Furostanol oligoglycosides from Asparagus cochinchinensis

Three new furostanol oligoglycosides, named aspacochioside A (1), B (2) and C (3), together with the known compound 3-O-[(alpha-L-rhamnopyranosyl-(1 --> 4))(beta-D-glucopyranosyl)]-26-O[beta-D-glucopyranosyl]-(25S)-5beta-spirostane-3beta-ol were isolated from the roots of Asparagus cochinchinensis. Their structures were elucidated by spectroscopic techniques (IR, HR-ESIMS, ESIMS/MS, ID and 2D NMR) and chemical methods as 3-O-[(alpha-L-rhamnopyranosyl-(1 --> 4))(beta-D-glucopyranosyl)]-26-O-[beta-D-glucopyranosyl]-(25S)-5beta-furostane-3beta,22alpha,26-triol (1), 3-O-[(alpha-L-rhamnopyranosyl-(1 --> 4))(beta-D-glucopyranosyl)]-26-O-[beta-D-glucopyranosyl]-22alpha-methoxy-(25S)-5beta-furostane-3beta,26-diol (2), and 3-O-[(alpha-L-rhamnopyranosyl-(1 --> 4))(beta-D-glucopyranosyl)]-26-O-[beta-D-glucopyranosyl]-(25S)-5beta-furost-20(22)-en-3beta,26-diol (3).     

天门冬中的两个新呋甾皂苷aspacochinoside L和aspacochinoside M(英文)

从天门冬的根中分离得到两个新呋甾烷型皂苷aspacochinoside L(1)和aspacochinoside M(2),通过化学和波谱学方法确定了化合物1和2的结构。利用脂多糖(LPS)诱导的小胶质细胞(BV-2)炎症模型,测试了化合物的抗炎活性,其中aspacochinoside M的IC50值为32.26μM。     

Oligofurostanosides from Asparagus cochinchinensis

The aqueous extract of ASPARAGUS COCHINCHINENSIS yielded a new oligofurostanoside 3- O-[alpha- L-rhamnopyranosyl-(1-->4)-beta- D-glucopyranosyl]-26- O-(beta- D-glucopyranosyl)-(25 R)-furosta-5,20-diene,-3beta,26-diol as well as two known furostanosides, methylprotodioscin and pseudoprotodioscin.     

天门冬化学成分的分离与鉴定

目的对中药天门冬(Asparagus cochinchinensis(Lour.)Merr.)的化学成分进行研究。方法采用硅胶柱色谱、制备薄层色谱、重结晶等方法进行分离纯化,通过理化性质和核磁共振波谱数据鉴定化合物结构。结果分离得到8个化合物,分别鉴定为(+)-4′-O-methyl-nyasol(1)、(+)-nyasol(2)、5,7-二羟基-6,8,4′-三甲氧基黄酮(5,7-dihydroxyl-6,8,4′-trimethoxylflavone,3)、菝葜皂苷元(sarsasapogenin,4)、5-羟甲基糠醛(5-hydroxymethylfuraldehyde,5)、β-谷甾醇(β-sitosterol,6)、胡萝卜苷(daucosterol,7)和豆甾醇(stigmasterol,8)。结论化合物3为首次从天门冬属中分离得到,化合物1、8为首次从该植物中分离得到。     

Pregnane glycosides from Dracaena cochinchinensis

Two new pregnane glycosides, named dracaenoside C and D, were isolated from the fresh stems of Dracaena cochinchinensis. Their structures were established as 3β,14α-dihydroxypregna-5,16(17)-diene-20-one?3-O-α-L-rhamnopyranosyl(1→2)[α-L-rhamnopyranosyl(1→4)]-β-D-glucopyranoside (1) and 3β,14α-dihydroxypregna-5,16(17)-diene-20-one?3-O-α-L-rhamnopyranosyl(1→2)[β-D-glucopyranosyl(1→3)]-β-D-glucopyranoside (2) by means of 2D NMR spectral and chemical methods.     

天冬总皂苷的大孔树脂纯化工艺研究

目的:对天冬总皂苷的大孔树脂纯化工艺进行优选。方法:以天冬总皂苷含量等为指标,采用单因素试验考察大孔树脂型号、上样吸附时间、上样液稀释倍数、吸附容量、洗脱溶剂体积分数及用量、洗脱速度,对大孔树脂纯化工艺进行优化,并进行验证试验。结果:HPD-300型大孔树脂对天冬总皂苷吸附及解析能力较强;最优纯化工艺为上样吸附时间60 min,上样液质量浓度0.1 g/mL,吸附容量120 mL(15 BV),使用3 BV的60%乙醇溶液进行洗脱,洗脱速度为4 BV/h。验证试验中总皂苷的平均解析率为68.30%(RSD=0.95%,n=3)。结论:优选的纯化工艺稳定、可行,可较好地分离纯化天冬总皂苷。     

手性色谱柱用于天冬中甾体皂苷类似物的分离

天冬是一味以甾体皂苷为主要活性成分的常用中药。由于其甾体皂苷同系物及同分异构体的存在,在采用正相硅胶与反相ODS柱色谱相结合的方法进行分离时,有些同系物无法有效分离。本实验系统地筛选了不同分离机制的色谱柱,意外地发现纤维素类型的手性色谱柱能够有效分离这些成分,并应用该类型色谱柱对3个混合物进行分离,得到6个单体化合物(1～6)。结构鉴定结果显示,这些较难分离的同系物在结构上的共同差异仅在于C-3位糖链中一个末端糖基的不同(木糖或鼠李糖),并且分离得到的化合物4、6为两个新甾体皂苷。由于在分离纯化天然产物时被分离化合物的结构未知,很少使用手性色谱柱进行分离。该研究提示对于常规难以分离的天然产物,手性色谱柱也是一个重要选择。     

Three new glycosides from Hylocereus undatus

Three new glycosides, undatusides A–C (1–3), and 11 known compounds (4–14) were isolated from the flowers of Hylocereus undatus. Their structures were elucidated on the basis of spectroscopic data and chemical method.     

A new meta-homoisoflavane from the fresh stems of dracaena cochinchinensis

A new meta-homoisoflavane, 10,11-dihydroxydracaenone C (1), together with 7,4′-dihydroxyflavone (2), 7,4′-dihydroxyflavane (3), 4,4′-dihydroxy-2-methoxychalcone (4), 4,4′-dihydroxy-2-methoxydihydrochalcone (5), 7,4′-dihydrohomoisoflavanone (6), 7,4′-homoisoflavane (7), lophenol (8), β-sitosterol (9), stigma-5, 22-diene-3-ol (10), 1-(4′-O-β-d-glucopyranosyl)benzyl-ethan-2-ol (11), 3,4-dihydoxy-1-allylbenezene-4-O-α-l-rhamnopyranosyl-(1 → 6)-O-β-d-glucopyranoside (12), 1-hydroxy-3,4,5-trimethoxybenzene-1-O-α-l-apiopyranosyl-(1 → 6)-O-β-d-glucopyranoside (13), and tachioside (14) have been isolated from the fresh stems of Dracaena cochinchinensis. Their structures have been established by spectroscopic analysis, especially by 2D NMR. This is the first time compounds 11, 13, 14 have been isolated from Dracaena.     

Three new norsesquiterpenoids from the seeds of Alpinia galanga

From the seeds of Alpinia galanga Willd., three new norsesquiterpenoid racemic mixtures, galanols A–C (1–3) were isolated, along with three known sesquiterpenoids (4–6). Their structures were elucidated by means of UV, IR, HR-ESI-MS, 1D NMR and 2D NMR spectroscopic data.     

New furostanol glycosides from the rhizomes of Dioscorea futschauensis R. Kunth

Two new furostanol glycosides, 26-O-β-D-glucopyranosyl-3β,26-dihydroxy-23(S)-methoxyl-25(R)-furosta-5,20(22)-dien-3-O-α-L-rhamnopyranosyl(1→2)-[β-D-glucopyranosyl(1→3)]-β-D-glucopyranoside (dioscoreside E, 1) and 26-O-β-D-glucopyranosyl-3β,26-dihydroxy-25(R)-furosta-5,20(22)-dien-3-O-α-L-rhamnopyranosyl(1→2)-[β-D-glucopyranosyl (1→3)]-β-D-glucopyranoside (prtotogracillin, 2), together with 11 known furostanol glycosides were isolated from the rhizomes of Dioscorea futshauensis R. Kunth. Their structures were elucidated on the basis of spectroscopic analysis (NMR and FABMS). Their anti-fungal activity against the plant pathogenic fungus Pyricularia oryzae and cytotoxic activity on K562 cancer cell line were evaluated in vitro.     

Three new triterpenoid saponins from the stems of Ilex asprella

Three new triterpenoid saponins, namely asprellinoids A–C (1–3), featuring a sulfate substitution in sugar moiety, were isolated from the stems of Ilex asprella (Hook. et Arn.) Champ. ex Benth. Their structures were elucidated by the spectroscopic data analyses including HR-ESI-MS, IR, and NMR spectra, and chemical method.     

A new auronol from Cudrania cochinchinensis

A new auronol, cudrauronol (1), was isolated from the roots of Cudrania cochinchinensis along with 10 known compounds, 1,3,5-trihydroxy-4-prenylxanthone (2), 1,3,7-trihydroxy-4-prenylxanthone (3), 3,4′,5,7-tetrahydroxydihydroflavonol (4), kaempferol (5), 3,6-dihydroxy-1,5-dimethoxyxanthone (6), 2′,4′,5,7-tetrahydroxyflavanolol (7), 3,7-dihydroxy-1-methoxyxanthone (8), 1,3,5-trihydroxyxanthone (9), cudraflavone B (10), and 2′-oxyresveratrol (11). Compounds 1–8 were evaluated for anti-inflammatory activity on lipopolysaccharide-induced nitric oxide production in RAW 264.7 macrophages. Compounds 2–5 were more active than aminoguanidine, with IC₅₀ values of 8.8, 23.2, 27.1, and 11.9 μM, respectively.     

Three new flavone C-glycosides from the aerial parts of Paraquilegia microphylla

Three new flavone C-glycosides, paraquinins A–C, were isolated from the aerial parts of Paraquilegia microphylla (Royle) Dromm. et Hutch, a Tibetan medicine distributed in the Qinghai-Tibet plateau. On the basis of 1D and 2D NMR evidence, their structures were elucidated as acacetin-6-C-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside (1), acacetin-6-C-α- l-rhamnopyranosyl-(1 → 2)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside (2), and acacetin-6-C-α-l-rhamnopyranosyl-(1 → 2)-(6?-O-E-feruloyl)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside (3).     

天冬种植的底肥种类及施用水平的研究

目的探索和掌握天冬种植中的施肥种类和施肥水平，为生产提供高产、经济的方法。方法设计进行了施肥量和施肥种类2个因素，各3个和4个水平的正交实验。结果天冬栽培选用经过适当腐熟的比例为10：1的牛粪和草木灰较好，每株2～3kg的施肥量有较高的产量，在经济上也较实用可行。结论采用本法较适合天冬的种植。     

Three new iridoids from leaves of Cornus officinalis

Three new iridoids, cornifins A–C (1–3), together with a known iridoid, were obtained from EtOAc layer of leaves of Cornus officinalis. The structures of new compounds were elucidated on the basis of extensive spectroscopic analyses. Compound 2 showed weak inhibitory activity against lung cancer cell line A-549 with IC₅₀ value of 29.1 μM.     

Two new flavonols from Cudrania cochinchinensis

Two new flavonols, 6-p-hydroxybenzyl kaempferol (1) and 6-p-hydroxybenzyl quercetin (2), together with six known compounds were isolated from the roots of Cudrania cochinchinensis and their structures elucidated on the basis of spectroscopic methods. Their antioxidant capacities were evaluated by 1,1-diphenyl-2-picryl-hydrazyl and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical-scavenging assays. The results suggested that compounds 2, 4, and 7 showed significant radical-scavenging activities.     

Asparosides A and B,two new steroidal saponins from Asparagus meioclados

Asparosides A ( 1 ) and B ( 2 ), two new saponins, were isolated from the roots of Asparagus meioclados . On the basis of chemical and spectroscopic evidence, their structures were elucidated as 23- O - f -arabinopyranosyl-(5 g ,25s)-spirostan-3 g ,23 f -diol-3- O -[ g - d -xylopyranosyl(1 M 4)]- g - d -glucopyranoside and 26- O - g -glucopyranosyl-5 g -furost-20(22)-ene-3 g ,26-diol-3- O -[ g - d -xylopyranosyl(1 M 4)]- g - d -glucopyranoside, respectively.     

Furostanoside from Asparagus filicinus

A new furostanoside, named aspafilioside D (1), together with the five known compounds officinalisnin-II (2), Asp-IV' (3), (+)-4'-O-methyl-nyasol (4), (+)-nyasol (5) and tormentic acid (6), have been isolated from the roots of Asparagus filicinus. The structure of 1 has been elucidated on the basis of spectral data.     

Two new phenolic compounds and antitumor activities of asparinin A from Asparagus officinalis

Two new phenolic acid compounds, asparoffin C (1) and asparoffin D (2), together with four known compounds, asparenyol (3), gobicusin B (4), 1-methoxy-2-hydroxy-4-[5-(4-hydroxyphenoxy)-3-penten-1-ynyl] phenol (5), and asparinin A (6), have been isolated from the stems of Asparagus officinalis. The structures were established by extensive spectroscopic methods (MS and 1D and 2D NMR). Compound 6 has obvious antitumor activities both in vitro and in vivo.