思茅豆腐柴中的黄酮类化学成分研究

 目的研究民族药物思茅豆腐柴(Premna szemaoensis Pei)中的黄酮类化学成分。方法利用Sephadex LH-20及硅胶等色谱技术进行分离纯化,根据理化性质、光谱数据进行结构鉴定。结果得到7个黄酮类化合物,分别鉴定为5,4'-二羟基- 3,7,3'-三甲氧基黄酮(1),5-羟基-3',4',6,7-四甲氧基黄酮(2),5,4'-二羟基-7-甲氧基黄酮醇(3),5,3'-二羟基-7,4'-二甲氧基黄酮醇(4),3',4',5-三羟基-3,7-二甲氧基黄酮(5),5,7-二羟基-4'-甲氧基黄酮(6),5-羟基-7,3',4'-三甲氧基黄酮醇(7)。结论这7个化合物均为首次从思茅豆腐柴中分离得到。     

艾纳香中的黄酮类化学成分

目的:研究艾纳香Blumea balsamifera中的黄酮类化学成分.方法:运用硅胶、Sephadex LH-20柱色谱对艾纳香中的化学成分进行分离,通过理化常数和波谱数据分析鉴定化合物.结果:从艾纳香中分离并鉴定了12个化合物,分别为3,3’,5,5’,7-五羟基二氢黄酮(1),3,3’,4’,5-四羟基-7-甲氧基二氢黄酮(2),金圣草素(3),3’,4’,5-三羟基-3,7-二甲氧基黄酮(4),香叶木素(5),3,3’,4’,5-四羟基-7-甲氧基黄酮(6),3,5-二羟基-3’,4’,7-三甲氧基黄酮(7),chrysosplenol C(8),3,3’,5-三羟基-4’,7-二甲氧基二氢黄酮(9),艾纳香素(10),3,3’,5,7-四羟基-4’-甲氧基二氢黄酮(11),3’,5,5’,7-四羟基二氢黄酮(12).结论:化合物1,3～5,8为首次从该属植物中分离得到;化合物6,7为首次从该植物中分离得到.     

念珠根黄芩中的黄酮类化合物

应用硅胶柱色谱、Sephadex LH-20柱色谱及高效制备薄层色谱等方法对念珠根黄芩中的黄酮类化合物进行分离纯化,根据理化性质和波谱数据对其化学结构进行阐明,发现并鉴定了19个黄酮单体,分别为芹菜素(1),木犀草素(2),汉黄芩素(3),千层纸素A(4),6-甲氧基柚皮素(5),5,7,4'-三羟基-6,8-二甲氧基黄酮(6),5,7,8-三甲氧基黄酮(7),3,5,6,7-四甲氧基黄酮(8),7-羟基-4',5,6,8-四甲氧基黄酮(9),5,7,2'-三羟基-6-甲氧基二氢黄酮(10),5,7,4'-三羟基-6-甲氧基黄酮(11),5,7-二羟基-6,8-二甲氧基黄酮(12),5,2',6'-三羟基-7,8-二甲氧基黄酮(13),5,7,2'-三羟基-8-甲氧基黄酮(14),5,2'-二羟基-7,8-二甲氧基二氢黄酮(15),2'-羟基-5,7,8-三甲氧基黄酮(16),5-羟基-7,8-二甲氧基黄酮(17),5,2'-二羟基-7,8-二甲氧基黄酮(18),5-羟基-6,7,8-三甲氧基黄酮(19)。化合物1~19均为首次从念珠根黄芩中发现,化合物6,8,9,12,19为首次从黄芩属植物中发现。     

粘毛黄芩全草的化学成分研究

目的 研究粘毛黄芩Scutellaria viscidula全草的化学成分。方法 通过硅胶柱色谱、Sephadex LH-20柱色谱及高效制备薄层色谱等方法对粘毛黄芩中的化学成分进行分离纯化,根据理化性质和波谱数据对其化学结构进行阐明。结果 从粘毛黄芩全草95%乙醇提取物中分离得到了22个化合物,分别鉴定为5-羟基-7,8-二甲氧基黄酮（1）、白杨素（2）、5,7-二甲氧基黄酮（3）、5,7,4''-三羟基-6-甲氧基黄酮（4）、5,7,4''-三羟基黄酮（5）、5,7,2''-三羟基-8-甲氧基黄酮（6）、5,7-二羟基-8,2''-二甲氧基黄酮（7）、5,7,2''-三羟基-6-甲氧基二氢黄酮（8）、5-羟基-6,7,8-三甲氧基黄酮（9）、5,6,7-三甲氧基黄酮（10）、3,5-二甲氧基-6,7-亚甲二氧基黄酮（11）、5,2''-二羟基-7,8,6''-三甲氧基黄酮（12）、5,2''-二羟基-7,8,6''-三甲氧基二氢黄酮（13）、5,7-二甲氧基二氢黄酮（14）、7-甲氧基白杨素（15）、2''-羟基-5,7,8-三甲氧基黄酮（16）、阿魏酸（17）、3-甲氧基-4-羟基苯甲酸（18）、对羟基苯甲醛（19）、3,5-二甲氧基-4-羟基苯甲酸（20）、6-甲氧基-7-羟基香豆素（21）、6,7-二羟基香豆素（22）。结论 化合物1、3~16、18和20为首次从该植物中分离得到。     

条叶龙胆药材资源变化及未来发展建议

从本草记载开始阐述了龙胆药材4种基源植物中质量最优的条叶龙胆资源的变化。条叶龙胆野生资源的开发是按由南到北的顺序进行的。我国东北地区条叶龙胆的开发较晚,但由于龙胆的生物学特性及草原破坏等多种原因,在几十年的时间内野生资源便遭到了严重破坏。目前野生资源接近枯竭,栽培严重滞后,致使这一优质龙胆药材市场占有率不断降低。条叶龙胆的可持续发展必须以栽培为主,而育种、栽培技术等与高产密切相关的措施的优化与推广等问题急需解决     

Cytotoxic flavonol glycosides from Triplaris cumingiana

Three new compounds, 2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-oxo-4H-chromen-3-yl-4,6-bis-O-beta-D-(3,4,5-trihydroxybenzoyl)glucopyranoside (1), 5,7-dihydroxy-2-(4-hydroxyphenyl)-4-oxo-4H-chromen-3-yl-5-O-alpha-L-(3,4,5-trihydroxybenzoyl)arabinofuranoside (2), and 2-hydroxy-4-O-alpha-L-(3,5,7-trihydroxy-4-oxo-4H-chromen-2-yl)phenylarabinofuranoside (3), were isolated from the young leaves of Triplaris cumingiana, together with two known compounds, quercetin 3-O-alpha-L-(5"-O-galloyl)arabinofuranoside (4) and quercetin 3-O-beta-D-(6"-O-galloyl)glucopyranoside (5). The structures of 1-3 were established by spectroscopic methods. Compounds 1-5 were evaluated for their cytotoxic activities against the MCF-7, H-460, and SF-268 human cancer cell lines.     

Antihyperglycemic activity and chemical constituents of Eysenhardtia platycarpa

The methanolic extracts from branches (BEP) and leaves (LEP) of Eysenhardtia platycarpa significantly decreased the blood glucose levels in normal and streptozotocin (STZ)-induced diabetic rats. One new flavone, (1"R)-5,4',1"-trihydroxy-6,7-(3",3"-dimethylchroman)flavone (1), together with the known compounds 5,7-dihydroxy-6-methyl-8-prenylflavanone (3), 5,7-dihydroxy-8-methyl-6-prenylflavanone (4), 5,7-dihydroxy-6-prenylflavanone (5), 5,7-dihydroxy-8-prenylflavanone (6), 3-O-acetyloleanolic acid (7), oleanolic acid, 3beta-acetoxy-11alpha,12alpha-epoxy-oleanan-28,13beta-olide, lupeol, betulinic acid, beta-sitosterol, beta-sitosteryl beta-D-glucopyranoside, beta-sitosteryl palmitate, and 3-O-methyl-myo-inositol were isolated from BEP. Additionally, one new flavanone, (2S)-4'-O-methyl-6-methyl-8-prenylnaringenin (2), as well as the known compounds 3, 4, 6, 4'-O-methyl-8-prenylnaringenin (8), and 5-hydroxy-7-methoxy-8-prenylflavanone (9) were isolated from LEP. 3-O-Acetyloleanolic acid (7), identified as the major constituent of BEP, showed a significant decrease (31 mg/kg of body weight, P < 0.05) in the glucose level of STZ-induced diabetic rats. The obtained results correlate with the traditional use of this species.     

Antifungal flavonoids from Varthemia iphionoides

Four flavonoids 5,7,4′-trihydroxy-3,3′-dimethoxyflavone (3′,3′-di-O-methylquercetin) (1), 5,4′-dihydroxy-3,7-dimethoxyflavone (kumatakenin) (2), 5,4′-dihydroxy-6,7,8,-trimethoxyflavone (xanthomicrol) (3) and 5,7,4′-trihydroxy-3,6,3′-trimethoxyflavone (jaceidine) (4) were isolated and identified from the Jordanian Varthemia iphionoides. They have not previously been reported in this genus. The aqueous alkaline solution of these compounds showed little or no activity against the bacteria Staphylococcus aureus, Bacillus cereus and Salmonella typhimurium. Compound 2 was active against the fungi Fusarium solani and Candida tropicalis while compounds 1 and 3 were much more active against F. solani, Aspergillus parasiticus and C. tropicalis.     

Two auronols from Pseudolarix amabilis.

Two new auronols, amaronols A (1) and B (2), were isolated from the bark of Pseudolarix amabilis, along with pseudolaric acid B (3), pseudolaric acid C (4), demethoxydeacetoxy-pseudolaric acid B (5), pseudolaric acid B-beta-D-glucoside (6), pseudolaric acid A-beta-D-glucoside (7), and myricetin (8). The structures of amaronols A and B were established by spectral data interpretation as 2,4,6-trihydroxy-2-[(3',4',5'-trihydroxyphenyl) methyl]-3(2H)-benzofuranone and 2,4,6-trihydroxy-2-[(3', 5'-dihydroxy-4'-methoxyphenyl) methyl]-3(2H)-benzofuranone, respectively. Antimicrobial testing results of the eight compounds indicated that only pseudolaric acid B was active against Candida albicans (MIC, 3.125 microg/mL; MFC, 6.25 microg/mL), while myricetin was marginally active against Trichophyton mentagrophytes (MIC, 50 microg/mL).     

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??OBJECTIVE To study the chemical constituents of the chloroform extract from the aerial parts of Artemisa sacrorum. METHODS The chemical constituents were isolated and purified by silica gel and LH-20 column chromatography and preparation HPLC. Their structures were identified by spectral analysis methods. RESULTS Thirteen compounds were obtained and identified as 5-hydroxyl-7,4??-dimethoxyflavone(1), 4-hydroxylacetophenone(2), 5,4??-dihydroxyl-7,3??-dimethoxyflavone(3), 5,7-dihydroxyl-6,4??-dimethoxyflavone(4), 5,7-dihydroxyl-4??-methoxyflavone(5), 5,4??-dihydroxyl-7-methoxyflavone(6), caffeic acid(7), 8-hydroxyl-6,7-dimethoxycoumarin(8), 3,4-dihydroxylbenzoic acid(9), acetophenone-4-O-??-D-glucoside(10), 6-methoxycoumarin-7-O-??-D-glucoside(11), 6,8-dimethoxycoumarin-7-O-??-D-glucoside(12), and 2-hydroxyl-6-methoxyacetophenone-4-O-??-D-glucoside(13). CONCLUSION Compounds 3, 4, 5, 9, 10 and 12 are isolated from this plant for the first time.