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1.
鹿蹄草化学成分研究   总被引:1,自引:0,他引:1  
从鹿蹄草(Pyrola callianthaH.Andres)中分离得到11个化合物,经光谱分析确定其结构为(4R)-1-四氢萘酮(1),(4S)-1-四氢萘酮(2),夹竹桃麻素(3),没食子酸(4),3,4-二羟基苯甲酸(5),鹿蹄草素(6),5-羟甲基糠醛(7),金丝桃苷(8),2″-O-没食子酰基金丝桃苷(9),鹿蹄草苷B(10),4-羟基-2,7-二甲基萘基-1-O-β-D-吡喃葡萄糖苷(11)。其中化合物1,2,3,5,6,11为首次从该植物中分离得到,化合物7为首次从该属中分离得到。  相似文献   

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抱茎苦荬菜水溶性成分的分离与结构鉴定   总被引:3,自引:0,他引:3  
从抱茎苦荬菜的水溶性成分分离得到5个化合物,根据理化性质和光谱数据分别鉴定为木犀草素-7-O-β-D-葡萄糖醛酸苷(1),木犀草素-7-O-β-D-葡萄糖1→2葡萄糖苷(2),芹菜素-7-O-β-D-葡萄糖醛酸苷(3),菊苣酸(4),(-)3,4-二羟基咖啡酰基酒石酸(5)。化合物3~5为首次从该植物中分离得到。  相似文献   

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银中杨树叶化学成分研究   总被引:1,自引:0,他引:1  
采用硅胶柱色谱等分离方法,对银中杨Populus alba X P.berolinensis L.树叶的化学成分进行分离纯化,依据理化性质及波谱数据分析进行结构鉴定,从中分离鉴定了12个单体化合物,分别为:邻苯二酚(1),苯甲酸(2),水杨醇(3),东莨菪素(4),咖啡酸(5),水杨酸(6),2’-苯甲酰水杨苷(7),水杨苷(8),丁二酸(9),特里杨苷(10),3’-苯甲酰水杨苷(11)和6’-苯甲酰水杨苷(12),其中化合物3,4,7,9~12为首次从该植物中分离得到。  相似文献   

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从毛脉酸模根(Rumex gmelini Turcz.)75%乙醇提取物中分离得到1个新色原酮苷和5个已知化合物,应用波谱学方法及文献对照分别鉴定为2,5-dimethyl-7-hydroxychromone-7-O-β-glucopyranoside (1),nepodin-8-O-β-D-glucopyranoside (2),10-hydroxyaloin A (3),10-hydroxyaloin B (4),5-methoxyl-1(3H)-benzofuranone-7-O-β-D-glucopyranoside (5),phenylethyl-O-α-L-arabinopyranosy-(1→6)-O-β-D-glucopyranoside (6). 其中化合物1为新化合物,3~6首次从酸模属中分离得到,化合物2首次从该植物中分离得到.  相似文献   

5.
峨眉杠柳化学成分的研究   总被引:1,自引:0,他引:1  
从峨眉杠柳中分离得到7个化合物,通过波谱学等方法鉴定为熊果酸(1),( )-1-羟基松脂酚(2),23-羟基齐墩果酸(3),β-谷甾醇(4),27-羟基-α-香树脂醇(5),胡萝卜苷(6),杠柳苷(7).其中化合物1~7为首次从峨眉杠柳中分离鉴定.  相似文献   

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从黄檗落叶的95%乙醇提取物中分离鉴定了7个化合物,分别为phellodenol-A(1),茵芋苷(skimmin,2),phellodenol E(3),黄檗苷(amurensin,4),黄柏苷(phellamurin,5),(2R) -phellodensin-F(6)和clerosterol 3-Oβ-D-galactopyranoside (7).其中,化合物7为首次从黄柏属植物中分离得到,化合物3和6为首次从该植物中分离得到.  相似文献   

7.
目的:研究草珊瑚Sarcandra glabra的化学成分。方法:采用各种现代色谱技术对草珊瑚进行分离纯化,根据化合物的理化性质和光谱数据进行结构鉴定。结果:从草珊瑚全草中分离得到12个化合物,分别鉴定为:(-)-依斯坦布林A((-)-istanbulin A,1),依斯坦布林B(istanbulin B,2),菊苣苷(cichoriin,3),异秦皮啶(isofraxidin,4),滨蒿内酯(scoparone,5),槲皮素(quercetin,6),大黄素甲醚(physcion,7),大黄素(emodin,8),β-谷甾醇(β-sitosterol,9),东莨菪内酯(scopoletin,10),蜂花酸(melissicacid,11),正二十五烷醇(pentacosanol,12)。结论:化合物3、7、8、11、12均首次从该植物中分离得到,其中化合物3、11、12首次从该属植物中分离得到,化合物7首次从该科植物中分离得到。  相似文献   

8.
无梗五加果化学成分的研究   总被引:1,自引:0,他引:1  
从无梗五加(Acanthopanax sessiliflorus(Rupr.et Maxim.)Seem.)果70%乙醇提取物中分离鉴定了12个化合物.经波谱鉴定为东莨菪内酯(1),原儿茶酸甲酯(2),槲皮素(3),无梗五加苷B(4),金丝桃苷(5),(-)-pinoresinol-4,4'-di-O-β-D-glucopyranoside(6),chiisanoside(7),22a.hydroxyehiisanoside(8),niduloic acid(9),胡萝卜苷(10),东莨菪苷(11)和无梗五加苷D(12).其中化合物9为新天然产物,化合物1,2,6和11是首次从五加科植物中分离得到,化合物3是首次从五加属植物中分离得到.  相似文献   

9.
小叶石楠中苷类化学成分的研究   总被引:4,自引:2,他引:2  
从小叶石楠[Photinia parvifolia (Pritz.)Schneid]茎中分离得到10种化合物,利用波谱学方法分别鉴定为:(6′-O-palmitoly)-sitosterol-3-O-β-D-glucoside(1),isotachioside(2)、hexaacetate of (-)-lyoniresinol-3α-L-rhamnopyranoside(3a),koaburaside(4)、2,6-dimethoxy-4-hydroxyphenol-1-O-β-D-glucopyranoside(5),3-O-(β-D-glucopyranosyl)-1-(3′,5′-dimethoxy-4′-hydroxyphenyl)-1-propanone(6),di-O-methylcrenatin(7),L-threoguaiacylglycerol 8-O-β-glucopyranoside(8),苦杏仁苷(9),D-threo-guaiacylglycerol 8-O-β-glucopyranoside(10)。以上10个化合物均为首次从该属植物中分离得到。  相似文献   

10.
采用硅胶柱色谱、反相柱色谱、凝胶LH-20柱色谱、制备液相色谱等方法从中药玄参中分离得到15个化合物,并结合波谱数据及理化性质对其进行结构鉴定,分别鉴定为:哈巴俄苷(1)、哈巴苷(2)、益母草苷A(3)、6-O-甲基梓醇(4)、京尼平苷(5)、6-O-α-L-鼠李糖基桃叶珊瑚苷(6)、ningpogenin(7),甘草素(8),邻苯二甲酸二(2-乙基己)酯(9),麦芽糖(10),熊果酸(11),丙三醇(12),5-羟甲基糠醛(13),胡萝卜苷(14)及β-谷甾醇(15)。其中化合物3、6、8、9、10、12均为首次从该植物中分离得到。  相似文献   

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Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.  相似文献   

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Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.  相似文献   

17.
Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.  相似文献   

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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases  相似文献   

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