with four known lignan glycosides were isolated from the roots of Ilex pubescens. By spectral evidence, the structures of the new compounds were elucidated as 4-O-β-D-[6'-O-(4'-O-β-D-glucopyranosylvanilloyl)glucopyranosyl] vanillic acid (1) and syringinic 6'-O-β-D-xylopyranoside (2). The known compounds were identified to be liriodendrin (3), (-)-olivil (4), tortoside A (5) and (+)-cyclo-olivil (6). All compounds were first isolated from Ilex pubescens.     

正交试验法优选补肾祛瘀颗粒的提取工艺

目的:优选补肾祛瘀颗粒的提取工艺,为该制剂的工业化生产提供参考。方法:采用UV测定总多糖和总黄酮含量,检测波长分别为489,510 nm;采用HPLC测定二苯乙烯苷含量,流动相乙腈-水(22∶78),检测波长320 nm。以总多糖得率为指标,通过正交试验考察料液比、提取时间、提取次数、醇沉浓度对水提工艺的影响;以总黄酮、二苯乙烯苷提取量和浸膏得率的综合评分为指标,通过正交试验考察提取时间、提取次数、乙醇用量及体积分数对醇提工艺的影响。结果:最佳水提工艺为加12倍量水浸泡1 h,回流提取3次,每次1.5 h,醇沉浓度80%;总多糖得率8.682%。最佳醇提工艺为加10倍量80%乙醇回流3次,每次1.5 h;总黄酮和二苯乙烯苷提取量分别为660.19 mg·g-1和145.91μg·g-1,浸膏得率11.81%。结论:优选的提取工艺合理可行,为补肾祛瘀方的临床推广与应用提供实验依据。     

红直獐牙菜的苷类成分

目的：研究红直獐牙菜的苷类成分。方法：采用硅胶柱层析分离和Sephadex LH20纯化,经理化性质和波谱分析鉴定基化学结构。结果：从红直獐牙菜的水溶性部分得到7个化合物,他们分别为8－O－β－D-吡喃葡萄糖－1,5－二羟基－3－甲氧基Shan酮（I）、8－O－β－D－吡喃葡萄糖－1,3,5－三羟基Shan酮（Ⅱ）、1－O－β－D－吡喃葡萄糖－3,7,8－三羟基Shan酮（Ⅲ）、异荭草苷（Ⅳ）、落干酸（V）、龙胆苦苷（Ⅵ）和β－龙胆二糖（Ⅶ）。结论：化合物Ⅲ、Ⅳ、V和Ⅶ为首次从该植物中分得。