高效液相色谱法测定罗汉茶中落新妇苷的含量

目的建立高效液相色谱测定药材罗汉茶中落新妇苷含量的方法。方法选用色谱柱为L ichrospher C-18(4.6 mm×250 mm,5μm);流动相为甲醇-0.3%醋酸水溶液(v/v,45∶55);检测波长291 nm;流速1.0 mL.m in-1;柱温25℃。结果落新妇苷进样量在0.182~1.093μg范围内与峰面积呈良好线性关系(r=0.9995,n=6);落新妇苷的加样回收率为98.60%(RSD=2.49%)。结论该法简便、准确、可靠,可用于罗汉茶药材的质量控制。     

Antitubercular cassane furanoditerpenoids from the roots of Caesalpinia pulcherrima

Activity-guided fractionation of a root extract of Caesalpinia pulcherrima led to the isolation of two cassane-furanoditerpenoids, 6 beta-benzoyl-7 beta-hydroxyvouacapen-5 alpha-ol (1) and 6 beta-cinnamoyl-7beta-hydroxyvouacapen-5 alpha-ol (2). Compound 2 showed strong antitubercular activity with a minimum inhibitory concentration (MIC) of 6.25 microg/mL, whereas the benzoyl analogue (1) was less active (MIC 25 microg/mL). Both compounds expressed moderate cytotoxic activity towards KB (human oral carcinonoid cancer), BC (human breast cancer) and NCl-H187 (small cell lung cancer) cell lines.     

Antitubercular constituents of Valeriana laxiflora

Antitubercular bioassay-guided fractionation of the n-hexane- and CH (2)Cl (2)-soluble extracts of the above-ground biomass and roots of Valeriana laxiflora led to the isolation of a new iridolactone, (4R,5R,7S,8S,9S)-7-hydroxy-8-hydroxymethyl-4-methyl-perhydrocyclopenta[ c]pyran-1-one ( 1), and a new lignan, (+)-1-hydroxy-2,6-bis- epi-pinoresinol ( 2), along with eleven known compounds, betulin ( 3), betulinic acid ( 4), 5,7-dihydroxy-3,6,4'-trimethoxyflavone ( 5), 23-hydroxyursolic acid ( 6), oleanolic acid ( 7), tricin ( 8), ursolic acid ( 9), ferulic acid, (+)-1-hydroxypinoresinol, prinsepiol, and 5,7,3'-trihydroxy-4'-methoxyflavone. The structures of compounds 1 and 2 were elucidated on the basis of spectroscopic evidence. The absolute stereochemistry of 1 was determined by chemical transformations and Mosher ester procedures. In a microplate alamar blue assay against Mycobacterium tuberculosis, compounds 2 - 9 exhibited minimum inhibitory concentrations (MIC) of 15.5 - 127 microg/mL, while the other isolates were regarded as inactive (MIC > 128 microg/mL). In addition, all the isolates were tested for cytotoxicity against African green monkey Vero cells in order to evaluate their selectivity potential.     

Three new triterpenes from the roots of Rhus javanica L. var. roxburghiana

Three new triterpenes, lantabetulal (1), lantanolal (2), and lantanolol (3) along with lantabetulic acid (4) and lantanolic acid (5) were isolated from the roots of Rhus javanica L. var. roxburghiana. The structural assignments of all these compounds were carried out by their spectroscopic analysis.     

Three new triterpenes from the roots of Rhus javanica L. var. roxburghiana

Three new triterpenes, lantabetulal (1), lantanolal (2), and lantanolol (3) along with lantabetulic acid (4) and lantanolic acid (5) were isolated from the roots of Rhus javanica L. var. roxburghiana. The structural assignments of all these compounds were carried out by their spectroscopic analysis.     

Antitubercular and antiplasmodial constituents of Abrus precatorius

A known isoflavanquinone, abruquinone B ( 1), and a new derivative, abruquinone G ( 2), were isolated from the aerial parts of Abrus precatorius. Chemical structures of these compounds were elucidated by spectral analyses. While 1 exhibited antitubercular, antiplasmodial and cytotoxic activities, compound 2 showed mild antiviral and cytotoxic activities.     

Cytotoxic constituents from the roots ofAnthriscus sylvestris

Activity-guided fractionation of the roots of Anthriscus sylvestris resulted in the isolation and characterization of five cytotoxic compounds, deoxypodophyllotoxin (1), falcarindiol (2), and angeloyl podophyllotoxin (5) from the hexane soluble fraction and morelensin (3), bursehernin (4) from the chloroform soluble fraction. It is the first report of the occurrence of compound 5 in nature.     

Three new triterpenes from the roots of Rhus javanica L. var. roxburghiana

Three new triterpenes, lantabetulal (1), lantanolal (2), and lantanolol (3) along with lantabetulic acid (4) and lantanolic acid (5) were isolated from the roots of Rhus javanica L. var. roxburghiana. The structural assignments of all these compounds were carried out by their spectroscopic analysis.     

Phenolic constituents from the roots of Phyllodium pulchellum

Three new phenolic constituents 1–3 were obtained from the 95% ethanol extract of the roots of Phyllodium pulchellum (Leguminosae). Their structures were elucidated on the basis of spectroscopic analyses, such as NMR, UV, IR, HR-ESI-MS, and CD. Furthermore, in an in vitro bioassay, all compounds were tested for inhibitory effects against the proliferation of acetaldehyde-stimulated HSC-T6 cells, and compound 3 exhibited potent inhibitory activity with the IC₅₀ value of 7.6 μM.     

Chemical constituents from the roots of Feroniella lucida

A new furanocoumarin named lucidafuranocoumarin A (7) together with 13 known coumarins (1–6, 8–14) and four known alkaloids (15–18) was isolated from the roots of Feroniella lucida. Their structures were elucidated on the basis of spectroscopic analysis. Some of the isolates were evaluated for their biological activities, and compound 18 showed strong cytotoxicity against KB (IC₅₀ = 0.637 μg/ml) and NCI-H187 (IC₅₀ = 0.094 μg/ml) human cancer cell lines, antimalarial activity against Plasmodium falciparum (IC₅₀ = 0.336 μg/ml), and antituberculosis activity against Mycobacterium tuberculosis (MIC = 6.25 μg/ml).     

九节菖蒲的化学成分

目的研究九节菖蒲Anemone altaicaFisch.ex C.A.May的化学成分。方法乙酸乙酯萃取部分通过硅胶柱色谱反复分离,根据光谱数据和理化性质确定各化合物的结构。结果分离并鉴定的5个化合物分别为肉桂酸、(2S,3S,4R,8E)-2-[(2′R)-2′-羟基二十四烷酰氨基]-1,3,4-三羟基-8-十八烷烯、原儿茶醛、aralia cerebroside和咖啡酸。结论所有化合物均为首次从本属植物中分得。     

Vasodilator constituents from the roots of Lysidice rhodostega

Two new phloroglucinol glycosides, lysidisides A and B, and two new flavanol ramifycations, lysidicichin and mopanolside, together with (+)-mopanol, polydatin and E-resveratrol 3-O-beta-D-xylopyranoside were isolated from the EtOAc extract of the roots of Lysidice rhodostega. The structures of the new compounds were elucidated on the basis of chemical and spectral evidence. Lysidisides A and B, (+)-mopanol and polydatin inhibited phenylepherine (Phe)-induced vasoconstriction in the rat aortic rings in the presences of indomethacin (Indo) and Nomega-L-nitroarginine (L-NA).     

Chemical constituents from the roots of Feroniella lucida

A new furanocoumarin named lucidafuranocoumarin A (7) together with 13 known coumarins (1-6, 8-14) and four known alkaloids (15-18) was isolated from the roots of Feroniella lucida. Their structures were elucidated on the basis of spectroscopic analysis. Some of the isolates were evaluated for their biological activities, and compound 18 showed strong cytotoxicity against KB (IC(50)?=?0.637?μg/ml) and NCI-H187 (IC(50)?=?0.094?μg/ml) human cancer cell lines, antimalarial activity against Plasmodium falciparum (IC(50)?=?0.336?μg/ml), and antituberculosis activity against Mycobacterium tuberculosis (MIC?=?6.25?μg/ml).     

Chemical constituents from the roots of Ranunculus ternatus

Two new glycosides named as ternatoside A (1) and ternatoside B (2), with four known constituents sternbin (3), methylparaben (4), 4-O-D-glucopyranosyl-p-coumaric acid (5) and linocaffein (6) were isolated from the roots of Ranunculus ternatus, The structures of new compounds were determined by 1D and 2D NMR, MS techniques, and chemical methods.     

Chemical constituents from the roots of Biondia chinensis

Two new triterpenoid saponins, biondianosides F and G, together with 13 known compounds, were isolated from the ethanolic extract of the roots of Biondiachinensis Schltr. (Asclepiadaceae). Their structures were characterized as 3-O-beta-D-glucopyranosyl-2alpha,3beta-dihydroxyurs-12-en-28-oic acid-beta-D-glucopyranosyl-(1-->2)-[beta-D-glucopyranosyl-(1-->6)]-beta-D-glucopyranosyl ester (biondianoside F) and 3-O-beta-D-glucopyranosyl-2alpha,3beta,23-trihydroxyolean-12-en-28-oic acid-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosyl ester (biondianoside G) by spectral and chemical evidence.     

Chemical constituents from the roots of Biondia chinensis

Two new triterpenoid saponins, biondianosides F and G, together with 13 known compounds, were isolated from the ethanolic extract of the roots of Biondia chinensis Schltr. (Asclepiadaceae). Their structures were characterized as 3-O-β-d-glucopyranosyl-2α,3β-dihydroxyurs-12-en-28-oic acid-β-d-glucopyranosyl-(1 → 2)-[β-d-glucopyranosyl-(1 → 6)]-β-d-glucopyranosyl ester (biondianoside F) (14) and 3-O-β-d-glucopyranosyl-2α,3β,23-trihydroxyolean-12-en-28-oic acid-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranosyl ester (biondianoside G) (15) by spectral and chemical evidence.     

穿心莲根的化学成分研究

为研究常用中药爵床科植物穿心莲(Andrographis paniculata)根的化学成分,运用各种色谱方法从安徽临泉产穿心莲根的80%乙醇提取物中分离并鉴定了28个化合物,其中20个黄酮:5,5'-二羟基-7,8,2'-三甲氧基黄酮(1)、5-羟基-7,8,2',6'-四甲氧基黄酮(2)、5,3'-dihydroxy-7,8,4',-trimethoxyflavone(3)、2'-羟基-5,7,8-三甲氧基黄酮(4)、5-羟基-7,8,2',3',4'-五甲氧基黄酮(6)、wightin(7)、5,2',6'-trihydroxy-7-methoxyflavone 2'-O-β-D-glucopyranoside(8)、5,7,8,2'-四甲氧基黄酮(10)、5-羟基-7,8-二甲氧基二氢黄酮(11)、5-羟基-7,8-二甲氧基黄酮(12)、5,2'-二羟基-7,8-二甲氧基黄酮(13)、5-羟基-7,8,2',5'-四甲氧基黄酮(14)、5-羟基-7,8,2',3'-四甲氧基黄酮(15)、5-羟基-7,8,2'-三甲氧基黄酮(16)、5,4'-二羟基-7,8,2',3'-四甲氧基黄酮(17)、二氢黄芩新...     

长毛籽远志根的化学成分研究

为长毛籽远志Polygala wattersii的质量控制和进一步的开发提供科学依据,我们对它的根进行了系统的化学成分研究。利用砖胶、SephadexLH-20、制备薄层色谱及半制备液相等多种色谱分离技术进行分离和纯化,应用El—MS、ESI—MS、1HNMR及13CNMR等现代波谱技术并与文献相对照等方法鉴定化合物的结构。共从长毛籽远志根中分离鉴定了23个化合物,包括11个[口山]酮类：1,3-二羟基[口山]酮（1）,1-羟基-3-甲氧基[口山]酮（2）,1,3-羟基-2-甲氧基[口山]酮（3）,1,3,7-三羟基-2-甲氧基[口山]酮（4）,1,3,6-三羟基-2,7-二甲氧基[口山]酮（5）,1,6,7-三羟基-2,3-二甲氧基[口山]酮（6）,1,7-二羟基-2,3-亚甲二氧基[口山]酮（7）,1,7-二甲氧基[口山]酮（8）,1,2,3-三甲氧基[口山]酮（9）,1-甲氧基-2,3-亚甲二氧基[口山]酮（10）,6-羟基-1-甲氧基-2,3-亚甲二氧基[口山]酮（11）;9个糖酯类：3＇-O-阿魏酰基-6-O-乙酰蔗糖（12）,arillatose B（13）,sibficoseA5（14）,sibricoseA6（1S）,3＇,6-二-O-芥子酰基蔗糖（16）,tenufolisideA（17）,3＇-O-3,4,5-三甲氧基肉桂酰基-6—O-对甲氧基苯甲酰基蔗糖（18）,glomeratoseA（19）,1-O--对香甄酰基葡萄糖（20）;两个三萜皂苷类：bayogenin-3—O-glucoside（21）和tenufolin（22）及1个苯丙素类：芥了酸（23）。其中,化合物2和12为首次从远志属中分离得到,除化合物16外其它所有化合物均为首次从该种植物中分离得到。     

浙贝母鳞茎化学成分的研究

目的 研究百合科贝母属浙贝母Fritillaria thunbergii Miq.干燥鳞茎的化学成分.方法 运用硅胶柱色谱、C18反向柱色谱、Sephadex LH-20柱色谱对浙贝母的化学成分进行分离纯化,并结合理化性质和波谱数据鉴定其化学结构.结果 从浙贝母鳞茎提取物中分离得到了8个单体化合物,分别鉴定为:浙贝乙素...