HPLC测定大风艾中5种二氢黄酮类成分的含量

目的 测定大风艾药材中3,3',5,7-四羟基-4'-甲氧基二氢黄酮、3',5,5',7-四羟基二氢黄酮、3,3',4',5-四羟基-7-甲氧基二氢黄酮、3,3',5-三羟基-4',7-二甲氧基二氢黄酮、艾纳香素5种二氢黄酮类成分的含量.方法 采用高效液相色谱法测定,色谱柱为AKZONOBEL Kromasil 100...     

桑白皮黄酮化学成分的研究

目的分离并鉴定桑白皮Morus alba L.丙酮提取物的化学成分.方法利用各种色谱方法进行分离纯化,根据理化性质和光谱数据进行结构鉴定.结果得到4个化合物,分别鉴定为2',4',5-三羟基-3-(y,y,γ-羟基-二甲基)丙基-2″,2″-二甲基吡喃-5″,6″:6,7-黄酮(1,morusignin L)、6,4'-二甲氧基-5,7,3'-三羟基异黄酮(2)、7-甲氧基-5,4'-二羟基二氢黄酮醇(3)、6-甲氧基-5,7,4'-三羟基异黄酮(4).结论化合物2、3、4为首次从该植物中分离得到.     

差不嘎蒿化学成分的分离与鉴定

目的研究差不嘎蒿的化学成分。方法利用硅胶柱色谱、葡聚糖凝胶等方法对差不嘎蒿的化学成分进行分离纯化,根据其理化性质和波谱数据鉴定化合物的结构。结果从差不嘎蒿中分离得到10个化合物,分别为5-羟基-7,4'-二甲氧基二氢黄酮(5-hydroxy-7,4'-dimethoxyflavanone,1)、3,5-二羟基-7,4'-二甲氧基二氢黄酮(3,5-dihydroxy-7,4'-dimethoxyflavanone,2)、异野樱素(isosakuranetin,3)、7-羟基-5,6-二甲氧基香豆素(umckalin,4)、5,7-二羟基-3,3',4'-三甲氧基黄酮(5,7-dihydroxy-3,3',4'-trimethoxyflavone,5)、5-羟基-6,7-二甲氧基香豆素(tomentin,6)、山奈酚-4'-O-甲醚(Kaempferol-4'-O-methylether,7)、泽兰黄素(eupatrin,8)、β-谷甾醇(β-sitosterol,9)、二氢槲皮素-4'-甲醚(taxifolin-4'-methylether,10)。结论化合物4、5、7、8、10为首次从该属植物中分离得到。     

显脉羊蹄甲的生物活性成分

目的对显脉羊蹄甲中具有抑制血小板聚集活性的有效部位的化学成分进行研究。方法从显脉羊蹄甲抑制血小板聚集活性部位中,利用溶剂分步萃取法和各种色谱手段(硅胶吸附柱色谱,聚酰胺柱色谱,Sephadex LH-20柱色谱,开放ODS柱色谱,液相色谱等)分离得到了10个化合物,根据其理化性质和光谱数据分析(1H-NMR、13C-NMR等)鉴定了它们的结构。结果从活性部位中分离鉴定的化合物为黄酮类,分别是:3,5,7,4'-四羟基-3'-甲氧基黄酮(3,5,7,4'-tetrahydroxy-3'-methoxyflavone,1)、5,7,3',4'-四羟基-3-甲氧基黄酮(5,7,3',4'-tetrahydroxy-3-methoxyflavone,2)、槲皮素(quercetin,3)、木樨草素(luteolin,4)、山柰酚(kaempferol,5)、5,7,4'-三羟基-3'-甲氧基黄酮(5,7,4'-trihydroxy-3'-methoxyflavone,6)、7,3',4'-三羟基-3-甲氧基黄酮(7,3',4'-trihydroxy-3-methoxyflavone,7)、杨梅苷(myricitrin,8)、槲皮素-3-O-α-L-吡喃阿拉伯糖苷(quercetin-3-O-α-Larabinopyranoside,9)、儿茶素(catechin,10)。结论化合物1-6、8-9均为首次从该植物中分离得到,化合物7为首次从羊蹄甲属植物中分离得到。     

马蔺根的化学成分研究

从鸢尾科植物马蔺根70%乙醇提取液中分离鉴定了11个已知化合物,分别为:5,7,3'-三羟基-4'-甲氧基黄酮(5,7,3'-Trihydroxy-4'-methoxyflavone,1),3、6、7-四羟基口山酮-2-C-β-D-葡萄糖(mangiferin,2),5-羟基-7,4'-二甲氧基黄酮-6-C-β-D-葡萄糖-2-O-L-鼠李糖(embinin,3),1-β-D-arabinofuranosyluracil(4),hyperolactone B(5),香草酸(6),2-methyl-propyl-β-D-ucopyranoside(7),decanoic acid(8),4-methylpentanoic acid(9),胡萝卜苷(10),β-谷甾醇(11).其中化合物1、4、5、7、8、9为首次从该植物中分离得到.     

黄杞叶黄酮类成分的研究

目的 研究黄杞叶中的黄酮类成分。方法 综合采用硅胶、Sephadex LH-20柱色谱及制备型高效液相色谱法,对黄杞叶中的黄酮类成分进行分离纯化,根据理化性质并结合UV、HPLC/Q-TOF-ESI-MS、1H-NMR、13C-NMR、DEPT、HMBC数据及文献进行结构鉴定。结果 分得了6个化合物,分别鉴定为落新妇苷(化合物Ⅰ)、黄杞苷(化合物Ⅱ)、槲皮苷(化合物Ⅲ)、(2R, 3R)5, 7, 3', 4'-四羟基二氢黄酮-3-氧-α-L-鼠李糖(3→1)-β-D-葡萄糖苷(化合物Ⅳ)、(2R, 3R)5, 7, 4'-三羟基二氢黄酮-3-氧-α-L-鼠李糖(3→1)-β-D-葡萄糖苷(化合物Ⅴ)、(2R, 3R)-5, 7, 4', 5'-四羟基二氢黄酮-3-氧-(3"-氧-没食子酰基)-α-L-鼠李糖苷(化合物Ⅵ)。结论 化合物Ⅴ为首次从该植物中得到,也是新化合物。     

毛枝卷柏黄酮类成分的研究

目的对毛枝卷柏黄酮类化学成分进行系统研究。方法采用正相硅胶柱、Sephadex LH-20柱色谱以及半制备高效液相色谱等分离纯化方法,根据化合物的理化性质和光谱方法鉴定其结构。结果从毛枝卷柏70%乙醇提取物中分离得到5个化合物,分别鉴定为:4'-甲氧基穗花杉双黄酮(1)、穗花杉双黄酮(2)、7,4',7',4'-四甲氧基穗花杉双黄酮(3)、橡胶树双黄酮(4)和2,6,8-三甲基-5,7-二羟基色原酮(5)。结论化合物1~5均首次从毛枝卷柏中分离得到。     

胡桃楸青果皮化学成分研究

目的研究胡桃楸青果皮的化学成分。方法利用硅胶柱色谱,重结晶,sephadex LH-20柱色谱等分离技术进行系统分离纯化,根据理化性质及光谱数据鉴定结构。结果从胡桃楸青果皮乙醇提取物的乙酸乙酯部分中分离得到了10个化合物,分别为汉黄芩素(1)、山姜素(2)、5-羟基-6,7-二甲氧基二氢黄酮(3)、5-羟基-7,8-二甲氧基二氢黄酮(4)、球松素(5)、3-甲氧基-4-羟基苯甲酸乙酯(6)、3,4-二羟基苯甲酸乙酯(7)、邻苯二甲酸二丁酯(8)、胡萝卜苷(9)、β-谷甾醇(10)。结论其中化合物1～8均为首次从胡桃属植物中分离得到。     

滇产干花豆中的两个新黄酮

目的研究滇产干花豆(Fordia cauliflora Hemsl)茎的化学成分。方法采用反复硅胶柱色谱进行分离纯化,根据光谱数据和理化性质进行结构鉴定。结果从干花豆乙醇提取物中分离得到6个化合物,分别鉴定为6-羟基-3-甲氧基-6″,6″-二甲基吡喃(2″,3″∶7,8)黄酮(1),3-甲氧基-6-(3-甲基-2-丁烯氧基)-6″,6″-二甲基吡喃(2″,3″∶7,8)黄酮(2),3,6-二甲氧基-6″,6″-二甲基吡喃(2″,3″∶7,8)黄酮(3),7-羟基-4′-甲氧基异黄酮(4),7,4′-二羟基异黄酮(5)和水黄皮素(6)。结论化合物1和2为新化合物,化合物3～5为首次从该植物中分离得到。     

中间锦鸡儿黄酮类成分的研究

目的研究中间锦鸡儿的化学成分。方法用溶剂法、色谱法分离化学成分，用波谱法鉴定其结构。结果从中间锦鸡儿中分离得到10个黄酮类化合物，分别鉴定为5,7,4′-三羟基-3,3′-二甲氧基黄酮(1)，3,5,7,8,4′-五羟基-3′-甲氧基黄酮(2),槲皮素(3),柠檬黄酮醇(4),槲皮素-3-甲醚(5)，2(S)-7,3′,5′-三羟基二氢黄酮(6)，5,7,3′,4′-四羟基-3,8-二甲氧基黄酮(7),紫铆查尔酮（8）,甘草素（9）和5,7,4′-三羟基-3,8二甲氧基黄酮（10）。结论化合物6为新化合物，其余皆首次从中间锦鸡儿中分离得到。     

A new chromone from Ficus lyrata

A new chromone, named 5,6-dihydroxy-2-methylchromone (FL-2), along with seven known flavonoids, 5-hydroxy-7,3,3',4'-tetramethoxyflavone (FL-3), 5,4'-dihydroxy-6,7,8-trimethoxyflavone (FL-4), 5,4'-dihydroxy-7,8-dimethoxyflavone (FL-5), 4-methoxychalcone (FL-6), 7,4'-dimethoxyapigenin (FL-7), 5,7,4'-trihydroxy-2',3',6'-trimethoxyisoflavone (FL-8 a rare flavonoid), acacetin-7-O-glucoside (FL-9) and acacetin-7-O-neohesperidoside (FL-10), and beta-sitosterol-D-glucoside (FL-1) have been isolated from the leaves of Ficus lyrata. Their structures have been established on the basis of chemical and spectral evidence (IR, UV, 1H NMR, 13C NMR and mass spectra).     

Antiproliferative constituents in plants 10. Flavones from the leaves of Lantana montevidensis Briq. and consideration of structure-activity relationship

The flavonoid fraction from the leaves of Lantana montevidensis Briq. (Verbenaceae) showed antiproliferative activity against human gastric adenocarcinoma (MK-1, GI50: 12 microg/ml), human uterus carcinoma (HeLa, 5 microg/ml), and murine melanoma (B16F10, 5 microg/ml) cells in vitro. Bioactivity-guided chemical investigation of the fraction has resulted in the isolation of apigenin (10) and ten 5,6,7-oxygenated flavones: cirsilineol (1), eupatorin (2), 5,4'-dihydroxy-6,7,3',5'-tetramethoxyflavone (3), 5,6-dihydroxy-7,3',4'-trimethoxyflavone (4), 5,6,4'-trihydroxy-7,3',5'-trimethoxyflavone (5), 5,6,3'-trihydroxy-7,4'-dimethoxyflavone (6), 5,3',4'-trihydroxy-6,7,5'-trimethoxyflavone (7), cirsiliol (8), hispidulin (9), and eupafolin (11). Antiproliferative activity of the isolated flavones, some other related flavones (luteolin, baicalein, 6-hydroxyluteolin, pectolinarigenin, jaceosidin, desmethoxycentaureidin, eupatilin, and chrysin) from other plant materials, and synthetic 6- and 7-methoxyflavones was evaluated, and the structure-activity relationships were examined.     

Highly Methylated 6-Hydroxyflavones and Other Flavonoids from Thymus piperella

From the aerial parts of THYMUS PIPERELLA, the free flavone aglycones 5,6-dihydroxy-7,8,4'-trimethoxyflavone ( 1), 5,6-dihydroxy-7,8,3',4'-tetramethoxyflavone ( 2), 5,6-dihydroxy-7,3',4'-trimethoxyflavone ( 3), ladanein ( 4) (5,6-dihydroxy-7,4'-dimethoxy-flavone), 5-hydroxy-7,4'-dimethoxyflavone ( 5) and apigenin ( 6), the flavanones naringenin ( 7) and eriodictyol ( 8), and the flavone glycosides vicenin-2 ( 9), apigenin-7- O-beta- D-glucoside (10) and luteolin-7- O-beta- D-glucoside ( 11), have been isolated and identified. This is the first time that 5,6-dihydroxy-7,8,4'-trimethoxyflavone has been found as a natural product.     

Phytochemical investigation of Anaphalis lactea

Four new compounds, 2',6'-dihydroxy-3'-(2-hydroxy-3-methyl-3-butenyl)-4'-methoxychalcone ( 1), 4,6-dihydroxy-7-isobutyryl-5-prenyl-2(3 H)-benzofuranone ( 4), 7- O-(beta- D-glucopyranosyloxy)-5-hydroxy-1(3 H)-isobenzofuranone ( 6) and (2 R,3 S)-3-methyl-2-(5-oxo-2-isopropenylhexyl)-cyclopentanone ( 7), along with thirteen known compounds were isolated from the whole plant of Anaphalis lactea. Their structures were established based on spectroscopic methods including IR, UV, MS, CD, 1 D NMR and 2 D NMR techniques. Compounds 2, 4 - 6 and 8 - 16 were tested for free-radical scavenging properties in the DPPH assays.     

Flavonoids and stilbenoids with COX-1 and COX-2 inhibitory activity from Dracaena loureiri

Fom the stem wood of Dracaena loureiri, a new homoisoflavanone named loureiriol (1) and eight known flavonoid and stilbenoid derivatives, including 5,7-dihydroxy-3-(4-hydroxybenzyl)-4-chromanone (2), 4,4'-dihydroxy-2,6-dimethoxydihydrochalcone (3), 2,4'-dihydroxy-4,6-dimethoxydihydrochalcone (4), 4'-hydroxy-2,4,6-trimethoxydihydrochalcone (5), 4,6,4'-trihydroxy-2-methoxydihydrochalcone (6), 4,3',5'-trihydroxystilbene (7), 4,3'-dihydroxy-5'-methoxystilbene (8) and 4-hydroxy-3',5'-dimethoxystilbene (9) were isolated. These compounds were evaluated for their inhibitory activity against the enzymes cyclooxygenase-1 and cyclooxygenase-2. Potent but non-selective activity was found for the stilbenoids 7-9 (IC(50) 1.29 - 4.92 microM) whereas weak or no activity was observed for the flavonoids 1-6.     

Methylated Flavones from Teucrium polium

The following four methylated flavones were obtained from the leaves of TEUCRIUM POLIUM L. (Labiatae). 4', 5-dihydroxy-6,7-dimethoxyflavone (cirsimaritin); 3', 5 dihydroxy-4',6,7-trimethoxyflavone (eupatorin); 5-hydroxy-4',7-dimethoxyflavone (apigenin-4', 7-dimethylether); 4', 5, 3'-trihydroxy-6,7-dimethoxyflavone (cirsiliol). One of these (4', 5-dihydroxy- 6,7-dimethoxyflavone) has been already reported in the same plant by Brieskorn and Biechele (1).     

Dihydrochalcones and benzoic acid derivatives from Piper dennisii

Two new dihydrochalcones (1, 2), as well as eight known compounds, piperaduncin C (3), 2',6'-dihydroxy-4'-methoxydihydrochalcone (4), 4,2',6'-trihydroxy-4'-methoxydihydrochalcone (5), 4-hydroxy-3,5-bis(3-methyl-2-butenyl)-benzoic acid (6), 3,5-bis(3-methyl-2-butenyl)-4-methoxybenzoic acid (7), 4-hydroxy-3-(3-methyl-2-butenoyl)-5-(3-methyl-2-butenyl)-benzoic acid (8), 2,2-dimethyl-8-(3-methyl-2-butenyl)-2H-1-chromene-6-carboxylic acid (9), and 3-(3',7'-dimethyl-2',6'-octadienyl)-4-methoxybenzoic acid (10) were isolated from the leaves of Piper dennisii Trelease (Piperaceae), using a bioassay-guided fractionation to determine their antileishmanial potential. Among them, compound 10 exhibited the best antileishmanial activity (IC50 = 20.8 μM) against axenic amastigote forms of Leishmania amazonensis, with low cytotoxicity on murine macrophages. In the intracellular macrophage-infected model, compound 10 proved to be more active (IC50 = 4.2 μM). The chemical structures of compounds 1-10 were established based on the analysis of the spectroscopic data.     

New dihydrochalcones and anti-platelet aggregation constituents from the leaves of Muntingia calabura

Two new dihydrochalcones, 2,3-dihydroxy-4,3',4',5'-tetramethoxydihydrochalcone (1) and 4,2',4'-trihydroxy-3'-methoxydihydrochalcone (2), and a new flavanone, (2R,3R)-(-)-3,5-dihydroxy-6,7-dimethoxyflavanone (3), together with nineteen known compounds have been isolated from the leaves of Muntingia calabura. The structures of three new compounds were determined through spectral analyses including extensive 2D-NMR data. Among the isolates, 2,3-dihydroxy-4,3',4',5'-tetramethoxydihydrochalcone, 5,7-dihydroxy-3-methoxyflavone, 5,7-dihydroxy-6-methoxyflavone, 5,4'-dihydroxy-3,7-dimethoxyflavone, (2S)-7,8,3',4',5'-pentamethoxyflavan, (2S)-5'-hydroxy-7,8,3',4'-tetramethoxyflavan, and methyl gallate exhibited significant anti-platelet aggregation activity in vitro.