僵蚕中一个新的香豆素苷类化合物

目的 研究僵蚕的化学成分，并对从僵蚕中分离得到的一个新的香豆素苷类成分进行结构鉴定。方法 应用硅胶、Sephdex LH-20柱色谱和重结晶等方法进行分离，利用光谱方法对分离得到的单体成分进行结构鉴定。结果 分离并鉴定出8个化合物分别为：6-甲氧基-7-O—β—D-(4′-甲氧基)吡喃葡萄糖基香豆素[6-methoxy-7-O—β-D-(4′-methoxy)glucopyranosyl coumarin，Ⅰ]、麦角甾-6，22-二烯3β，5α，8α-三醇(ergost-6，22-dien-3β，5α，8α—triol，Ⅱ)、棕榈酸(palmidcacid，Ⅲ)、赤藓醇(meso—erythritol，Ⅳ)、甘露糖醇(D-mannitol，Ⅴ)、尿嘧啶(uracil，Ⅵ)、β-谷甾醇(β-sitosterol，Ⅶ)、胡萝卜苷(daucosterol，Ⅷ)。结论 化合物Ⅰ为新香豆素苷化合物。     

民族药紫红獐牙菜中酮成分的分离与鉴定

目的：提取分离和鉴定民族药紫红獐牙菜中的口山酮成分。方法：采用常压及加压硅胶柱层析等方法进行提取分离，用ＵＶ、ＩＲ、１Ｈ－ＮＭＲ、ＭＳ波谱技术及有关理化性质进行分析鉴定。结果：从紫红獐牙菜乙醇提取物中的乙酸乙酯萃取部分分离鉴定出７个单体化合物，化合物Ⅰ为８－０－β－Ｄ－吡喃葡萄糖－１，３，５－三羟基口山酮；Ⅱ为１，５，８－三羟基－３－甲氧基口山酮；Ⅲ为１，３，５，８－四羟基口山酮；Ⅳ为８－０－β－Ｄ－吡喃葡萄糖－１，５－二羟基－３－甲氧基口山酮；另３个化合物正在鉴定中。结论：对该民族药中的有效成分之一———口山酮类成分进行了系统提取分离与鉴定     

密蒙花中的苯丙素酚甙和黄酮甙研究

从醉鱼草属植物密蒙花的花蕾中分离得到6个苯丙素酚甙类成分，分别鉴定为verbascoside（1），cistanoside F(2),β-hydroxyacteoside(3),poliumoside(4),echinacoside(5),martynoside(6)，它们在体外实验中显示了一定的抗肿瘤活性，同时还分离得到两个黄酮甙：蒙花甙（7）和芹菜素－7－芦丁糖甙（8）。其中化合物（2），（3），（4），（8）为首次从醉鱼草属中分离得到。     

A new flavonol galloylrhamnoside and a new lignan glucoside from the leaves of <Emphasis Type="Italic">Koelreuteria henryi</Emphasis> Dummer

A new flavonol galloylrhamnoside, kaempferol 3-O-(2″,3″-di-O-galloyl)-α-l-rhamnopyranoside, and a new lignan glycoside, hinokinin 7-O-β-d-glucopyranoside were isolated from the leaves of Koelreuteria henryi, along with 18 known compounds, including six flavonol glycosides (3–8), three lignans (9–11), four chlorophyll derivatives (12–15), two steroids (16, 17), and three aromatic compounds (18–20). The structures were determined on the basis of spectral analysis and chemical evidence. The scavenging effect of 1–8 and 20 on the stable free radical 1,1-diphenyl-2-picrylhydrazyl was examined. Compounds 1, 5, 6, and 20 showed more potent activity than that of trolox.     

Saponins and flavonoid glycosides from yellow sweetclover

A new saponin, 3-O-[a-L-rhamnopyranosyl(1→2)-β-D-glucopyranosyl(1→2)-β-D-glucuronopyranosyl]soyasapogenol B carboxylate (6) has been isolated from the medicinal plant yellow sweetclover together with azukisaponin II(7), robinin(8), and clovin(9). 7, 8, and9 are reported for the first time from this plant. The new saponin(6) exhibited inhibitory action on leucocyte migration in inflammation.     

A new monoterpene glycoside and antibacterial monoterpene glycosides fromPaeonia suffruticosa

Antibacterial activity-guided fractionation of the CHCI3-MeOH (1:1) extract of Paeonia suffruticosa root bark furnished three monoterpene glycosides, 6-O-vanillyoxypaeoniflorin (1), mudanpioside-H (2), and galloyl-oxypaeoniflorin (3). Of the isolated compounds, compound 1 is a new compound. All isolated compounds showed broad, but moderate, antibacterial activity with minimum inhibitory concentration (MIC) values in the range of 100 to 500 microg/mL against eighteen pathogenic microorganisms of concern for public health or zoonosis.     

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.     

Dolichandroside,a new phenolic triglycoside from <Emphasis Type="Italic">Dolichandrone serrulata</Emphasis> (DC.) Seem.

A new phenolic triglycoside, dolichandroside, was isolated from the branches of Dolichandrone serrulata together with decaffeoyl-verbascoside, verbascoside, isoverbascoside, markhamioside A, 2-O-apiosylverbascoside, luteoside B and ixoside. The structure elucidations were based on analyses of spectroscopic data.     

The influence of changes in extracellular and intracellular sodium concentration on detrusor contractility

OBJECTIVE: To determine the role of Na+-Ca2+ exchange in the regulation of isolated detrusor smooth muscle contractility. MATERIALS AND METHODS: Isolated guinea-pig detrusor strips were used to record isometric tension generated by; (a) electrical-field stimulation to elicit nerve-mediated responses; and (b) adding carbachol or superfusing with a high-K+ solution. The [Na+] gradient between extracellular and intracellular compartments was altered by: (i) reducing superfusate [Na+] in stages from 140.2 to 10.2 mm; (ii) addition of the cardiac glycoside strophanthidin (200 microm). RESULTS Reducing extracellular [Na+] reversibly reduced the magnitude of nerve-mediated contractions but increased the resting tension and magnitude of carbachol-induced contracture. The mean (sd) [Na+] required for a half-maximum effect on attenuating contractions, at 85.9 (6.2) mm, and developing contracture, at 59.1 (14.3) mm, were significantly different. The time constants of changes to nerve-mediated contractions and carbachol contracture were also significantly different, at 147 (5) vs 1207 (386) s, respectively. These differences suggest that separate mechanisms influence nerve-mediated contraction and contracture in low-Na+ solutions. Exposure to the cardiac glycoside strophanthidin produced a similar effect to low-Na+ solutions for carbachol contracture. Low-Na+ solutions had no significant effect on contractures induced by high extracellular [K+]. CONCLUSION Reducing the transmembrane [Na+] difference increases intracellular [Ca2+]. This increase is largely accommodated in intracellular stores, that can be released by exogenous carbachol. The results are consistent with the presence of a functional Na+-Ca2+ exchanger in the surface membrane. The lack of effect of low-Na+ solutions on contractures evoked by membrane depolarization is consistent with this conclusion. The reduction of the nerve-mediated contraction by low-Na+ solution might result from blockade of the nerve action potential.     

Reversible inhibition of (Na+ + K+)-ATPase with a cardiac glycoside.

The effect of a semisynthetic cardiac glycoside, Actinogen (Ay22241), on Na+ + K+ - ATPase was studied. Ay22241 was found to be as an effective inhibitor of the enzyme as ouabain, Ay22241 inhibition was a time dependent process and was completely reversible. While ouabain inhibition was also time dependent, it was only partially reversible. This reversibility with Ay22241 should make it a useful tool in studying the mode of action of cardiac glycosides.