A New Flavan-3-ol Glucoside from Daphniphyllum oldhami

A new flavan-3-ol glucoside, (-)-afzelechin-7-O-β-D-glucopyranoside (1), has been isolated from the stem of Daphniphyllum oldhami. The structure of the new compound was elucidated on the basis of detailed spectroscopie analysis and comparison with related compounds.

UPLC-Q-TOF-MS法分析枇杷叶的倍半萜苷类化合物

目的采用超高效液相-四级杆-飞行时间串联质谱(UPLC-Q-TOF-MS)技术对分离得到的枇杷叶总倍半萜苷类成分进行定性分析,并对其裂解途径进行研究总结。方法枇杷叶乙醇提取物经大孔树脂、聚酰胺柱色谱和RP-18柱色谱处理后,得到的枇杷叶总倍半萜苷采用Agilent ZORBAX SB-C18色谱柱(4.6 mm×100 mm,1.8μm),甲醇-0.1%甲酸水溶液为流动相进行梯度洗脱,ESI源负离子模式下采集质谱数据。结果从总倍半萜苷中得到5个倍半萜苷类化合物,其二级质谱裂解规律均相同,表现为逐个脱去寡糖链上的糖基,产生特征碎片离子m/z 675、529、383,最后生成m/z 205的特征苷元碎片。结论其中2个倍半萜苷类成分可能是仅在苷元C-6和C-7位上构型有差异的loquatifolin A和6,7-cis-nerolidol-3-O-α-L-rhamnopyranosyl-(1→4)-α-L-rhamnopyranosyl-(1→2)-[α-L-rhamnopyranosyl-(1→6)]-β-D-glucopyranoside。

A New Acylated Flavonoid from Anaphalis aureo-punctata

A new acylated flavonoid glycoside, 3-O-kaempferol-3-O-acetyl-6-O-(p-coumaroyl)-- D-glucopyranoside 1 was isolated from the whole plant of Anaphalis aureo-punctata. The structure was established by spectral methods.

青蕨植物化学成分的研究(英文)

从青蕨根部的乙酸乙酯提取物中分离得到4个化合物.通过化学及波谱分析鉴定其结构为:saucerneolD1,dehydrogoniothalamin2,1-acetoxyl-2-piperonyl-6-[6-methoxyl-piperonyl]-3,7-dioxabicyclo-[3,3,0]-octane3and5,5′-dihydroxy-3-methoxy-6,8,3″,3″-tetramethylpyran-3′,4′flavone-7-O-[β-D-apiofuranosyl-1→6]-β-D-glucopyranoside4.其中化合物4为新化合物,化合物1为首次从该属植物中分离得到.

Two New Flavonoid Glycosides from Chrysanthemum morifolium

Two new flavonoid glycosides were isolated from the flowering heads of Chrysanthemum morifolium. Their structures were determined to be luteolin 4＇-methoxy-7- O-（6＂-O-acetyl）-β-D-glucopyranoside （1） and acacetin 7-O-（3＂-O-acetyl）-β-D-glucopyranoside （2） by means of 1H and 13C NMR spectroscopic analysis, including 2D NMR technique.

Spirostane Steroidal Saponins from the Undergroud Parts of Tupistra chinensis

Two new spirostanol saponins, (25S)-spirostane-1β,3β,5β-triol 3-O-β-D-glucopyrano- side 1 and rhodeasapogenin 3-O-β-D-glucopyranosyl-(1 → 4)-β-D-glucopyranoside 2, together with a known saponin, rhodeasapogenin 3-O-β-D-glucopyranoside 3, were isolated from the underground parts of Tupistra chinensis Bak.. Their structures were determined by spectroscopic analysis.

A new flavonoid glucoside from Cassia angustifolia

A new flavonoid glucoside with a known one was isolated from the leaves of Cassia angustifolia. Based on the spectral analysis, including MS, ^1H NMR, ^13C NMR, DEPT, ^1H-1HCOSY, HMQC, HMBC and NOSEY, their chemical structures were determined as kaempferol-3-O-[（6＇＇＇-O-trans-sinnapoyt）-β-D-glucopyranosyl （1 → 6）]-β-D-glucopyranoside 1 and apigenin-6,8-di-C-glycoside 2.

Chemical constituents and anticoagulant activity from Delphinium brunonianum Royle

Delphinium brunonianum Royle belongs to Ranunculaceae family and has the effects of dispelling wind to relieve itching and cooling blood to detoxify.It was found that the extracts of D.brunonianum had good anticoagulant activity which was extracted with 70%ethanol in our previous researches.Then,16 compounds were isolated and identified from the extract of D.brunonianum,among which compounds 5,7-10,12,14,15-16 were isolated from this genus for the first time,and compounds 2-4 were isolated from this plant for the first time.And the coagulation activity assay showed that compounds 10,14 and 15 had good anticoagulant activity by activated partial thromboplastin time(APTT),thrombin time(TT)and prothrombin time(PT)in vitro.

红葱的化学成分研究

目的研究红葱Eleutherine americana的化学成分。方法采用硅胶柱色谱、Sephadex LH-20柱色谱及重结晶等方法,分离纯化红葱的化学成分,通过MS、NMR等波谱技术确定化合物结构。结果确定了7个化合物的结构,分别为9-hydroxy-8-methoxy-1-methyl-1,3-dihydronaphtho[2,3-c]furan-4-O-β-D-glucopyranoside(1)、eleutherinoside A(2)、豆甾醇-3-O-β-D-葡萄糖苷(3)、kadsuric acid(4)、豆甾醇(5)、1,2-二羟基-8-甲氧基-3-甲基蒽醌(6)、9-methoxy-1,3-dimethyl-1H-naphtho[2,3-c]pyran-5,10-dione(7)。结论化合物1为新化合物,命名为红葱新苷。化合物3～5为首次从该植物中分离得到,化合物6和7为首次获得的新天然产物。