蔓生百部的化学成分研究

从蔓生百部(Stemona japonica)根中分离得到13个化合物,通过波谱数据,它们鉴定为β-谷甾醇(1)、豆甾醇(2)、5,11-豆甾二烯-3β-醇(3)、苯甲酸(4)、4-甲氧基苯甲酸(5)、1,8-二羟基-3-甲基蒽醌(6)、1,8-二羟基-6-甲氧基-3-甲基蒽醌(7)、氧代狭叶百部碱(8)、百部定碱(9)、异狭叶百部碱(10)、绿原酸(11)、栀子苷(12)和藏红花素A(13).所有化合物均为首次从该植物中分离得到.     

直立百部的非生物碱化学成分研究(英文)

从直立百部(Stemona sessilifolia)根中首次分离到十四个非生物碱成分.依据波谱数据,它们鉴定为豆甾醇(1)、4-甲氧基苯甲酸(2)、苯甲酸(3)、3,4-二甲氧基苯酚 (4)、4-甲氧基苯甲酸(5)、4-羟基苯甲酸(6)、4-羟基-3-甲氧基苯甲酸(7)、4-羟基-3,5-二甲氧基苯甲酸(8)、3,3′-bis(3,4-dihydro-4-hydroxy-6-methoxy)-2H-1-benzopyran(9)、4-羟基-3-甲氧基苯甲醛(10)、羽扇豆烷-3-酮 (11)、绿原酸(12)、胡萝卜苷(13),3-feruoyl-chinasueure (14).化合物5～14为首次从百部属植物中分离得到.     

蓍草化学成分研究

研究蓍草Achillea alpine L.全草的化学成分。采用大孔树脂、ODS、Sephadex LH-20凝胶柱色谱和pre-HPLC等方法分离与纯化,运用NMR、MS等波谱技术鉴定化合物结构。从蓍草95%乙醇提取物中分离得到16个化合物,分别是(2 E,4 E)-N-(2-methylbutyl)deca-2,4-dienamide(1)、墙草碱(2)、(E,E,Z)-2,4,8-decatrienoicacid isobutylamide-8,9-dehydropellitorine(3)、N-2′-methylbutyl-(E,E)-2,4-decadienam(4)、methyl-(E,E)-2,4,9-oxooctadeca-10,12-dienoate(5)、(S)-14-(E,E)-10,12-methyl 14-hydroxy-9-oxo-octadeca-10,12-dienoate(6)、(E,E)-2,4-undecadiene-8,10-diynamide-N-(2-methylpropyl)(7)、(E,E)-2,4-decadienoic acid p-hydroxyphenethylamide(8)、sinapyl alcohol diisovalerate(9)、(S)-13-hydroxyoctadeca-(Z,E)-9,11-dienoic acid(10)、(E,E)-2,4-decadienamide acid p-methoxyphenethylamide(11)、erythro-N-isobutyl-4,5-dihydroxy-2-(E)-decenamide(12)、3-O-阿魏酰-奎宁酸(13)、肉桂酸(14)、绿原酸(15)、3-O-咖啡酰-5-O-阿魏酰奎宁酸(16)。化合物1是一个新的酰胺类化合物;化合物4~6、9、10、12、13、16为首次从该属植物中分离得到;化合物8、11为首次从蓍草中分离得到。化合物1~11在四种不同的胃癌细胞株上进行细胞毒活性筛选,结果显示化合物2、5与9在50μM时对MGC-803细胞株具有较弱抑制活性,其抑制率依次为38.7%、34.7%、31.5%。     

麻楝果实化学成分及其抗烟草青枯病菌活性的研究

为研究麻楝(Chukrasia tabularis)的化学成分,采用色谱法从麻楝果实乙醇提取物中分离得到15个化合物,利用波谱学方法鉴定其结构分别为:没食子酸甲酯(1)、没食子酸乙酯(2)、没食子酸(3)、ozoroalide(4)、stigmast-4-en-6β-ol-3-one(5)、黄柏呈(6)、chukranin A(7)、chisopanin M(8)、21α,24α-methylmelianodiol(9)、toonaciliatin K(10)、21α,25-dimethylmelianodiol(11)、odoratone(12)、bourjotinolone A(13)、hispidone(14)和phragmalin di-isobutyrate(15)。化合物4~14为首次从麻楝属植物中分离得到。采用滤纸片琼脂扩散法对单体化合物进行抗烟草青枯病菌(Ralstonia solanacearum)的活性研究,结果表明化合物1、2和3具有中等拮抗活性。     

New Derivatives of Nonactic and Homononactic Acids from Bacillus pumilus Derived from Breynia fruticosa

Six new nonactic and homononactic acid derivatives, ethyl homononactate ( 1 ), ethyl nonactate ( 2 ), homononactyl homononactate ( 6 ), ethyl homononactyl nonactate ( 7 ), ethyl homononactyl homononactate ( 8 ), and ethyl nonactyl nonactate ( 9 ), as well as four known compounds, homononactic acid ( 3 ), nonactic acid ( 4 ), homononactyl nonactate ( 5 ), and bishomononactic acid ( 10 ), were isolated from culture broth of Bacillus pumilus derived from Breynia fruticosa. The structures of new compounds were elucidated by spectroscopic analysis and chemical methods. The optical purities of 1 – 6 were determined by HPLC/MS after treatment with L ‐phenylalanine methyl ester. The dimeric compounds 5 – 9 showed weak cytotoxic activities against five human cancer cell lines (IC₅₀ 19–100 μg/ml).     

银合欢豆荚中的酚类化学成分

为探讨银合欢(Leucaena leucocephala)的化学成分,从银合欢豆荚乙醇提取物中分离得到7个酚类化合物,经过波谱分析,鉴定为原儿茶酸乙酯(1)、丁香酸(2)、3-羟基-1-(3-甲氧基-4-羟基苯基)丙烷-1-酮(3)、咖啡酸甲酯(4)、(Z)-对香豆醛(5)、3-甲氧基-4-羟苯丙烷-7,8,9-三醇(6)、愈创木基甘油-8-O-4′-芥子醇醚(7)。所有化合物均为首次从该植物中分离得到。化合物1对大肠杆菌和鼠伤沙门氏菌有一定的抑制活性。     

无梗五加根中苯丙素类化合物的研究

从无梗五加(Acanthoparax sessiliflorus( Rupr.et Maxim.)Seem.)根70％乙醇提取物的乙酸乙酯层中提取分离得到8个苯丙素类化合物.经理化和波谱分析鉴定为(+)-表芝麻脂素(1)、(-)-芝麻脂素(2)、赛菊芋黄素(3)、洒维宁(4)、咖啡酸甲酯(5)、对羟基桂皮酸(6)、(-)-丁香脂素(7)、(+)-松脂索(8).化合物8是首次从五加科植物中分离得到,化合物1和5是首次从五加属植物中分离得到,化合物3、6和7是首次从该植物中分离得到.     

三叶蔓荆的化学成分研究

采用柱色谱方法,从三叶蔓荆全草(Vitex trifolia L.)95%乙醇提取物的石油醚和乙酸乙酯萃取部位分离得到12个化合物。经理化性质和波谱学方法鉴定为软脂酸(1)、对羟基苯甲酸(2)、对羟基苯甲酸乙酯(3)、3,4-二羟基苯甲酸(4)、香草酸(5)、咖啡酸(6)、顺式对羟基肉桂酸乙酯(7)、反式对羟基肉桂酸乙酯(8)、木犀草素(9)、槲皮素(10)、芹菜素(11)、齐墩果酸(12)。其中化合物3、6～11为首次从本植物分离得到,化合物3、6～8和11为首次从本属植物分离得到。     

Chemical constituents of Polygala tenuifolia roots and their inhibitory activity on lipopolysaccharide-induced nitric oxide production in BV2 microglia

A methanolic extract of the roots of Polygala tenuifolia (Polygalaceae) significantly attenuated nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated BV2 microglia cells. Five xanthones, 1-hydroxy-7-methoxyxanthone (1), 3,6-dihydroxy-1,2,7-trimethoxyxanthone (2), 1,3,6-trihydroxy-2,7-dimethoxyxanthone (3), 1,7-dihydroxy-2,3-dimethoxyxanthone (4) and 1,7-dihydroxy-3-methoxyxanthone (5), and five phenylpropanoids, 4-hydroxy-3-methoxypropiophenone (6), methyl 4-hydroxy-3-methoxycinnamic acid (7), 3,4,5-trimethoxycinnamic acid (8), 4-methoxycinnamic acid (9) and β-d-(3-O-sinapoyl) fructofuranosyl-α-d-(6-O-sinapoyl)glucopyranoside (10), were isolated from CHCl(3) fraction using bioactivity-guided fractionation. Among these compounds, compounds 1, 2, 4, 5 and 7 showed significant inhibitory effects on LPS-induced NO production in BV2 microglia cells at the concentration ranging from 10.0 to 100.0 μM.     

虫类中药蛴螬的酚性成分

从虫类中药蛴螬的乙酸乙酯提取物中分离得到6个化合物,其结构经波谱鉴定为3,5-二甲氧基-4-羟基苯甲酸(1),水杨酸(2),对羟基苯甲酸(3),香草酸(4),对羟基苯丙酸(5)和对羟基苯丙酸甲酯(6)。化合物1～6均为首次从该种动物药中分离得到。     

羊角拗茎的化学成分及其抗炎活性研究

探讨羊角拗茎的化学成分及其抗炎活性,采用硅胶、Sephadex LH-20等色谱分离技术分离纯化羊角拗茎乙醇提取物的乙酸乙酯萃取物中的化合物,通过质谱和核磁共振等波谱技术对其结构进行鉴定,确定出了13个化合物,包括常春藤皂苷元(1)、(-)-loliolide(2)、(3S,5R,6S,7E)-3,5,6-trihydroxy-7-megastigmen-9-one(3)、(3R,6R,7E)-3-hydroxy-4,7-megastigmadien-9-one(4)、松脂素(5)、表松脂素(6)、4,4′-dihydroxy-3,3′-dimethoxybenzophenone(7)、6-羟基柚皮素(8)、东莨菪素(9)、6-羟基-7,8-二甲氧基香豆素(10)、吲唑(11)、香草酸(12)、对羟基苯甲酸(13)。其中化合物1～4和6～13为首次从羊角拗中分离得到。采用LPS诱导小鼠单核巨噬细胞RAW 264.7体外细胞炎症模型测试结果表明,化合物5能显著抑制NO的产生,IC₅₀值为18.09±1.09μM。     

三丫苦的化学成分研究

采用硅胶柱层析从三丫苦的乙酸乙酯萃取物中分离得到6种化合物,经波谱分析鉴定为4,7-二甲氧基呋喃喹啉生物碱(1)、顺式-3,4,5-三羟基-6-乙酰基-7-甲氧基-2,2-二甲基色烷(2)、3-羟基-4-乙氧基-5,7-二甲氧基-6-乙酰-2,2-二甲基色烷(3)、3,5-二羟基-4-乙氧基-6-乙酰基-7-甲氧基-2,2-二甲基色烷(4)、异吴茱萸酮酚(5)和异吴茱萸酮酚甲醚(6)。所有化合物均首次从该植物的根部分离得到。     

Production of phenylacetic acid derivatives and 4-epiradicinol in culture by Curvularia lunata

Phenylacetic acid derivatives, methyl 2-acetyl-3,5-dihydroxyphenylacetate (1) and methyl 2-acetyl-5-hydroxy-3-methoxyphenylacetate (3); curvulin or ethyl 2-acetyl-3,5-dihydroxyphenylacetate (4), a known metabolite of Curvularia siddiqui, and 4-epiradicinol (5) have been isolated from the culture mycelia of Curvularia lunata grown on YMG, a medium consisting of yeast, malt extract and glucose. Compounds 1, 3 and 4 lack antimicrobial and antioxidant activity, but 4-epiradicinol (5) inhibited the growth of Escherichia coli, Staphylococcus aureus, Salmonella choleraesuis and Bacillus subtilis. The structures of compounds 1, 3-5 were determined by analyses of IR, MS, 1D and 2D NMR data, assisted by chemical shift comparison to related and model compounds. The relative stereochemistry of the vicinal diol in 5 was determined from the 1H NMR signals for the methyl protons of the resulting cyclic acetonide prepared from 5.     

Two novel C29-5beta-sterols from the stems of Opuntia dillenii

Two novel C29-5beta-sterols, opuntisterol [(24R)-24-ethyl-5beta-cholest-9-ene-6beta,12alpha-diol] (1) and opuntisteroside [(24R)-24-ethyl-6beta-[(beta-d-glucopyranosyl)oxy]-5beta-cholest-9-ene-12alpha-ol] (2), together with nine known compounds, beta-sitosterol (3), taraxerol (4), friedelin (5), methyl linoleate (6), 7-oxositosterol (7), 6beta-hydroxystigmast-4-ene-3-one (8), daucosterol (9), methyl eucomate (10) and eucomic acid (11), were isolated from the stems of Opuntia dillenii collected in Guizhou Province, China. Their structures were elucidated mainly by spectroscopic analysis. The absolute configuration of 1 were deduced from comparative 1H NMR data of the (S)- and (R)-methoxyphenyl acetate derivatives. Compounds 6-8, 10 and 11 were isolated from O. dillenii for the first time.     

天山棱子芹化学成分的研究

从天山棱子芹中首次分离得到15个已知化合物,通过NMR、MS及IR等波谱数据,分别鉴定为6,7-二羟基香豆素(1),( )-marmesin(2),marmesinin(3),5,7,4'-三羟基黄酮(4),莰非醇3-O-α-L-吡喃鼠李糖甙(5),藤黄菌素3'-O-β-D-吡喃葡萄糖甙(6),(R)-6-hydroxy-3-(2-hydroxypropan-2-yl)-6-methylcyclohex-2-enone(7),4-羟基苯甲酸(8),3-甲氧基4羟基苯甲酸(9),3-甲氧基-4,5-亚甲二氧基苯甲酸(10),丁香酸甲酯(11),丁香酸甲酯4-O-β-D-吡喃葡萄糖甙(12),姜油酮4’-O-β-D-吡喃葡萄糖甙(13),2-(4-羟基苯基)-乙醇(14)和正二十八醇(15)。其中化合物7为一新的天然产物。     

芒果核仁的化学成分及其抑菌活性

从杧果(Mangifera indica L.)果实核仁中分离得到6种化合物。经光谱分析及与文献对照,分别鉴定为没食子酸(1)、没食子酸甲酯(2)、没食子酸乙酯(3)、间-二没食子酸甲酯(4)、对羟基苯甲酸(5)和丁二酸单甲酯(6),它们均为首次从芒果核中获得。用琼脂平板稀释法测定了化合物1~5对7种细菌和4种真菌生长的抑制活性。结果表明,化合物1对金黄色葡萄球菌(Staphylococcus aureus)、表皮葡萄球菌(S. epidermidis)、干燥棒状杆菌(Corynebacterium xerosis)和藤黄微球菌(Micrococcus luteus)的最小抑制浓度(MIC)为50~100 µg mL-1,化合物4对绿脓杆菌(Pseudomonas aeruginosa)有抑制活性。     

一株地衣内生真菌Daldinia childiae的化学成分

本研究对分离自星点梅衣属地衣Punctelia sp.的一株内生真菌蔡氏轮层炭壳菌Daldinia childiae进行大米固体发酵培养,乙酸乙酯萃取发酵产物,采用硅胶柱色谱法、重结晶等方法分离纯化次生代谢产物,结合核磁共振波谱与质谱技术对单体化合物进行结构解析,运用DPPH法测定化合物的自由基清除能力.结果分离得到8...     

类芒齿黄芪地下部分化学成分研究

为了解类芒齿黄芪( Astragalus camptodontoides)主要化学成分,从其地下部分甲醇提取物的乙酸乙酯部位分离出19个单体化合物,通过现代波谱分析及理化性质等手段分别鉴定为异补骨脂黄酮(1),4′-hydroxy-isolonchocarpin (2),5-去氧山豆根黄酮(3),shinflavanone (4),khonklonginols H (5),4′-O-methylpreglabridin (6),3′-hydroxy-4′-O-methylglabridin (7),4′-O-methylglabridin (8),8-prenyl-phaseollinisoflavan (9),xambioona (10),光甘草酚(11),粗毛甘草素H (12),methylnissolin (13),邻苯二甲酸异丁酯(14),邻苯二甲酸丁酯异丁酯(15),β-谷甾醇(16),胡萝卜苷(17),齐墩果酸(18),(2S,3S,4R,9E)-1,3,4-trihydroxy-2-[(2′R)-2′- hydr-oxytetraco-sanoylamino]-9-octadecene (19)。化合物1~19均为首次从该植物中获得,化合物1~7为首次从黄芪属(Astraga-lus)植物中分离得到。     

Ceriopsins F and G,diterpenoids from Ceriops decandra

Chemical examination of the ethyl acetate solubles of the CH(3)OH:CH(2)Cl(2) (1:1) extract of the roots of Ceriops decandra collected from Kauvery estuary resulted in the isolation of two more diterpenoids, ceriopsins F and G (1-2) and five known compounds, ent-13-hydroxy-16-kauren-19-oic acid (steviol, 3), methyl ent-16beta,17-dihydroxy-9(11)-kauren-19-oate (4), ent-16beta,17-dihydroxy-9(11)-kauren-19-oic acid (5), ent-16-oxobeyeran-19-oic acid (isosteviol, 6), 8,15R-epoxypimaran-16-ol (7). The structures of the new diterpenoids were elucidated by a study of their physical and spectral data as methyl ent-13,17-epoxy-16-hydroxykauran-19-oate (1) and ent-16-oxobeyeran-19-al (2).     

Rare biscoumarins and a chlorogenic acid derivative from Erycibe obtusifolia

Three coumarins, 7,7'-dihydroxy-6,6'-dimethoxy-3,3'-biscoumarin (1), 7,7'-dihydroxy-6,6'-dimethoxy-8,8'-biscoumarin (2) and 7-O-[4'-O-(3',4'-dihydroxycinnamyl)-beta-d-glucopyranosyl]-6-methoxycoumarin (3), and a chlorogenic acid derivative, methyl-3-O-(4'-hydroxy-3',5'-dimethoxybenzoyl)-chlorogenate (4) were isolated from the roots of Erycibe obtusifolia along with four known coumarins, scopoletin (5), scopolin (6), cleomiscosin A (7) and cleomiscosin B (8). Their structures were elucidated by spectroscopic methods. Among them, compounds (1) and (2) are rare carbon-carbon linked symmetrical biscoumarins.