地胆草倍半萜内酯化合物的结构修饰

为寻找毒性低、活性强的化合物，对地胆草倍半萜内酯化合物进行结构修饰。本文首先从地胆草全草中分离得到去氧地胆草内酯(deoxyelephantopin)和地胆草种内酯(scabertopin)，再对这两个化合物进行氧化和氢化反应，制备不同结构修饰产物。共得到5个大环化合物，通过IR、 ¹H NMR和MS等方法确定其结构。其中4个化合物(2～5)为新化合物，部分化合物有一定的抗肿瘤活性。     

地胆草中新的细胞毒成分

地胆草属植物以其含有细胞毒成分地胆草素(elephantopin)衍生物而闻名。印度和斯里兰卡的研究表明,地胆草含去氧地胆草素、异去氧地胆草素、11,13-二氢去氧地胆草素,还有其它一些三萜类化合物。地胆草根的乙醇提取物的水溶部分,以氯仿抽提。氯仿提取部位对肽酶(如肽酶Ⅳ,脯氨酸-肽链内切酶工具)有明显抑制作用。浓缩的水提部分经柱层析,再经硅胶制备型TLC,分得愈创木内酯A、B和C_0A为去酰菜蓟苦素(deacylcya-natopicrin)。C为葡糖中美菊素(glucozaluzanin)。它是首次从自然界中分离     

菖蒲的化学成分研究概况

菖蒲为较常用中药,具有多种药理及生理作用．含有单萜、倍半萜、苯丙素等挥发油成分及黄酮、醌、生物碱、胆碱、有机酸、氨基酸、糖等非挥发性成分．本文就此对两种菖蒲———石菖蒲和水菖蒲的化学成分研究状况作一综述．以对其进行全面的研究与开发     

从姜精油中快速分离姜烯

最近研究证实,姜烯具有多种生物活性,如抗病毒、抗溃疡和抗生育等,广泛用于化妆品和香料工业。姜烯为姜精油中主要成分,通常很难从姜精油中的倍半萜混合物中分离精     

美尔瑞^R

主要成分 本品为灯盏细辛浸膏。主要含黄酮、吡喃酮、焦呋康酸、倍半萜和咖啡脂等10多种化合物，黄酮是其主要成分。     

海葵目动物化学成分及生物活性的研究概况

从海葵目动物中分离出许多化学成分，包括多种多样结构新颖的肽类化合物及倍半萜，类脂等成分，许多具有独特的生物活性，本文对其中代表性的化学成分及其生物活性进行了概述并提出研究展望。     

地胆草提取物对肝癌血管生成拟态的作用研究

目的 研究地胆草提取物对肝癌HepG2细胞增殖、迁移、血管生成拟态的作用和机制.方法 取对数生长期HepG2肝癌细胞,分为对照组(0.1％DMSO)和不同浓度实验组(地胆草提取物质量浓度分别为25,50,75,100,125,150μg·mL-1).以噻唑蓝(MTT)比色法测定地胆草提取物对HepG2细胞增殖的影响;根...     

白花前胡挥发油成分的研究

本文用气质联用首次对白花前胡挥发油成分进行了分离鉴定，证明其主要成分为香木兰烯，β－榄香烯等倍半萜成分，抗菌实验表明白花前胡挥发油对金黄色葡萄球菌的生长有较强的抑制作用。     

维药驱虫斑鸠菊化学成分、质量控制及其药理活性的研究进展

维药驱虫斑鸠菊为菊科斑鸠菊属植物驱虫斑鸠菊(Vernonia anthelmintica Willd.)的干燥成熟种子,是维吾尔族常用药材,主产于中国新疆和巴基斯坦等地。由于其对于白癜风等皮肤病的治疗有独特的疗效,近年来受到越来越多的关注。驱虫斑鸠菊中主要化学成分为倍半萜及其二聚体、黄酮、甾体等类成分。由于产地独特的地理环境和气候,形成了较为独特的化学成分,倍半萜类成分主要为榄香烷型,该类型倍半萜在菊科其他属中较为少见;并且大多数分离得到的倍半萜在8位上连接有较为少见的2-(羟甲基)丙烯酰基。驱虫斑鸠菊的质量控制及药理活性也有报道。本文对驱虫斑鸠菊的化学成分、质量控制及药理活性进行系统归纳整理,以期为该药材的开发利用提供参考。     

白花地胆草中一个新的吉玛烷型倍半萜

采用硅胶柱色谱、Sephadex LH-20柱色谱、MCI柱色谱及半制备高效液相色谱等技术手段从白花地胆草(Elephantopus tomentosus L.)全草95%乙醇提取物分离纯化得到15个化合物。依据其理化性质、光谱数据(UV、IR、NMR、MS和CD)等多种技术鉴定了化合物的结构,分别为白花地胆草内酯A (1)、柔毛地胆宁(2)、白花地胆草亭(3)、8-O-methacryloylelephanpane (4)、芹菜素(5)、苜蓿素(6)、原儿茶醛(7)、原儿茶酸甲酯(8)、咖啡酸甲酯(9)、咖啡酸乙酯(10)、(+)-(4S)-(2E)-4-羟基-2-壬烯酸(11)、E-4-羟基十六烷-2-烯酸(12)、3-吲哚甲酸(13)、3-吲哚甲醛(14)和异血红素酸(15)。其中,化合物1为新化合物,化合物5～15首次从白花地胆草中分离得到,并首次报道了化合物2的绝对构型。化合物1对小鼠胃癌细胞(SGC-7901)具有微弱的细胞毒活性。     

Hepatoprotection by Elephantopus scaber Linn. in CCl4-induced liver injury

The efficacy of the medicinal plant Elephantopus scaber Linn. (Asteraceae), to prevent carbon teterachloride (CCI4)-induced chronic liver dysfunction in the rats was examined by determining different biochemical markers in serum and tissues. In serum, liver function marker enzymes like aspartate aminotrasferase (AST), alanine aminotrasferase (ALT), alkaline phosphatase (ALP) and also protein were evaluated. The concentrations of total lipid, cholesterol and phospholipids were studied in serum and the different tissues. The concentration of serum triglycerides was also studied. The biochemical changes induced by CCI4 in different tissues particularly in the liver tissue improved following treatment with E. scaber Linn. The results suggest the hepatoprotective effect of this medicinal plant.     

Methodological Studies on Genomic DNA Extraction and Purification from Plant Drug Materials

本文探讨了菊科９种植物和地胆草的４种对口商品药材基因组ＤＮＡ提取与纯化的原理、方法通过对３种常用植物基因组ＤＮＡ提取方法（ＣｓＣｌ梯度超速离心法、ＣＴＡＢＣｓＣｌ梯度超速离心法和ＣＴＡＢ微量提取法）的条件摸索在ＤＮＡ产率、纯度以及提取纯化过程中影响ＰＣＲ扩增因子方面进行比较，认为ＣＴＡＢ微量提取法是植物类药材基因组ＤＮＡ一种比较省时、有效、经济的提取方法     

A new elemanolide sesquiterpene lactone from Elephantopus scaber

A new elemanolide sesquiterpene lactone, named elescaberin (1), together with two known compounds, namely, isodeoxyelephantopin (2) and deoxyelephantopin (3), was isolated from the whole plant of Elephantopus scaber. The structure of 1 was elucidated on the basis of spectroscopic analysis. All three compounds exhibited significant inhibitory activities against human SMMC-7721 liver cancer cells in vitro (IC(50) 8.18-14.08 micromol/l).     

HPLC法测定地胆草中4,5-二咖啡酰奎宁酸的含量

目的：建立高效液相色谱法测定地胆草中4,5-二咖啡酰奎宁酸含量的方法。方法：色谱柱为AgilentSBC．。柱（250mm×4．6mm,5μm）,流动相为乙腈．0．1％磷酸溶液（17：83）;流速为1．0ml·min-1;检测波长为327nm;柱温为30℃,进样量10μl。结果：4,5-二咖啡酰奎宁酸在0．0235—2．3520txg范围内线性关系良好（r=0．9999）,平均加样回收率为98．75％,RSD为1．24％（n=6）。结论：所用方法简便、快速、准确,可作为测定地胆草中4,5-二咖啡酰奎宁酸含量的方法。     

A new sesquiterpene lactone from Elephantopus tomentosus

A new sesquiterpene lactone, named tomenphantopin H (1), together with two known germacranolides, 2β-methoxy-2-deethoxy-8-O-deacylphantomolin-8-O-tiglinate (2) and 2-deethoxy-2-hydroxyphantomolin (3), was isolated from the whole plant of Elephantopus tomentosus Linn. The new compound was completely elucidated using a combination of 1D and 2D NMR techniques (COSY, HMQC, and HMBC) and HR-ESI-MS analyses. All compounds exhibited antibacterial activity.     

Antiviral dicaffeoyl derivatives from Elephantopus scaber

A new dicaffeoyl derivative, 1α,2β-O-dicaffeoylcyclopentan-3β-ol (1), along with four dicaffeoylquinic acids (2–5), was isolated from the rhizomes of Elephantopus scaber Linn. The structure of the new compound was elucidated on the basis of extensive spectroscopic analyses. The in vitro antiviral activity against respiratory syncytial virus (RSV) of these dicaffeoyl derivatives was evaluated by cytopathic effect reduction assay, and all of them displayed more potent anti-RSV activity than ribavirin, the positive control drug.     

A new sesquiterpene lactone from Elephantopus tomentosus

A new sesquiterpene lactone, named tomenphantopin H (1), together with two known germacranolides, 2β-methoxy-2-deethoxy-8-O-deacylphantomolin-8-O-tiglinate (2) and 2-deethoxy-2-hydroxyphantomolin (3), was isolated from the whole plant of Elephantopus tomentosus Linn. The new compound was completely elucidated using a combination of 1D and 2D NMR techniques (COSY, HMQC, and HMBC) and HR-ESI-MS analyses. All compounds exhibited antibacterial activity.     

New sesquiterpene lactones from Elephantopus mollis and their leishmanicidal activities

The leishmanicidal compounds isolated from whole plants of Elephantopus mollis H.B.K. were identified as follows. Three new sesquiterpenoid lactones, 2,5-epoxy-2beta-hydroxy-8alpha-(2-methylpropenoyloxy)-4(15),10(14),11(13)-germacratrien-12,6alpha-olide, (4betaH)-8alpha-(2-methylpropenoyloxy)-2-oxo-1(5),10(14), 11(13)-guaiatrien-12,6alpha-olide and (4betaH)-5alpha-hydroxy-8alpha-(2-methylpropenoyloxy)-1(10),11(13)-guaiadiene-12,6alpha-olide, were isolated from Peruvian and Brazilian collections together with four known sesquiterpenoids, molephantin, elephantopin, isoelephantopin and 2-deethoxy-2beta-methoxyphantomolin. They exhibited potent in vitro leishmanicidal activities against Leishmania major. The alpha-methylene-gamma-butyrolactone moiety was found to be essential to the potent leishmanicidal effect observed.     

黄花稔属化学成分与药理作用研究进展

黄花稔属SidaLinn.植物含有甾醇类、生物碱类等多种化学成分。该属的多种植物作为传统中药广泛用于治疗哮喘、肾炎、感冒、发烧、头痛、溃疡等。在国外,用该属植物黄花稔Sida acuta Burm.f.治疗疟疾。对其有效成分白叶藤碱(cryptolepine)进行了较深入的研究,认为该成分有抗炎、抗疟、抗肿瘤、降血糖等作用。国内对拔毒散S.szechuensis Matsuda的地上部分进行了化学成分研究,从中提取、分离到8个甾醇类化合物、1个甾体皂苷、1个黄酮苷、1个单萜、1个吲哚类生物碱,并对其乙醇提取物做了抗菌实验。综述了该属植物化学成分和药理活性研究概况,为进一步开发、利用该属植物资源提供参考。