彭县雪胆的化学成分研究

从彭县雪胆块根中分得6个化合物。经理化性质及光谱分析分别鉴定为竹节参甙Ⅳa,雪胆皂贰Ma₁、雪胆皂甙G₁、雪胆皂甙口,、雪胆甲素及雪胆乙素,均系首次从该植物中得到。     

Cucurbitacin contents in Hemsleya dolichocarpa

Hemsleya dolichocarpa was studied for its cucurbitacin contents during growing period. A colorimetric method was used to determine the total cucurbitacin levels, and a TLC densitometric assay was employed for estimating dihydrocucurbitacin F and its acetate, two active principles in Hemsleya plants. Cucurbitacin contents rise progressively from May to November; the month of November is thus the most desirable time for harvesting plant materials for medicinal uses. It was noticed that the spoiled plant samples gave an intense color reaction while dihydrocucurbitacin F and its acetate levels were not significantly altered. The accuracy of the assays is discussed.     

中华雪胆化学成分研究(Ⅲ)

目的:研究中华雪胆化学成分。方法:应用色谱技术进行分离和纯化,采用UV,IR,MS,NMR等波谱技术鉴定结构。结果:从中华雪胆中分到8个三萜类化合物,分别为23,24-二氢葫芦素B(1),23,24-二氢葫芦素F-25-乙酸酯(2),葫芦素F(3),3-O-(6’-乙酯)-β-D-吡喃葡萄糖醛酸基-齐墩果酸-28-O-α-L-吡喃阿拉伯糖苷(4),齐墩果酸-3-O-(6’-甲酯)-β-D-吡喃葡萄糖醛酸基-(1-3)-α-L-吡喃阿拉伯糖苷(5),齐墩果酸-28-O-β-D-吡喃葡萄糖基(1-6)-β-D-吡喃葡萄糖苷(6),3-O-(6’-甲酯)-β-D-吡喃葡萄糖醛酸基-齐墩果酸-28-O-β-D-吡喃葡萄糖基-(1-6)-β-D-吡喃葡萄糖苷(7),3-O-(6’-甲酯)-β-D-吡喃葡萄糖醛酸基-(1-2)-β-D-吡喃葡萄糖基-齐墩果酸-28-O-β-D-吡喃葡萄糖苷(8)。结论:除化合物2外,其余化合物均是首次从中华雪胆中分离得到。     

维药药西瓜化学成分的分离与鉴定

目的研究药西瓜Citrullus colocynthis的化学成分。方法采用硅胶、Sephadex LH-20等色谱手段结合重结晶技术进行分离纯化,通过NMR波谱数据和理化性质确定化合物的结构。结果从药西瓜中分离得到11个化合物,分别鉴定为β-谷甾醇(1)、α-菠甾醇-3-O-β-D-吡喃葡萄糖苷(2)、α-菠甾酮(3)、双-[(2-乙基)己基]邻苯二甲酸酯(4)、对羟基苯甲酸(5)、6-C-对甲基苄基牡荆素(6)、双氢葫芦素E(7)、葫芦素E(8)、异表双氢葫芦素D(9)、双氢异葫芦素B-25-乙酯(10)、葫芦素E-2-O-β-D-吡喃葡萄糖苷(11)。结论化合物6为新化合物,命名为6-C-对甲基苄基牡荆素;化合物1～5、7、9、10均为首次从该属植物中分离得到。     

泽泻中的新三萜成分

目的 研究泽泻Alisma orientale的活性成分.方法 采用硅胶柱色谱和HPLC制备色谱分离技术,根据理化性质和光谱数据鉴定化合物结构.结果 从泽泻的醋酸乙酯萃取部分分离得到6个化合物,分别鉴定为11-羟基-13(17),25(27)-脱氢-原萜烷-3,24-二酮(1)、24-乙酰泽泻醇A(2)、24-乙酰泽泻醇F(3)、泽泻醇F(4)、泽泻醇G(5)、泽泻醇A(6).结论 化合物1为新化合物,命名为泽泻醇X.     

A New Flavone C-glycoside from Citrullus colocynthis

Objective To study the chemical constituents of Citrullus colocynthis. Methods The chemical constituents were isolated and purified by column chromatography on silica gel and Sephadex LH-20 and recrystallization as well. NMR spectra and physicochemical property were characterized for structural identification. Results Eleven compounds were isolated and identified as β-sitosterol (1), α-spinasterol-3-O-β-D-glucopyranoside (2), α-spinasterone (3), bis (2-ethylhexyl) phthalate (4), p-hydroxybenzoic acid (5), 6-C-p-methylbenzoylvitexin (6), dihydrocucurbitacin E (7), cucurbitacin E (8), dihydro-epi-iso-cucurbitacin D (9), dihydroisocucurbitacin B-25-acaetate (10), and cucurbitacin E 2-O-β-D-glucopyranoside (11). Conclusion Compound 6 is a novel compound. Compounds 1-5, 7, 9, and 10 are isolated from C. colocynthis for the first time.     

Chemical studies on Mexican plants used in traditional medicine, V. Cucurbitacin glucosides from Cigarrilla mexicana

The new cucurbitacin glucoside 2-O-beta-D-glucopyranosylcucurbitacin F 25-acetate and arvenin I were isolated from the more polar fractions of the MeOH extract of Cigarrilla mexicana.     

Investigation of antimicrobial model of Hemsleya pengxianensis W.J. Chang and its main active component by metabolomics technique

Aim of the study

H.pengxianensi is a native plant in China. Dihydrocucurbitacin F-25-O-acetate is one of the major chemical components in H.pengxianensis. In this investigation, we attempted to quantify the content of dihydrocucurbitacin F-25-O-acetate in H.pengxianensis and find the possible antibacterial mode of dihydrocucurbitacin F-25-O-acetate and H.pengxianensis.

Material and methods

First, the content of dihydrocucurbitacin F-25-O-acetate was quantified by HPLC. Then, metabolic profiles of Staphylococcus aureus treated by dihydrocucurbitacin F-25-O-acetate, extract of H.pengxianensis and nine antibacterial substances with the known modes of action were acquired by HPLC/DAD/ESI-MS. Principal component analysis was carried out upon all metabolic profiles to classify those drugs according to their mechanisms.

Results and conclusion

The HPLC result show the content of dihydrocucurbitacin F-25-O-acetate in H.pengxianensis (5.3 ± 0.4 mg/g). From the result obtained by principal component analysis, dihydrocucurbitacin F-25-O-acetate was found to be the component playing the main antimicrobial roles on Staphylococcus aureus in H.pengxianensis and the possible antibacterial mode of dihydrocucurbitacin F-25-O-acetate and H.pengxianensis may be to inhibit cell wall synthesis.     

Actin-aggregating cucurbitacins from Physocarpus capitatus

Bioassay-guided fractionation of Physocarpus capitatus yielded two new cucurbitacins (3 and 4) along with the known cucurbitacin F (1) and dihydrocucurbitacin F (2). Preliminary mechanism of action studies indicate that the cucurbitacins cause actin aggregates and inhibit cell division.     

New carbazole alkaloids from Clausena anisata with antitumor promoting activity

Four new carbazole alkaloids, named clausamine D (1), E (2), F (3), and G (4), were isolated from Clausena anisata as inhibitors of Epstein-Barr virus early antigen activation induced by 12-O-tetradecanoylphorbol-13-acetate in Raji cells.     

三七叶中低糖链皂苷的分离与鉴定

三七叶总苷经硅胶柱层析及反相RP-18柱层析分得6个低糖链皂苷成分,光谱分析及与标准品对照鉴定它们的结构分别为20(R)-人参皂苷-Rh_2、20(R)-人参皂苷-Rg_3、人参皂苷-Mc、人参皂苷-F_1、人参皂苷-rRh_1和胡萝卜苷。     

Chemical constituents of rhizoma Pinelliae pedatisecta]

Five compounds were isolated from the alkaloid extract of Rhizoma Pinelliae Pedatisecta and their structures were determined as pedatisectine F(I), hypoxanthine (II), erythritol (III), uridine (IV) and pedatisectine G (V), of which I and V are new compounds, while II, III and IV were found in this plant for the first time.     

泽泻的化学成分及其免疫抑制活性筛选

目的:研究泽泻Alisma orientalis的免疫抑制活性物质.方法:利用色谱技术进行分离和纯化,并通过现代波谱方法鉴定其结构,采用体外细胞培养法,测定萜类化合物对小鼠脾脏T淋巴细胞增殖的活性.结果:从泽泻中分离鉴定了12个化合物.分别为倍半萜类clovandiol(1),orientalol E(2),alismoxide(3),alismol(4)和三萜类4α,10α-dihydmxy-5β-H-guaj-6-en(5),alismorientols A(6),泽泻醇F(7),泽泻醇A(8),13β,17β-环氧泽泻醇A(9),23-乙酰泽泻醇B(10),1H-indole-3-carhox-ylic acid(11)和琥珀酸(12).化合物9,10和24-去乙酰泽泻醇A均具显示了剂量依赖性免疫抑制趋势.结论:化合物1,5,11和12均为首次从该属植物中分离得到,首次对化合物1的NMR波谱数据归属问题进行了修正,活性结果显示原萜烷型三萜类化合物具有一定的免疫抑制活性.     

Octanorcucurbitane and cucurbitane triterpenoids from the tubers of Hemsleya endecaphylla with HIV-1 inhibitory activity

Two new cucurbitacins, endecaphyllacins A (1) and B (2), together with six known analogues (3-8), were isolated from the tubers of Hemsleya endecaphylla. The structures of 1 and 2 were elucidated by NMR and MS spectroscopic analysis. The relative stereochemistry of 1 was determined by single-crystal X-ray diffraction. Compound 4 (cucurbitacin B) showed potent anti-HIV-1 in C8166 cells (EC=0.09 microg/mL) with a selectivity index of 16.7.     

New cytotoxic sterol glycosides from the octocoral Carijoa (Telesto) riisei

Two new steroidal glycosides, 3beta-O-(3'-O-acetyl-beta-D-arabinopyranosyl)-25xi-choles tan e-3beta, 5alpha,6beta,26-tetrol-26-acetate (riisein A, 2) and 3beta-O-(4'-O-acetyl-beta-D-arabinopyranosyl)-25xi-choles tan e-3beta, 5alpha,6beta,26-tetrol-26-acetate (riisein B, 3), were isolated from extracts of the Brazilian telestacean octocoral Carijoa (Telesto) riisei collected near Rio de Janeiro. The new glycosides co-occur with the polyhydroxy sterol, 25xi-cholestane-3beta,5alpha,6beta, 26-tetrol-26-acetate (1), an inseparable diastereomeric mixture previously reported from Telesto riisei collected in Micronesia. The structures of the new glycosides were assigned by spectroscopic methods and by comparison with spectral data for sterol 1. Riiseins A and B showed in vitro cytotoxicity toward HCT-116 human colon adenocarcinoma with IC(50) values of 2.0 microg/mL.     

Sileneoside H, a new phytoecdysteroid from Silene brahuica

Sileneoside H (1), a new phytoecdysteroid, has been isolated from the roots of Silene brahuica and identified as 22-O-alpha-D-galactosylintegristerone A 25-acetate by MS and NMR analysis.     

Bioactive brominated diterpenes from the marine red alga Jania Rubens (L.) Lamx

Seven brominated diterpenes of the parguerene and isoparguerene series were isolated for the first time from the red alga Jania rubens (L.) Lamx., collected from the Red Sea coast at Hurghada, Egypt. The diterpenes were identified as isoparguerol (1), isoparguerol-16-acetate (2), isoparguerol-7,16-diacetate (3), parguerol-16-acetate (4), parguerol-7,16-diacetate (5), deoxyparguerol (6) and deoxyparguerol-7-acetate (7).The isolated diterpenes had a marked antitumour activity. Isoparguerol derivatives were slightly more effective than parguerol derivatives. Moreover, the data implied that the cytotoxicity of these compounds were dependent on the number of acetoxy groups. Also, anthelmintic activities of the isolated compounds on earthworms (Allolobophora caliginosa) were studied.     

金荞麦中的酚酸类成分

目的:研究中药金荞麦中的化学成分。方法:采用多种色谱方法分离化学成分,依据理化性质、波谱数据分析进行结构鉴定。结果:从金荞麦中分离鉴定了4个酚酸类成分,分别为反式对羟基桂皮酸甲酯(trans-p-hy-droxy cinnamic methyl ester,Ⅰ),3,4-二羟基苯甲酰胺(3,4-dihydroxy benzamide,Ⅱ),原儿茶酸(protocatechuic acid,Ⅲ),原儿茶酸甲酯(protocatechuic acid methyl ester,Ⅳ)。结论:其中化合物Ⅰ,Ⅱ,Ⅳ为首次从荞麦属植物中分离得到。     

Antitubercular sesterterpenes from the Thai sponge Brachiaster sp

A new scalarane-type sesterterpene, 12-deacetoxyscalarin 19-acetate (2), and two naturally new derivatives of manoalide-type sesterterpenes, (E)- and (Z)-neomanoalide 24,25-diacetates (3 and 4), were isolated from the Thai sponge Brachiaster sp., along with five other known sesterterpenes: heteronemin (1), heteronemin acetate (5), 12-epi-19-deoxyscalarin (6), 12-deacetyl-12-epi-19-deoxyscalarin (7), and manoalide 25-acetate (8). The antitubercular and cytotoxic activities of all eight compounds were evaluated to reveal the potent activity of compounds 1, 2, 5, and 8. Among these, compound 2 showed an interesting bioactivity profile, in possessing potent antitubercular activity and being practically inactive in the cytotoxicity bioassay.     

Lucidenic acids P and Q, methyl lucidenate P, and other triterpenoids from the fungus Ganoderma lucidum and their inhibitory effects on Epstein-Barr virus activation

A new triterpene acid, lucidenic acid P (1a), and two new triterpene acid methyl esters, methyl lucidenates P (1b) and Q (2b), were isolated and characterized from the fruiting body of the fungus Ganoderma lucidum. Their structures were elucidated on the basis of spectroscopic methods. In addition, eight known triterpene acids, lucidenic acids A (3a), C (4a), D(2) (5a), E(2) (6a), and F (7a) and ganoderic acids E (9a), F (10a), and T-Q (11a), and six known triterpene acid methyl esters, methyl lucidenates A (3b), D(2) (5b), E(2) (6b), F (7b), and L (8b) and methyl ganoderate F (10b), were isolated and identified from the fungus. All of the triterpenoids, with the exception of 7a, were evaluated with respect to their inhibitory effects on the induction of Epstein-Barr virus early antigen (EBV-EA) by 12-O-tetradecanoylphorbol-13-acetate (TPA) in Raji cells, which is known to be a primary screening test for antitumor promoters. All of the compounds tested showed potent inhibitory effects on EBV-EA induction (96-100% inhibition at 1 x 10(3) mol ratio/TPA).