Two new furostanol saponins from the seeds of Allium cepa L.

Phytochemical analysis of the n-BuOH extract from the seeds ofAllium cepa L.led to isolation of four furostanol saponins,two of which were new compounds,named ceparoside A（la）and ceparoside B（2a）.The chemical structures of the new compounds were elucidated through a combination of NMR,MS spectral data and chemical analysis.

A Furostanol Saponin from the Cytotoxic Fraction of Tupistra chinensis Rhizomes

A furostanol saponin was obtained from the n-butanol fraction of methanol extract from Tupistra chinensis rhizomes, a folk medicine of Shennongjia Forest District of Hubei Province. Its structure was determined as 3-O-β-D-glucopyranosyl-（25S）-22-O-methyl-5β-furost-1β, 3β, 5β, 22α; 26-pentaol-26-O-β-D-glucopyranoside （1） on the basis of chemical and spectroscopic evidences. The n-butanol fraction displayed marked inhibitory activity in vitro towards HeLa and HL-60 human tumor cell lines by MTT method.

Two New Furostanol Saponins from Tribulus Terrestris L.

Two new furostanol glucosides, named tribufurosides G and H, were isolated from Tribulus terrestris L. The structures of the two new furostanol glucosides were elucidated as 26-O-β-D-glucopyranosyl-（25R）-5α-furost12-one-3β,22α,26-tetraol-3-O-β-D-glucopyranosyl-（ 1→2 ）-β-D-glucopyranosyl-（ 1→4 ）-β-D-galactopyranoside（ 1 ） and 26-O-β-D-glucopyranosyl-（25S）-5 α- 12-one-2 α,3,8,22 α,26-tetraol-3 -O-β-D-glucopyranosyl-（ 1 → 2 ）-β-D-glucopyranosyl-（1→4）-β-D-galactopyranoside（2） by 1 D, 2D NMR techniques, ESI-MS analysis as well as chemical methods.

A New Furostanol Saponin from the Water-extract of Dioscorea nipponica Mak.,the Raw Material of the Traditional Chinese Herbal Medicine Wei Ao Xin

O-a-D-Glucopyranosyl-furost-5(6),20(22)-dien-3a,26-diol 1, a new furostanol saponin, was isolated from the water-extract of Dioscorea nipponica Mak., the raw material of a traditional Chinese herbal medicine Wei Ao Xin. The structure of 1 was determined on the basis of its spectral data especially by NMR spectroscopy. The result provides the first example of naturally occurring furostanol saponins with a single saccharide chain at the C-26 position.

Two new furostanol saponins from Tribulus terrestris L.

Two new furostanol glycoside,26-O-β-D-glucopyranosyl-(25S)-5α-furost-3β,22α,26-triol-3-O-β-D-rhamnopyranosyl-(1→2)-[β-D-glucopyranosyl-(1→4)]-β-D-galactopyranoside(1) and 26-O-β-D-glucopyranosyl-(25S)-5α-furost-20(22)-en-2α,3β,26-triol-3-O-β-D-glucopyranosyl-(1→2)-O-β-D-glucopyranosyl-(1→4)-β-D-galactopyranoside(2) were isolated fromthe fruits of Tribulus terrestris L.The structures of two new furostanol saponins were elucidated by spectroscopic methods.

Furostanol saponins with inhibitory action against COX-2 production from Tupistra chinensis rhizomes

Two furostanol saponins were obtained from the n-butanol fraction of methanol extract from Tupistra chinensis rhizomes, a folk medicine of Shennongjia Forest District of Hubei Province. Their structures were determined as （25S）-26-O-（β-D-glucopyranosyl）- furost-1β, 3β, 22α, 26-tetrol-3-O-β-D-glucopyranosyl-（1 → 4）-β-D-glucopyranosyl-（1 → 2）-β-D-glucopyranoside （1） and （25R）- 26-O-（β-D-glucopyranosyl）-furost-1β, 3β 22a, 26-tetrol 3-O-β-D-glucopyranosyl-（1 → 4）-β-D-glucopyranosyl-（1 → 2）-β-D-glu- copyranoside （2）, on basis of chemical and spectroscopic evidences. 1 and 2 displayed marked inhibitory action towards COX-2 production in macrophages of the rat abdomen induced by LPS at 20 μg/mL.

Five new polyhydroxylated furostanol saponins from the rhizomes of Tupistra chinensis

Five new polyhydroxylated furostanol saponins were isolated from the roots and rhizomes of Tupistra chinensis,and their structures were determined as tupistrosides J–N(1–5),together with four known furostanol saponins(6–9),on the basis of physico-chemical properties and spectral analysis.Among them,compounds 3 and 5 showed cytotoxicity against human cancer cell lines SW620 with IC50 values of 72.5±2.4 and 77.3±2.5μmol·L^–1,respectively.Compound 4 showed cytotoxicity against human cancer cell line HepG2 with IC50 value of 88.6±2.1μmol·L^–1.

Diastereoisomeric saponins from the rhizomes of Tupistra chinensis

A pair of diastereoisomeric furostanol saponins was obtained from the n-butanol fraction of methanol extract from Tupistra chinensis rhizomes, a folk medicine of Shennongjia Forest District of Hubei Province. Their structures were determined, on the basis of chemical and spectroscopic evidences.

知母中呋甾皂甙的研究

自知母ＡｎｅｍａｒｒｈｅｎａａｓｐｈｏｄｅｌｏｉｄｅｓＢｇｅ．根茎的乙醇提取物中，经硅胶柱层析和制备型ＨＰＬＣ分得四种呋甾皂甙。用化学反应和波谱（ＩＲ，ＦＡＢ－ＭＳ，ＥＩ－ＭＳ，１ＨＮＭＲ，１３ＣＮＭＲ，ＤＥＰＴ，一维多重接力ＣｏＳＹ，二维接力ＨＯＨＡＨＡ，１Ｈ－１ＨＣＯＳＹ，１Ｈ－１３ＣＣＯＳＹ和ＮＯＥ差谱）解析，确定其结构为知母皂贰Ｂ（ａｎｅｍａｒｓａｐｏｎｉｎＢ，Ｉ），（２５Ｓ）－２６－Ｏ－β－Ｄ－吡喃葡萄糖基－５β－呋甾－２０（２２）－烯－３β，２６－二醇－３－Ｏ－β－Ｄ－吡喃葡萄糖基（１→２）－β－Ｄ－吡喃哺葡萄糖甙（Ⅱ），（２５Ｓ）－２６－Ｏ－β－Ｄ－吡喃葡萄糖基－２２－羟基－５β－呋甾－３β，２６－二醉－３－Ｏ－β－Ｄ－吡喃葡萄糖基（１→２）－β－Ｄ－吡喃半乳糖甙（Ⅲ），（２５Ｓ）－２６－Ｏ－β－Ｄ－吡喃葡萄糖基－２２－甲氧基－５β－呋甾－３β，２６－二醇－３－Ｏ－β－Ｄ－吡喃葡萄糖基（１→２）－β－Ｄ－吡喃半乳糖甙（Ⅳ）。Ⅱ为一新的呋甾皂甙，命名为知母皂甙Ｃ；化合物Ⅳ为首次从知母中分离得到，命名为知母皂甙Ｅ。初步的药理实验显示，化合物１～Ⅳ均有一定的清除羟自由基的作用。

知母中的两种新呋甾皂苷

目的研究知母根茎的化学成分。方法采用水煎提取、大孔吸附树脂SP825柱色谱、反相C18柱色谱等进行分离,并通过化学手段和光谱分析(FAB-MS,1HNMR,13CNMR,1H-1HCOSY)鉴定其化学结构。结果从知母根茎中分离得到6种甾体皂苷,分别鉴定为:(25S)-26-O-β-D-吡喃葡糖基-22-羟基-5β-呋甾-2β,3β,26-三醇-3-O-β-D-吡喃葡糖基-(1→2)-β-D-吡喃半乳糖苷(知母皂苷N,1),知母皂苷E1(2),(25S)-26-O-β-D-吡喃葡糖基-22-甲氧基-5β-呋甾-2β,3β,26-三醇-3-O-β-D-吡喃葡糖基-(1→2)-β-D-吡喃半乳糖苷(知母皂苷O,3),知母皂苷E2(4),(25R)-26-O-β-D-吡喃葡糖基-22-羟基-5α-呋甾-2α,3β,26-三醇-3-O-β-D-吡喃葡糖基-(1→2)-[β-D-吡喃木糖基-(1→3)]-β-D-吡喃葡糖基-(1→4)-β-D-吡喃半乳糖苷(purpureagitosid,5),marcogenin-3-O-β-D-glucopyranosyl-(1→2)-β-D-galactopyranoside(6)。结论化合物1和3为新化合物,命名为知母皂苷N和知母皂苷O,化合物5为首次从知母中分离得到。

薤白中呋甾皂苷的含量测定

目的 :建立了测定薤白中呋甾皂苷含量的E试剂比色法。方法 :用对二甲氨基苯甲醛 HCl乙醇液的发色体系 ,测定波长 5 15nm ,利用均匀设计原理确定最佳实验条件。结果 :标准曲线在 0 .1975～ 0 .9880mg·ml-1线性关系良好 ,平均回收率为 97.7% (RSD =3.6 5 % )。结论 :此法可作为评价薤白的质量标准。

薤白皂苷化合物对CD40L表达及血小板中性粒细胞黏附的影响

目的探讨薤白皂苷化合物对血小板表面CD40L表达及血小板中性粒细胞黏附的影响。方法制备富含血小板血浆和中性粒细胞,用荧光实时定量PCR和玫瑰花结计数的方法检测经不同浓度薤白化合物单体预处理后血小板表面CD40L的表达及其与中性粒细胞之间的黏附性。结果在6个薤白皂苷单体化合物中,化合物1、4、6呈剂量依赖性抑制血小板CD40L的表达,并明显抑制ADP诱导的血小板与中性粒细胞之间的黏附。结论薤白皂苷化合物可能具有抗血小板相关炎症的作用。

薤白中两种新呋甾皂甙的结构

自中药薤白(Allium macrostemon Bunge)鳞茎中分得三种甾体皂甙。经过化学降解和光谱(UV、IR,MS,~1H-NMR,^(13)C-NMR和FAB-MS)分析,鉴定其结构分别为(25R)-26-O-β-D-吡喃葡萄糖-5α-呋甾-20(22)-烯-3β,26-二醇-3-O-β-D-吡喃葡萄糖基(1→2)[β-D-吡喃葡萄糖基(1→3)]-β-D-吡喃葡萄精基(1→4)-β-D-吡喃半乳糖甙(Ⅰ),(25R)-26-O-β-D-吡喃葡萄糖基-5β-呋甾-20(22)-烯-3β,26-二醇-3-P-β-D-吡喃葡萄糖基(1→2)-β-D-吡喃半乳糖甙(Ⅱ)和异菝契皂甙元-3-O-D-吡喃葡萄糖基(1→2)-β-D-吡喃半乳糖甙(Ⅵ)。Ⅰ和Ⅱ为新的呋甾皂甙,分别命名为薤白甙戊和莲白甙己,初步药理实验测试二青均有较强的抑制ADP诱导的人血小板聚集作用。

呋喃甾烷型皂甙的研究进展

综述了呋喃甾烷型皂甙(双糖链甾体皂甙)的结构特点、化学性质、生理活性和生源合成。列举了1966～1999年发现的双糖链甾体皂甙,共214个。

天冬化学成分的研究(Ⅱ)

目的：研究天冬的化学成分。方法：经大孔树脂、反复硅胶柱色谱、Sephadex LH-20凝胶柱色谱和C-18反相硅胶柱色谱等各种色谱方法分离天冬中的化学成分，通过理化性质和现代波谱技术（MS、^1HNMR,^13CNMR）确定所分离化合物的结构。结果：从其乙醇提取物中分离得到5个化合物，经鉴定分别为薯蓣皂苷元-3-O-β-D-吡喃葡萄糖苷（Ⅰ），异菝葜皂苷元（Ⅱ），26-O-β-D-吡喃葡萄糖基-呋甾-3β，22，26-三醇-3-O-β—D-吡喃葡萄糖基（1→2）-O-β—D吡喃葡萄糖苷（Ⅲ），26-O-β-D-吡喃葡萄糖基-呋甾-5-烯-3β，2α，26-三醇-3-O-[α—α-吡喃鼠李糖基（1→2）]-[α-α-吡喃鼠李糖基-（1→4）]-β—D-吡喃葡萄糖苷（Ⅳ），26-O-β-D-吡喃葡萄糖基-呋甾-3β，26-二醇-22-甲氧基-3-O-α-L-吡喃鼠李糖基（1—4）-O-β-D-吡喃葡萄糖苷（Ⅴ）。结论：化合物Ⅰ～Ⅴ均为首次从天冬中得到。

胡芦巴皂苷VIII的结构鉴定

目的 研究中国产胡芦巴Trigonellafoenum graecumL .种子的化学成分。方法 采用硅胶色谱柱进行分离 ,通过物理、化学和光谱学方法鉴定化合物的结构。结果 分离得到一甾体皂苷 ,命名为胡芦巴皂苷VIII,鉴定其结构为 2 6 O β D 吡喃葡糖基 2 5 (R) 5α 呋甾烷 2 0 ( 2 2 ) 烯 2α ,3 β ,2 6 三醇 3 O β D 吡喃木糖基 ( 1→ 6) β D 吡喃葡糖苷。结论 胡芦巴皂苷VIII为新化合物。

滇黄精中两个呋甾皂苷的NMR研究(英文)

从滇黄精新鲜根茎中分离得到一对立体异构的呋甾皂苷,利用1D、2DNMR鉴定其结构为:26OβD吡喃葡萄糖基25(S)呋甾△5(6)烯3β,22,26三羟基12酮基3OβD吡喃葡萄糖基(1→4)βD吡喃呋糖苷(1,25SkingianosideD)和26OβD吡喃葡萄糖基25(R)呋甾△5(6)烯3β,22,26三羟基12酮基3OβD吡喃葡萄糖基(1→4)βD吡喃呋糖苷(2,kingianosideD).利用1D、2DNMR对两个呋甾皂苷25位的立体构型进行了确定,并对其碳、氢信号进行了全归属.

瓜蒌薤白白酒汤活性成分研究(Ⅱ):呋甾皂苷类成分

目的研究瓜蒌薤白白酒汤发挥作用的物质基础。方法在药理活性指导下利用各种化学和色谱手段对复方进行追踪分离 ,利用化学及波谱手段鉴定化学结构。结果从活性部位中分离得到4个呋甾皂苷类化合物。结论化合物 1和 2为首次从组成该复方中药中分离得到 ,化合物

HPLC-ELSD法测定天冬总呋甾皂苷中AR-Ⅰ的含量

目的：测定天冬总呋甾皂苷中AR—Ⅰ的含量。方法：采用高效液相色谱法，色谱条件：Diamonsil C18（5mm×250mm，5μm）色谱柱；流动相：CH3CN—H2O（36：64）；流速：0．8ml·min^-1；进样量20μl；柱温：室温。以ELSD为检测器，气化温度40℃，气体（N2）压力2．0×10^5Pa。结果：AR—Ⅰ在0．094-0．9400g·L^-1。范围内呈良好线性关系（r=0．9992），检测具有较高的灵敏度和稳定性，平均回收率为101．3％（n=6），RSD=2．36％。结论：HPLC-ELSD为天冬呋甾皂苷的测定提供了简便实用的分析方法。

知母中新的甾体皂苷

从中药知母（ＡｎｅｍａｒｈｅｎａａｓｐｈｏｄｅｌｏｉｄｅｓＢｇｅ．）中分离出一种新的呋甾皂苷，用化学和光谱方法确定其结构为：（２５Ｓ）２６ＯβＤ吡喃葡萄糖基５β呋甾２０（２２）烯２β，３β２６三醇３ＯβＤ吡喃葡萄糖基（１→２）βＤ吡喃半乳糖苷，命名为知母皂苷Ｄ．