仙鹤草的抗菌儿茶素衍生物

仙鹤草广泛分布于亚洲。中医用于止血、驱虫和抗炎。从该植物中已分离到仙鹤草内酯(agrimonolide)、仙鹤草酚(agrimophol)、仙鹤草酸(agrimol)、仙鹤草酸A、B(agrimon-ic acid A,B)及agrimoniin。作者从仙鹤草中分离到新的儿茶素衍生物,即龙芽草醇A、B、C(pilosanol A,B,C)。这三种化合物对金黄色葡萄球菌均有抗菌作用。取仙鹤草根3.27kg,用丙酮提取。提取     

美丽红豆杉中非紫杉烷类化学成分的研究

目的：研究美丽红豆杉针叶中的化学成分。方法：通过色谱技术进行分离,利用质谱、核磁共振等波谱技术鉴定化合物结构。结果：从美丽红豆杉的针叶中分离得到5个化合物,分别鉴定为taxamairin A(1),taxamairin B(2),sciadopitysin(3),(-) matairesinol(4),ponasterone A(5)。结论：化合物3～5为首次从该植物中分离得到,化合物1和2为首次从该植物针叶中分离得到。     

光肺衣的化学成分研究

从地衣植物光肺衣中分离得到6个化合物,经光谱数据分析鉴定它们的结构分别为ergosterol(1),stict-an-3β,22α-diol(2),ethyl orsellinate(3),3-O-methyl-1,2∶5,6-bis-O-(1-methylethylidene)-d-chiro-inositol(4),retigericacid B(5)和retigeric acid A(6)。化合物1~4均系首次从本植物中分离得到。     

宽叶金粟兰中具抗乳腺癌转移活性的倍半萜类化学成分研究

利用多种色谱分离方法和波谱学鉴定方法对宽叶金粟兰乙酸乙酯部位的化学成分进行了分离鉴定,并借助药理学方法对其中得到的部分化合物进行了抗乳腺癌转移活性的初步筛选。总共从宽叶金粟兰乙酸乙酯部位中分离得到15个倍半萜及其二聚体类化合物,分别鉴定为zedoarofuran(1),chlorajapolide D(2),4β,8β-dihydroxy-5α(H)-eudesm-7(11)-en-8,12-olide(3),curcolonol(4),lasianthuslactone A(5),chlomultin C(6),(1E,4Z)-8-hydroxy-6-oxogermacra-1(10),4,7(11)-trieno-12,8-lactone(7),shizukanolide E(8),shizukanolide F(9),9α-hydroxycurcolonol(10),shizukaol B(11),shizukaol C(12),cycloshizukaol A(13),sarcandrolide B(14),henriol A(15)。其中化合物2,8~10为首次从该属植物中分离得到,化合物2,5,8~10,12,14为首次从该植物中分得。并对所分得量较大的5个化合物进行了抗乳腺癌转移活性筛选,其中化合物4,11,12表现出较强的活性。     

青钱柳化学成分的研究(Ⅰ)

从青钱柳嫩叶的氯仿提取物中分离到两种无色针状结晶,经光谱学和化学分析鉴定为咖啡因(Caffeine,A)和β-谷甾醇(β-sitosterol,B)。均系首次从该植物中分离得到。     

桂郁金化学成分研究Ⅰ

 目的研究中药桂郁金的化学成分。方法通过大孔树脂、反复硅胶柱色谱、ODS柱色谱和重结晶的方法进行分离纯化,通过化合物的理化性质和波谱数据进行结构鉴定。结果分离得到7个化合物,分别为zedoarolide B(Ⅰ),zedoarondiol(Ⅱ),zedoalactone A(Ⅲ),alismoxide(Ⅳ),isozedoarondiol(Ⅴ),curcumenol(Ⅵ)和β-谷甾醇(Ⅶ)。结论化合物Ⅰ～Ⅵ均为首次从本植物中分离得到。     

从荚蒾属植物的叶中分离到黄酮甙

Viburnum awabuki K.Koch(忍冬科Caprifoliaceae)是生长在日本冲绳县的一种鱼毒植物。从其叶中已分离到大量化学成分,如:Vibsanines,香豆素甙类和三萜类。从该植物中分离到的Vibsanine A和B分别是piscicidal 化合物和植物生长抑制剂。本文报道从V.awabuki的叶中分离到8种黄酮醇甙1～8.     

植物木脂素对分裂素诱发人外周血液淋巴细胞增生的抑制作用

许多药用植物中的酚性化合物如木脂素,黄酮具有抑制细胞增生及抗肿瘤活性,本文旨在评价9种植物木脂素对由刀豆球蛋白A诱发的人外周血液淋巴细胞增生的抑制作用。由樟科植物红楠Machilus thunbergi中分离的樟皮碱B(nectardrin B)、利卡灵B(licarin B)、楠木脂素A(machilin A)及介二氢愈创木酸(meso-dihydro-guaiareticacid);由假山胡椒Parabenzoin trilobum中分离的对羟苯甲基内酯〔(一)-paraben-     

桑根皮的降血压成分桑白皮素A的结构

从桑科植物的根皮(即桑白皮)中作者曾分出一个降血压的成分桑白皮素B(Mora-cenin B)并确定了它的化学结构。在分离桑白皮素B的过程中,作者从该植物的提取物的酸性部位经层析方法获得了一个具有降血压活性的部位,从该部位中得到了另一个无定形的异戊烯基黄酮衍生物,命名为桑白皮素A(Moracenin A),它对大鼠(静注)有明显的降血压作用。本文详细介绍了桑白皮素A的结构测定。     

显脉香茶菜化学成分研究Ⅲ

目的 研究唇形科香茶菜属植物显脉香茶菜Isodon nervosus(Hemsl)C.Y.Wu et H.W.Li的化学成分,寻找抗肿瘤活性成分.方法 采用多种色谱技术进行分离纯化,通过理化常数和波谱分析进行结构鉴定.结果 从显脉香茶菜中分离得到7个化合物,其结构鉴定为maoecrystal D(Ⅰ),rubescensin Q(Ⅱ),rabdotemin A(Ⅲ),rabdoternin B(Ⅳ),effusanin A(Ⅴ),narcosin(Ⅵ),oleanolic acid(Ⅶ).结论 化合物Ⅰ～Ⅳ为首次从该植物中分得.     

Chemical constituents of the leaves of Acanthopanax trifoliatus (Linn) Merr.]

Nevadensin (A), kaur-16-en-19-oic acid (B), taraxerol (C) and taraxerol-acetate (D) were isolated from the leaves of Acanthopanax trifoliatus. A and B were isolated for the first time. Pharmacological experiments have shown that nevadensin possesses expectorant and antitussive actions.     

白簕叶的化学成分研究

从大齿山芹根中分得11个结晶,鉴定了9个:肉豆蔻酸、棕榈酸、硬脂酸、二十八烷酸、丁二酸、β-谷甾醇、胡萝卜甙、异东莨菪素和蔗糖。本结果为植物分类学的研究提供化学依据。     

Cucurbitane triterpenes from the fruiting bodies and cultivated mycelia of Leucopaxillus gentianeus

A reinvestigation of the fruiting bodies of the mushroom Leucopaxillus gentianeus, allowed the isolation of two minor cucurbitane triterpenes, namely, cucurbitacin D (5) and the new metabolite 16-deoxycucurbitacin B (6). The latter compound lacks an oxygenated substituent at C-16, an unprecedented structural feature among congeners of cucurbitacin B. The cucurbitanes present in the fruiting bodies were compared with those extracted from mycelia grown on the modified Melin-Norkans (MMN) culture medium. Cucurbitacins B (1) and D (5), as well as leucopaxillones A (3) and B (4), were isolated from both sources; in contrast, 16-deoxycucurbitacin B (6) and a mixture of fatty acid esters of cucurbitacin B (2) were absent in the mycelia. A new triterpene, 18-deoxyleucopaxillone A (7), was isolated from the mycelia, but was not detected in the fruiting bodies. The antiproliferative activity of the isolated triterpenes was determined against the NCI-H460 human tumor cell line, in comparison with the antitumor compound topotecan, a well-known topoisomerase I inhibitor.     

Holothurins B(2), B(3), and B(4), new triterpene glycosides from mediterranean sea cucumbers of the genus holothuria

Triterpene glycosides of three species of the Mediterranean sea cucumbers Holothuria polii, Holothuria tubulosa, and Holothuria sp. were studied. Three new monosulfated biosides, holothurins B(2) (1), B(3) (2), and B(4) (3), along with the previously known holothurins A (4) and B (5) were isolated from the sea cucumber H. polii. Triterpene glycosides belonging to holothurin A and B groups were found in H. tubulosa, while only one individual glycoside, holothurin A (4), was isolated from Holothuria sp. Structures of new substances were elucidated on the basis of spectral data (2D NMR and MS). The significance of holothurins as chemotaxonomic markers of the animals belonging to the genus Holothuria and taxonomic status of some representatives of the holothurians studied are discussed.     

Spongiadioxins A and B, two new polybrominated dibenzo-p-dioxins from an Australian marine sponge Dysidea dendyi.

Two new cytotoxic tetrabromodibenzo-p-dioxins, spongiadioxins A (1) and B (2), were isolated from an Australian marine sponge Dysidea dendyi. The structures of these compounds were established by 1D and 2D NMR spectroscopy, X-ray analysis of the methyl ether of spongiadioxin A (3), and synthesis of the methyl ether of spongiadioxin B (4) from diphenyl ether (9) isolated from Dysidea herbacea.     

Expanding the strategies in natural product studies of marine-derived fungi: a chemical investigation of penicillium obtained from deep water sediment

Three previously unknown pentaketides, (+)-formylanserinone B (3), (-)-epoxyserinone A (4), and (+)-epoxyserinone B (5), along with two known fungal pigments, anserinones A (1) and B (2), were isolated and identified from a deep water (-4380 ft), marine-derived saltwater fungal culture. Two other minor constituents, hydroxymethylanserinone B (6) and deoxyanserinone B (7), were also isolated, but not completely purified. The structures of 3-7, each expanding the dense functionalization of the anserinones, were determined by dereplication and spectroscopic analysis. Bioactivity was explored in two separate cell-based assays. Leukemia selectivity was greatest with 2 and 3, while 1-3 exhibited modest activity against the MDA-MB-435 cell line.     

New sesquiterpene hydroquinones from a Taiwanese marine sponge, Hippospongia metachromia.

In addition to metachromins A (1), B (2), and E (9), two new sesquiterpene hydroquinones, hippochromins A and B (3, 4), were isolated from the Taiwanese marine sponge Hippospongia metachromia. The structures of 4--6 were established by extensive 2D NMR analysis. Metachromins A (1) and B (2), hippochromin A diacetate (5), and metachromin B monoacetate (8) exhibited potent cytotoxicities against human colon (COLO-205) and nasopharyngeal (KB) tumor cells, while compounds 6, 7, and 9 were inactive.     

穗花蛇菰的化学成分研究

目的：研究穗花蛇菰的化学成分。方法：采用硅胶柱色谱和反相制备色谱对化合物进行分离纯化,应用IR,NMR,MS等波谱法进行结构鉴定。结果：从穗花蛇菰中分离得到8个化合物,分别为蛇菰素A(1),蛇菰素B(2),β-香树脂醇乙酸酯(3),Monogynol A(4),羽扇豆酮(5),咖啡酸乙酯(6),儿茶素(7),1-O-(E)-caffeoyl-3-O-galloyl-β-D-glucopyranose(8)。结论：所有化合物均为首次从该植物中分得,其中化合物4为首次从该属植物中分得。     

紫玉盘化学成分的研究

目的：从紫玉盘Uvaria macrophylla var. microcarpa中分离具有抗癌活性成分。方法：用色谱方法分离紫玉盘中化学成分,用波谱技术（IR,ESI-MS,1H-NMR,13C-NMR,HMQC,COSY,HMBC, NOESY)进行鉴定结构。结果：从紫玉盘中分离得到4个化合物, uvarimacrins A （1）, B（2）and C（4）和uvamalols D（3）。结论：化合物（1）,（2）,（4）均为新化合物,（3）首次从紫玉盘中分离得到。     

Rare sesquiterpenes from the algicolous fungus Drechslera dematioidea

From the inner tissue of the marine red alga Liagora viscida the fungus Drechslera dematioidea was isolated. After mass cultivation, the fungus was investigated for its secondary metabolite content, and 10 new sesquiterpenoids [isosativenetriol (1), drechslerines A (2) and B (3), 9-hydroxyhelminthosporol (5), drechslerines C-G (6-10), and sativene epoxide (12)] were isolated. Compounds 8 and 10 exhibited antiplasmodial activity against Plasmodium falciparum strains K1 and NF54. The known compounds helminthosporol (4), cis-sativenediol (11), isocochlioquinone A (14), isocochlioquinone C (15), and cochlioquinone B (16) were also isolated. All structures were elucidated using spectroscopic methods, mainly 1D and 2D NMR and MS.