锈毛寄生化学成分的研究

从锈毛寄生叶中分得4种化合物,经理化性质及光谱分析鉴定为原儿茶酸、异槲皮甙、槲皮素-3-O-(6″-没食子酰基)-β-D-葡萄糖甙、槲皮素-3-O-β-D葡萄糖醛酸甙,均为首次从该植物中获得。     

鞘花寄生化学成分的研究

从鞘花寄生Macrosolencochinchinensis的叶中分得6种化合物，由理化性质和光谱分析鉴定为槲皮素（quercetin，Ⅰ），没食子酸（gallicacid，Ⅱ），荭草素（orientin，Ⅲ），芦丁（rutin，Ⅳ），槲皮素-3-芹菜糖基芦丁糖甙（quercetin－3－O－apiosyl（1→2）－[rhamnosy（1→6）]－glucoside，Ⅴ），新西兰牡荆甙-Ⅱ（vicenin-Ⅱ，Ⅵ）。     

离瓣寄生化学成分的研究

从离瓣寄生Ｈｅｌｉｘａｎｔｈｅｒａ Ｐａｒａｓｉｔｉｃａ的叶中分得４种结晶。经理化性质及光谱分析鉴定为没食子酸（Ⅰ），没食子酸（Ⅱ）、槲皮甙（Ⅲ），５，７，３＇，４＇－四羟基黄烷。Ⅳ为一新的黄烷化合物。     

毛叶寄生化学成分的研究

从毛叶寄生TaxillusnigransDanser的叶中分得8种化合物，由理化性质及光谱分析鉴定，它们分别为（＋）-儿茶素〔（＋）－catechin,Ⅰ〕，7－O-没食子酰-（＋）-儿茶素〔7－O－galloyl－（＋）－catechin，Ⅱ〕，异槲皮甙（isoquercitrin，Ⅲ），广寄生甙（avicularin，Ⅳ），槲皮素-3-O－（6″-没食子酰基）-β-D-葡萄糖甙〔quercetin－3-O（6″-galloyl）-β-D-glucoside,Ⅴ〕，槲生素-3-O-（6″-没食子酰基）－β-D-半乳糖工期甙〔quercetin－3－O（6″-gal-loyl）-β-D－galactoside，Ⅵ〕，芦丁（rutin，Ⅶ），槲皮素-3-O-β-D-葡萄糖醛醒甙（qu－ercetin－3－O-β-glucuronide，Ⅷ）。     

南方菟丝子化学成分的研究

从南方菟丝子中分得1个新的二萜甙成分,命名为南菟丝子甙A,根据理化性质和光谱数据,阐明了它的化学结构。另外尚分得胸腺嘧啶脱氧核苷咖啡酸,对羟基桂皮酸,咖啡酸-β-D-葡萄糖酯甙,均为首次从菟丝子属植物中获得。     

竹灵消的化学成分研究(Ⅲ)

从竹灵消Ｃｙｎａｎｃｈｕｍ ｉｎａｍｏｅｎｕｍ的根中分得２个化合物，通过光谱分析和化学反应分别鉴定为白薇甙和白薇甙Ｅ，它们均系首次从该植物中分得。     

竹灵消的化学成分研究(Ⅲ)

从竹灵消Cynanchuminamoenum的根中分得2个化合物，通过光谱分析和化学反应分别鉴定为白薇甙C（晶Ⅶ）和白薇甙E（晶Ⅷ），它们均系首次从该植物中分得。     

藓生马先蒿化学成分研究(Ⅱ)

从藓生马先蒿全草分得4个糖甙化合物,根据理化常数及光谱分析鉴定为1个木脂素甙和3个单萜环烯醚甙:丁香醇-4″-O-β-D-吡喃葡萄糖甙、胡麻甙、糙苏甙Ⅱ和山栀子甙。     

川续断中林生续断甙Ⅲ的结构研究

从川续断Dipsacusasperoides根的乙醇提取物中分得4个化合物，经理化性质、光谱分析和文献对照，鉴定为林生续断甙Ⅲ、蔗糖、胡萝卜甙和β-谷甾醇。其中林生续断甙Ⅲ为首次从川续断中分得。     

高效液相色谱法测定独活寄生丸中芍药甙和甘草酸的含量

采用反相高效液相色谱法测定独活寄生丸中芍药甙和甘草酸的含量。方法准确，快速，可靠，能起到控制独活寄生丸质量的作用，同时也适合于含有芍药及甘草的制剂中芍药甙和甘草酸的测定。     

Antioxidant, anti-inflammatory, and antiproliferative activities of Taxillus sutchuenensis

Inflammation is related to several chronic diseases, including cancer and atherosclerosis. Taxillus sutchuenensis (Lecomte) Danser is a special folk medicinal plant in Taiwan. The aim of this study was to evaluate the antioxidant, anti-inflammatory, and antiproliferative activities of the aqueous-thanol extract from T. sutchuenensis (AETS) and its fractions. TEAC, DPPH radicals, total phenolic compounds, total flavonoid content, inhibition of NO production in LPS-induced RAW264.7 cells, and inhibition of cancer cell proliferation were tested. Among all fractions, the ethyl-acetate (EA) fraction showed the highest TEAC and DPPH radical scavenging activities. The EA fraction also had the highest polyphenol and flavonoid content. The EA fractions also decreased LPS-induced NO production and the expression of iNOS and COX-2 in RAW264.7 cells. The antiproliferative activities of the aqueous/ethanol extract and fractions were studied in vitro using A549 cells, and the results were consistent with their antioxidant capacities. EA fractions had the highest antiproliferative activity with an IC(50) of 454.38 ± 1.48 μg/ml. Quercetin also had antioxidant, anti-inflammatory, and antiproliferative activities. Quercetin might be an important bioactive compound in T. sutchuenensis. The experimental data indicated that T. sutchuenensis is a potent antioxidant medicinal plant, and such efficacy may be mainly attributed to its polyphenolic compounds.     

Quality assessment of Paliurus spina-christi extracts.

Because the flavonoid glycosides can be considered as suitable compounds for the quality assessment of Paliurus spina-christi Mill., a high-performance liquid-chromatographic method for the separation and quantification of these compounds in methanolic extracts of the different plant parts (leaves, flowers, fruits) is described. The system used is a reversed-phase column and gradient elution with water-phosphoric acid-acetonitrile. The analysis showed the flavonoid contents of the different plant parts and the different composition of the flavonoid pattern. The highest flavonoid content was found in the leaves in June and July. No significant influence of growing site or year of harvesting on the flavonoid content was observed. As quercetin 3-O-rhamnoglucoside 7-O-rhamnoside and rutin are the main flavonoid compounds present in all plant parts investigated, it is suggested that these compounds should be used for the quality assessment of Paliurus spina-christi.     

Yanangdaengin, a dihydrochalcone glucoside galloyl ester as active antioxidative agent from leaves of Lysiphyllum strychnifolium (syn. Bauhinia strychnifolia)

Objective: To isolate and identify the major bioactive components from the leaves of Lysiphyllum strychnifolium, an indigenous herb used in traditional Thai medicine for detoxification, longevity, and some other health related issues. Methods: Comparative HPLC analyses of the crude extracts from three provenances were carried out for an overview of characteristic compound profiles. Isolation of the major compounds was undertaken with chromatographic methods. Chemical structures were elucidated by NMR spectroscopic techniques and mass spectrometry. DPPH scavenging assay was carried out to determine the free radical scavenging activity of isolated compounds. Results: Yanangdaengin (3), a dihydrochalcone glucoside galloyl ester, has been isolated together with its corresponding dihydrochalcone glucoside trilobatin (2) as major compounds from the leaves of L. strychnifolium. Additionally, gallic acid (1) was co-chromatographically identified. Free radical scavenging activity of isolated compounds were determined. Compound 3 exhibited higher free radical scavenging activities in comparison to Trolox and quercetin. Conclusion: The isolated compounds could be used as chemical markers for quality assessment. The present work could promote the quality control and herbal medicinal product development of this plant.     

三七叶黄酮类成分的研究

从云南文山栽培的三七[Panax notoginseng(Burk. )F. H. Chen]叶中首次分得一种黄酮甙,用化学方法及紫外、红外、质谱、~1H核磁共振,~(13)C核磁共振等方法鉴定为槲皮素-3-O-槐糖甙。     

羊踯躅的代谢组学研究

目的:鉴定羊踯躅花、茎、叶的全部代谢物和不同部位间含量有差异的代谢物,分析差异代谢物的代谢通路。方法:采用广泛非靶向代谢组学对羊踯躅不同部位的代谢物进行比较分析。结果:共鉴定出535个代谢物,其中包括金合欢素、落新妇苷、苔黑酚龙胆二糖苷、去甲蟛蜞菊内酯、补骨脂定、秦皮素、络塞维等49个在其他植物中分离鉴定出的具有药用活性的化合物;鉴定出差异代谢物202个,包括β-氰基丙氨酸、蜀黍苷和黄曲霉毒素G23个有毒代谢物,且这3个有毒代谢物分别在花、茎、叶中含量最高;鉴定出百里香酚、丹皮酚、欧芹酚、东莨菪内酯、异泽兰黄素、野鸢尾黄素、石蒜碱和豆甾醇8个有药用价值的化合物,其在花、茎、叶中含量差异有统计学意义;排名前4位的差异代谢物通路中,花、茎、叶共有的通路为精氨酸生物合成,丙氨酸、天冬氨酸和谷氨酸代谢,以及氨酰基-tRNA生物合成通路,其中涉及花的通路还包括氰基氨基酸代谢通路。结论:羊踯躅中存在丰富的天然药用活性产物,使其药用价值并不限于毒性成分;氨基酸的合成与代谢是不同部位代谢物差异的主要原因。研究结果可为进一步筛选解析羊踯躅中药用价值较高的关键代谢物提供参考。     

Antioxidant flavonoids and phenolic acids from leaves of Leea guineense G Don (Leeaceae)

From leaves of Leea guineense (Leeaceae) three hydrophilic flavonoids were isolated and identified as quercetin-3'-sulphate-3-O-alpha-L-rhamnopyranoside, quercetin-3,3'-disulphate and a new flavonoid sulphate, quercetin-3,3',4'-trisulphate, together with kaempferol, quercetin, quercitrin, mearnsitrin, gallic acid and ethyl gallate. The structures were established by spectroscopic analysis (UV, MS, (1)H-NMR, (13)C-NMR and 2D-NMR). Their antioxidant effect on free radical scavenging was evaluated in the DPPH assay.     

国产沉香中的三萜成分

从国产沉香Ａｑｕｉｌａｒｉａ ｓｉｎｅｎｓｉｓ中分得１４个化合物,其中羟基何帕酮为首次从该属植物中分到的三萜化合物,在沉香的化学成分研究中,尚未见该类化合物的报道。     

20(S)-原人参二醇组皂苷的制备及其转化制取人参皂苷Rh2

目的：制取２０（Ｓ）原人参二醇组皂苷并将其转化制备抗癌活性单体２０（Ｓ）人参皂苷Ｒｈ２。方法：以国产西洋参茎叶总皂苷为原料，通过萃取法制备２０（Ｓ）原人参二醇组皂苷；将２０（Ｓ）原人参二醇组皂苷碱催化水解后，经柱层析分离纯化制备２０（Ｓ）人参皂苷Ｒｈ２。结果：２０（Ｓ）原人参二醇组皂苷收率为４１．５％，其转化成２０（Ｓ）人参皂苷Ｒｈ２的转化率为９．６４％。结论：制取方法简便，收率较高。     

Flavonoid composition and antimicrobial activity of Cirsium rivulare (Jacq.) All. flowers

A new flavonoid compound isokaempferide 7-O-beta-d-(6'-methylglucuronide) (1) was isolated from flowers of Cirsium rivulare (Jacq.) All. Its structure was elucidated on the basis of spectroscopic studies (UV, (1)H and (13)C NMR, FABMS). Moreover, five known flavonoid compounds: apigenin 7-(6'-methylglucuronide) (2), hispidulin 7-glucoside (3), isokaempferide 7-glucuronide (4), kaempferol 3-galactoside (5), pectolinarin (6) were isolated from this source for the first time. The antimicrobial activity of aqueous, methanolic and 70% ethanolic extracts of Cirsium rivulare flowers and leaves was also evaluated.     

四川寄生的化学成分研究

从寄生于梨树的四川寄生Taxillus sutchuenenisis(Lecomte)Danser中分离并鉴定了9个化合物,分别为:槲皮素(quercetin,Ⅰ),槲皮素3-O-β-D-半乳糖苷(quercetin 3-O-β-D-galactoside,Ⅱ),异槲皮苷(isoquercitrin,Ⅲ),槲皮苷(quercitrin,Ⅳ),芦丁(rutin,Ⅴ),没食子酸(gallic acid,Ⅵ),阿魏酸(ferulic acid,Ⅶ),β-谷甾醇(β-sitosterol,Ⅷ),胡萝卜苷(daucosterol,Ⅸ)。化合物Ⅲ~Ⅸ为首次从该植物中分得。