首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
德钦红景天的化学成分   总被引:21,自引:1,他引:20  
从云南产德钦红景天Rhodiola atuntsuensis(Praeg.) Fu 的根及根茎中首次分离得到8 个化合物。根据各项光谱数据及化学反应鉴定其中一个新黄酮甙的结构为3 , 5 , 7 , 8 - 四羟基-黄酮4′- 氧- α- L- 鼠李糖吡喃甙, 命名为德钦红景天甙(rhodiolatuntoside, 2) , 另外7 个已知化合物分别是草质素- 8 - 甲醚(herbacetin - 8 - methylether,1) , 槲皮素(quercetin ,3) , 芦丁(rutin,4) , 酪醇(tyrosol,5) , 红景天甙(salidroside,6) , 没食子酸(gallic acid,7) 和β-谷甾醇( - sitosterol,8) 。  相似文献   

2.
喙果绞股蓝黄酮类化合物的分离及结构测定   总被引:5,自引:0,他引:5  
从喙果绞股蓝(Gynostemma yixingenseC.Y.WuetS.K.Chen.)的茎叶分离到7种化合物:喙果黄素(yixingensin)(I)、山奈酚(kaempferol)(I)、商陆素(ombuin)(Ⅲ)、商甙(om-buoside)(Ⅳ)、槲皮素(quercetin)(V)、异鼠李素(isorhamnetin)(Ⅵ)和硬脂酸(Ⅶ)。其中,喙果黄素为新的黄酮甙,通过光谱分析及化学反应鉴定为商陆素一3-O-β一D一葡萄糖成。  相似文献   

3.
红豆杉(Taxus chinensis (Pilger) Rehd.)中的非紫杉烷类化合物   总被引:6,自引:1,他引:5  
从红豆杉(Taxus chinensis(Pilger)Rehd.)树皮中分离到三个非萜类化合物,波同它们提吴茱次碱(rutaecarpine)(1)。山奈黄=-4'-甲醚(kaempferol-4'-methyl ether)(2)和谷甾醇(β-D-吡喃葡萄糖甙(sitosterryI-3-O-βglucoside)(3)。吴茱次碱是首次在红豆杉属植物中发现。  相似文献   

4.
藏玄参中的抑精三萜皂甙   总被引:1,自引:0,他引:1  
从藏药植物藏玄参(OreosolenwattiiHook.f.)的全草中分离到4个三萜皂甙,密蒙花甙(mimengoside)A和B及醉鱼草甙(buddlejasaponin)I和Ia,另外还得到阿克甙(acteoside)和6-羟基木犀草素-7-O-葡萄糖甙(6-hydroxyluteolin-7-O-glucoside)。体外抑精实验表明,4个三萜皂甙均有较强的抑精活性,其中密蒙花甙A和醉鱼草  相似文献   

5.
鞭打绣球中的苯丙素甙和环烯醚萜甙   总被引:6,自引:0,他引:6  
从鞭打绣球(HemiphragmaheterophyllumWall.)(玄参科)的全草中分离到2个新的苯丙素甙,命名为鞭打绣球甙A和B(hemiphrosideAandB),2个已知的苯丙素甙,plantamajoside和plantainosideD,以及3个已知的环烯醚萜甙,globularicisin,globularin和iso-scrophularioside.通过化学和光谱分析,鞭打绣球甙A和B的结构分别鉴定为2-(3-羟基-4-甲氧基苯基)乙基0-β-D-葡萄吡喃糖基(1→3)-4-O-反式阿魏醚基-β-D-葡萄吡喃糖试和2-(3,4-二羟基苯基)乙基O-[6-O-乙醚基-β-D-葡萄吡喃糖基(1→3)]-4-O-反式咖啡醚基-β-D-葡萄吡喃糖甙.  相似文献   

6.
从石竹科植物多荚草(Polycarpon prostratum(Forssk.)Aschers.et Schwein.ex Aschers)中分离得到3个新的柴胡皂甙类化合物:prostratoside A ̄C(1 ̄3)。它们的结构通过波谱方法分别鉴定为:3-O-{β-D-xylopyranosyl-(1→2)-β-D-glucopyranosyl-(1→4)-「β-D-glucopyranosy  相似文献   

7.
中药玄参的化学成分   总被引:8,自引:0,他引:8  
从中药玄参(ScrophularianingpoensisHemsl.)中分离得到1个新化合物:4-O-(对甲氧基肉桂酰基)-α-L-鼠李糖[4-O-(p-methoxycinnamoyl)-α-L-rhamnopyranose];同时还分离到4个已知的环烯醚萜甙:爪钧草甙(harpagide),爪钩草酯甙(harpagoside),O-甲基梓醇(O-methylcatalpol),士可玄参甙A(scropoliosideA)和1个已知的苯丙素甙:安格洛甙C(angorosideC)。新化合物的结构通过化学降解和光谱分析得到证明。  相似文献   

8.
云木香化学成分研究 II   总被引:7,自引:0,他引:7  
从丽江产云木香(SaussrealappaC.B.Clarke)根中分离得到的另外7化合物,它们分别是孕甾炮醇酮(pregnenolone)(1),β-谷甾醇(β-sitosterol)(2)葫萝卜甙(daucosterol)(3),苯丙素甙(syringin)(4),木质素甙(1-hydroxypinoresinol-1-β-D-glucopyranoside)(5)油酸(z,z)-9,12-o  相似文献   

9.
云木香化学成分研究Ⅱ   总被引:2,自引:1,他引:1  
从丽江产云木香(SausrealappaC.B.Clarke)根中分离得到的另外7个化合物,它们分别是_孕甾烯醇酮(pregnenolone)(1),β-谷甾醇(β-sitosterol)(2),葫萝卜甙(daucosterol)(3),苯丙素甙(syringin)(4),木质素甙(1-hydroxypinoresinol-1-β-D-glucopyranoside)(5),油酸[(z,z)-9,12-octadecadienoicacid](6)和油酸-1,3-甘油二酯[(z,z)-9,12-octadecadienoicacid-2-hydroxy-1,3-propanedinylester](7).它们的结构通过波谱和化学的方法得到鉴定。其中化合物1作为天然产物首次从植物中分离得到,化合物3,4,5和7为首次从该植物中分离得到。  相似文献   

10.
藏药黑边假龙胆的化学研究   总被引:8,自引:0,他引:8  
龙胆科植物黑边假龙胆(Gentianellaazurea(Bunge)Holub)是治疗肝胆湿热的1种藏药,从西藏日喀则产的全草中分离得到9个化合物,其中1个C一甙黄酮,异荭草素(isoorientin);1个山酮甙,獐牙菜酚甙(swertianolin);1个木质体甙,橄榄脂素4一O一β-D-葡萄糖甙(olivil4一O一β一glucoside);3个环烯醚萜甙,龙胆苦甙(gentiopicroside),獐牙菜甙(swertiamarin)和马钱子酸(loganicacid);1个三萜,齐敦果酸(loeanolicacid)1个甾醇,β谷甾醇葡萄糖甙(daucosterol)以及1个长链脂肪醇,三十烷醇(n一1一triacontanol)。它们的结构通过光谱和化学的方法得到了鉴定。上述结果,从次生代谢产物的角度为假龙胆属在系统分类上与龙胆属和獐牙菜属有着密切的联系提供了旁证。  相似文献   

11.
12.
13.
14.
15.
16.
17.
Some closely related members of the monocotyledonous familiesAlismataceae, Liliaceae, Juncaceae, Cyperaceae, Poaceae andAraceae with variable modes of pollination (insect- and wind-pollination) were studied in relation to the ultrastructure of pollenkitt and exine (amount, consistency and distribution of pollenkitt on the surface of pollen grains). The character syndromes of pollen cementing in entomophilous, anemophilous and intermediate (ambophilous or amphiphilous) monocotyledons are the same in principal as in dicotyledons. Comparing present with former results one can summarize: 1) The pollenkitt is always produced in the same manner by the anther tapetum in all angiosperm sub-classes. 2) The variable stickiness of entomophilous and anemophilous pollen always depends on the particular distribution and consistency of the pollenkitt, but not its amount on the pollen surface. 3) The mostly dry and powdery pollen of anemophilous plants always contains a variable amount of inactive pollenkitt in its exine cavities. 4) A step-by step change of the pollen cementing syndrome can be observed from entomophily towards anemophily. 5) From the omnipresence of pollenkitt in all wind-pollinated angiosperms studied one can conclude that the ancestors of anemophilous angiosperms probably have been zoophilous (i.e. entomophilous) throughout.
  相似文献   

18.
19.
正Dear Editor,Parainfluenza virus 5 (PIV5), known as canine parainfluenza virus in the veterinary field, is a negative-sense,nonsegmented, single-stranded RNA virus belonging to the Paramyxoviridae family (Chen 2018). The virus was first reported in primary monkey kidney cells in 1954 (Hsiung1972), then it has been frequently discovered in various  相似文献   

20.
<正>Dear Editor,Infectious bursal disease (IBD) is one of the most important diseases of the poultry. The IBD virus (IBDV), a nonenveloped virus belonging to the Birnaviridae family with a genome consisting of two segments of double-stranded RNA (segments A and B), targets B lymphocytes of bursa of Fabricious leading to immunosuppression. In Pakistan,poultry farming is the second biggest industry and IBD is the second biggest disease threating the poultry sector.However, there is limited genome information of IBDV  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号