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1.
连钱草化学成分研究   总被引:6,自引:2,他引:4  
从连钱草(Glechoma longituba)分离并鉴定了10个化合物,分别为β-谷甾醇(1)、齐敦果酸(2)、熊果酸(3)、2α,3α-二羟基乌苏-12-烯-28-酸(4)2、α,3β-二羟基乌苏-12-烯-28-酸(5)、胡萝卜苷(6),3,6-二甲氧基-6″,6″-二甲基苯并吡喃-(7,8,2″,3″)-黄酮(7)、芫花素(8)、芹菜素-7-O--βD-葡萄糖苷(9)、木犀草素-7-O-β-D-葡萄糖甙(10)。其中化合物2,4~8首次从该植物中分离得到。  相似文献   

2.
黄杨中的非生物碱化学成分   总被引:3,自引:0,他引:3  
从黄杨Buxus sinica地上部分分离出10个化合物,通过光谱分析鉴定为:Cleomiscosin A(1),3,5-二羟基-4′,6,7-三甲氧基-黄酮-3′-O-β-D-葡萄糖甙(2),5,3′,4′-三羟基-3,6,7-三甲氧基-黄酮(3),Cleomiscosin A-4′-O-β-D-glucopyranoside(4),3,5-二甲氧基苯甲酸-4-O-β-D-葡萄糖甙(5),4′,5-二羟基-3,6,7-三甲氧基-黄酮(6),羽扇豆烷醇(7),(+)-Pinoresinol-O-β-D-glucopyranoside(8),β-谷甾醇(9),胡萝卜甙(10)。其中化合物1—5,6,8均为首次从该属植物中分离得到。  相似文献   

3.
从珍珠菜(Lysimachia clethroidesDuby)的70%丙酮提取物中分离得到11个化合物,经理化性质及波谱数据分析分别鉴定为23-羟基乌苏酸(1)、Isotachioside(2)、对羟基苯甲酸(3)、3-甲氧基-4-羟基苯甲酸(4)、原儿茶酸(5)、3,5-二羟基苯甲酸(6)、甲基-α-D-呋喃果糖苷(7)、尿苷(8)、β-谷甾醇(9)、胡萝卜苷(10)和齐墩果酸(11)。化合物1、2、4、7和8为首次从该属植物中分离得到,化合物3、5、6、9~11为首次从该种植物中分离得到。  相似文献   

4.
酸藤子(Embelia laeta)化学成分的研究   总被引:6,自引:0,他引:6  
首次从紫金牛科酸藤子属植物酸藤子(Embelia laeta)醇提物中分离鉴定了10个已知化合物,通过波谱方法确定了它们的结构分别为2,6-二甲氧基苯醌(2,6-dimethoxybenzoquinone)(1);柠檬酸单甲酯(6-methyl citrate)(2);柠檬酸二甲酯(1,5-dimethyl citrate)(3);柠檬酸三甲酯(trimethyl dtrate)(4);没食子酸(gal1ic acid)(5),β-胡萝卜甙(β-daucosterol)(6);香草酸(vanillic acid)(7);3,5-二甲氧基-4-羟基苯甲酸(3,5-dimethoxy-4-hydroxybenzoic)(8);3,5-二羟基-4-甲氧基苯甲酸(3,5-dihydroxy-4-methoxybenzoic)(9)和β-谷甾醇(β-sitosterol)(10)。  相似文献   

5.
马比木根的化学成分研究   总被引:1,自引:0,他引:1  
通过硅胶、MCI和Sephadex LH-20反复柱层析、纯化,从马比木根的甲醇提取物中分离得到14个化合物,运用现代波谱技术鉴定为β-谷甾醇(1),β-胡萝卜苷(2),7-酮基-β-谷甾醇(3),β-sitosteryl-3-O-β-D-glucopyranoside-2'-O-palmitate(4),5α,6β-二羟基胡萝卜苷(5),羽扇豆醇(6),3-乙酰氧基-12-齐墩果烯-28醇(7),喜树碱(8),9-甲氧基喜树碱(9),10-羟基喜树碱(10),9-methoxy-mappicine-20-O-β-D-glucopyranoside(11),mappicine-20-O-β-D-glucopyranoside(12),(3S)-pumiloside(13),(-)-(3S)-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid(14)。化合物1~7、9~14为首次从该植物中分离得到。  相似文献   

6.
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   

7.
小叶黄杨化学成分的研究   总被引:2,自引:0,他引:2  
小叶黄杨氯仿组分通过硅胶柱色谱分离纯化,从中分离得到9个化合物,分别鉴定为:β-谷甾醇(β-Sitosterol,Ⅰ)、豆甾醇(Stigmasterol,Ⅱ)、胡萝卜甙(daucosterol,Ⅲ)、水杨酸(salicylis acid,Ⅳ)、香草酸(vanillicacid,Ⅴ)、5,4′-二羟基-3,3′,7-三甲氧基-黄酮(5,4′-dihydroxy-3,3′,7-trimethoxy-flavone,Ⅵ)、5,4′-二羟基-3,3′,6,7-四甲氧基-黄酮(5,4′-dihydroxy-3,3′,6,7-tetramethoxy-flavone,Ⅶ)、Cleomiscosin A(Ⅷ)、3,5-二羟基-4′,6,7-三甲氧基-黄酮-3′-O-β-D-葡萄糖甙(3,5-dihydroxl-4′,6,7-trimethoxyl-flavone-3′-O-β-D-glucopyranoside,Ⅸ),其中化合物Ⅳ、Ⅴ、Ⅵ、Ⅶ均首次从该属植物中分离得到。  相似文献   

8.
细穗玄参的脂溶性化学成分   总被引:3,自引:2,他引:1  
沈光明  田瑄 《西北植物学报》2004,24(7):1295-1297
从细穗玄参(Scrofella chinensis Maxim.)全草中分离并鉴定了8个化合物。利用光谱(MS、NMR、UV)和化学方法分别鉴定为5,7,3′-三羟基-4′-甲氧基黄酮(1)、3,5-二羟基-7,4′-二甲氧基黄酮(2)、5,6,7-三羟基-4′-甲氧基黄酮(3)、β-谷甾醇(4)、胡萝卜苷(5)、对甲氧基苯甲酸(6)、对苯酚(7)及二十九碳脂肪酸(8)。8个化合物均为首次从该植物中发现。  相似文献   

9.
从玉米须60%乙醇提取液中分离得到了14个化合物,经波谱学方法分别鉴定为柯伊利素-7-O-β-D-葡萄糖苷(1)、柯伊利素-6-C-β-波伊文糖-7-O-β-葡萄糖苷(2)、柯伊利素-6-C-β-波伊文糖苷(3)、L-鼠李糖(4)、豆甾-4-烯-3β,6β-二醇(5)、7α-羟基谷甾醇(6)、7β-羟基谷甾醇(7)、胡萝卜苷棕榈酸酯(8)、大豆脑苷I(9)、7α-羟基谷甾醇-3-O-β-D-葡萄糖苷(10)、麦角甾-7,22-二烯-3β,5α,6β-三醇(11)、棕榈酸(12)、胡萝卜苷(13)和β-谷甾醇(14),其中化合物1、4和7~12为首次从玉米须中分离得到。  相似文献   

10.
从牛大力(Millettia speciosa Champ.)茎95%乙醇提取物的乙酸乙酯部分分离得到了7个化合物,经波谱分析及与文献数据对照鉴定其结构为:4,2’,4’-三羟基查耳酮(1)、高丽槐素(2)、4’-羟基-7-甲氧基二氢黄酮(3)、谷甾-5-烯-3,7-二醇(4)、β-谷甾醇(5)、豆甾醇(6)和β-胡萝卜苷(7)。其中化合物3和4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   

16.
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   

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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   

19.
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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