大叶清香桂中甾体生物碱的分离与鉴定

从大叶清香桂分离鉴定了３个新甾体生物碱大叶清香桂碱Ａ,Ｂ,Ｃ（Ⅰ,Ⅱ,Ⅲ）和３个已知化合物矮陀陀碱Ｆ（Ⅳ）、矮陀陀胺碱Ａ（Ⅴ）和富贵草碱（Ⅵ）。通过光谱分析和化学转化,确定３个新化合物的化学结构为：２０ａ－二甲胺基－４β－乙酰氧－３β－千里酰胺基－５ａ－孕甾烷（Ⅱ）,２０ａ－二甲胺基－４β－羟基－３－千里酰胺基－△＾２（３）－孕甾烯（Ⅱ)化合物Ⅱ的4-乙酰貂（Ⅲ）。     

异甾体生物碱类化合物及药理活性研究进展

异甾体生物碱类结构多变,药理活性多样,主要分布于百合科贝母属和藜芦属植物中。近十五年内共报道了80个新发现的异甾体生物碱类成分,药理活性涉及抗炎、镇痛、降压、平喘、抗血栓、胆碱酯酶抑制、抗病毒和抗肿瘤等作用。本文综述了2006至2020年间该类化合物的植物来源、化学结构及药理活性,并对该类化合物的未来研究探索进行了讨论与展望。     

蒙自藜芦的甾体生物碱研究

从蒙自藜芦(Veratrum mentzeanum Loesn.f.)的须根中分离到11个化合物,其中6个鉴定为甾体生物碱,即:藜芦胺(veratramine)、藜芦胺N-氧化物(veratramine N-oxide)、藜芦明宁(veramiline)、3,15-二当归酰基计明碱(3,15-diangeloyl-ger-mine)、3-当归酰基计明碱(3-angeloyl-germine)、龙葵胺(solanidine);另外5个分别鉴定为β-谷甾醇、β-谷甾醇硬脂酸酯、胡萝卜甙、蜡酸及硬脂酸。其中藜芦胺N-氧化物和3-当归酰基计明碱系首次从植物中分离到。     

药用植物甾体生物碱的药理作用及合成途径

甾体生物碱是药用植物中广泛存在的一类代谢产物,是一类具有降压、止咳、平喘、抗肿瘤等生物活性的天然产物。目前,甾体生物碱的合成代谢途径、分离纯化、鉴别及生物学功能研究已成为国内外天然产物研究的热点之一。对药用植物甾体生物碱的药理作用进行了综述,并根据萜类物质合成途径,推测总结了甾体生物碱的合成相关途径和参与该途径的关键酶及其基因克隆的研究进展,以期为药用植物甾体生物碱的代谢途径与基因表达调控及应用研究提供参考。     

毛叶藜芦中甾体生物碱鉴定及其促进溶酶体生成活性的研究

研究毛叶藜芦中的甾体生物碱类成分及其促进溶酶体生成活性.应用柱层析,反相色谱,凝胶色谱等手段对毛叶藜芦根部的甲醇提取物进行分离,再根据其理化性质、UHPLC-MS/MS、NMR等现代波谱技术,对分离得到的生物碱进行结构鉴定,并通过Red DND-99溶酶体红色荧光探针对甾体生物碱促进溶酶体生成活性进行初步筛选研究.鉴定...     

太白米中的甾体生物碱苷

对太白米的叶、大鳞茎和小鳞茎进行了化学成分系统预试,从大鳞茎中分离得到4个甾体生物碱苷,通过对其IR、FABMS、SIMS、1^HNMR、13^CNMR、DEPT、HMQC、HMBC和1^H-1^H COSY的综合解析鉴定了其中3个结构,它们分别为茄次碱-3-O-α-L-吡喃鼠李糖-(1→2)-β-D-吡喃葡萄糖苷(Ⅱ)、茄次碱-3-O-α-L-吡喃鼠李糖-(1→2)-[β-D-吡喃葡萄糖(1→4)]-β-D-吡喃葡萄糖苷(Ⅲ)和茄次碱-3-O-α-L-吡喃鼠李糖-(1→2)-[β-D-吡喃葡萄糖-(1→3)-β-D-吡喃葡萄糖(1→4)]-β-D-吡喃葡萄糖苷(IV)。     

乐山蜘蛛抱蛋的甾体皂甙

乐山蜘蛛抱蛋;;蜘蛛抱蛋皂甙;;铃兰皂甙元Ｂ－５－Ｏ－β－Ｄ－吡喃葡萄糖甙     

龙舌兰发酵叶汁中的一个新甾体皂苷

从龙舌兰（Agave americana)的发酵叶汁中分离到一个新甾体皂苷。结合波谱和化学方法,新化合物的结构鉴定为替告皂苷元3－O－α－L－鼠李吡喃糖基－（1→3)－β-D-葡萄吡喃糖基－（1→2）-[β-D-葡萄吡喃糖基－（1→3)-β－D－葡萄吡喃糖基－（1→4）－β－D－半乳吡喃糖苷。     

中国大鲵营养成分和功能因子研究进展

主要介绍了中国大鲵各种营养成分和功能因子的营养和保健功能,中国大鲵含有蛋白质、脂类、氨基酸、微量元素等营养成分和金属硫蛋白、胶原蛋白、表皮活性变白因子和多聚糖肽等多种保健功能因子,并对中华大鲵资源的开发进行了分析,为大鲵的保护和资源利用提供参考。     

Triterpenoid Alkaloids from Buxus microphylla

Two new triterpenoid alkaloids, buxmicrophyllines J and K ( 1 and 2 , resp.), together with four analogues, 3 – 6 , were isolated from the leaves and stems of Buxus microphylla. The structures of the new compounds were elucidated by NMR and MS spectroscopic analyses. The partial assignments of the NMR spectra of 3 were also revised. Compounds 1 and 3 – 6 were evaluated for their growth inhibitory activity against human cell lines HL‐60, SMMC‐7721, A‐549, SK‐BR‐3, and PANC‐1. Compound 6 showed significant cytotoxicity against HL‐60, SK‐BR‐3, and PANC‐1 cell lines, with IC₅₀ values of 6.46, 19.61, and 28.57 μM , respectively.     

Steroidal Alkaloids from Sarcococca vagans

Sarcococca vagans Stapf (Buxaceae) was distributed in Southern Yunnan, China. From the plant collected in Xishuangbanna,three new steroidal alkaloids named vaganines A,B and C( Ⅰ–Ⅲ )together with three known compounds were isolated and on the basis of spectral analyses and chemical evidence, the chemical structures of three new compounds were determined as 20α-dimethylamino-4β-acetoxyl-3β-senecioylamino-5α-pregnane (Ⅰ), 20α-dimethylamino-4β hydroxyl- 3-senecioylamino-△2(3)-pregnaene (Ⅱ), acetate of Ⅱ (Ⅲ); respectively.     

Two New Buxus Alkaloids from Buxus Microphylla Sieb. et Zucc.

Five compounds were isolated from Buxus microphylla Sieb. et Zucc. Based on the physico-chemical constants and spectral analysis (IR, MS, 1H-NMR and 13C-NMR), they were identified as cycloprotobuxinamine ( Ⅰ ), buxmicrophylline A ( Ⅱ ), buxtauine M ( Ⅲ ), isoscopoletin (Ⅳ) and epi-lupeol ( Ⅴ ). ( Ⅰ ) and ( Ⅱ ) were new compounds. The structure of buxmicrophylline ( Ⅱ ) was confirmed by X-ray crystallographic analysis.     

Three New Steroidal Alkaloids from Pachysandra axillaris

This paper describes the chemical structure elucidation of the three new alkaloids isolated from Pachysandra axillarls Franch. They are pachysamine G (20α-dimethylamino-3β-tigloylamino-5α-pregnane), pachysamine H (20α-dimethylamino-3α-N-methyl, benzoylamino-5α-pregnane) and pachysanaximine A (20 α-dimethylamino-3β-methylamino-4β-benzoxyl-5α-pregnane) respectively. Other two compounds were identified as Pachysamine A, B.     

Steroidal alkaloids from Solanum erianthum and their anti-breast cancer properties

Two new glycoalkaloids, erianosides A (1) and B (2) along with five known compounds (3–7) were isolated from the leaves of Solanum erianthum. Their structures were elucidated from analyses of spectroscopic data and all isolates were tested for in vitro cytotoxic activity against human breast cancer cell lines (BT-549, MDA-MB-231, T74D, and MCF-7). Solasonine (5) and solamargine (6) were active against the aforementioned four cancer cell lines with IC₅₀ values of 27.26–35.89 and 5.84–10.13 μM, respectively. Erianoside A (1) (T74D: IC₅₀, 56.39 µM) and solasodine (3) (BT-549 and MDA-MB-231: IC₅₀, 59.15 and 75.63 µM, respectively) had moderate cytotoxic effects towards some cell lines in the panel.     

皱叶黄杨的一个新异名

根据对小叶黄杨(Buxus sinica (Rehder & Wilson)Cheng ex M.Cheng var.parvifolia M.Cheng)模式标本的研究, 并比较皱叶黄杨(Buxus rugulosa Hatusima)的标本, 而将小叶黄杨作为皱叶黄杨的新异名。