525 resultados para ORNITHOGALUM CAUDATUM AIT


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A water-soluble crude extract prepared from Ornithogalum caudatum Ait. (OCA) showing a high immunomodulating activitiy was isolated and characterized by virtue of get filtration and column chromatography. The presence of the monosaccharides has been established by the chemical analysis. The quantitative analysis of the alditol acetate derivatives of them showed the ratios of the monosaccharides analyzed by means of GC respectively. The concentrations of protein(280 nm) and carbohydrate (496 nm) were detected respectively. The information of the molecular weight from the pure polysaccharide was obtained by several standard Dextrans from the Sephadex chromatography.

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选取天然产物虎眼万年青作为研究对象,对一其化学成分及药理活性进行了系统的研究。针对不同成分极性的显著差异,分离、纯化出13种化合物,并鉴定了其中的弱极性的小分子物质。采用COZ超临界提取技术,对易挥发的19种成分分别作了鉴定。对其中具有药理活性的多糖、皂营及生物碱等成分,经进一步分离、纯化,并借助现代波谱技术,对其单一成分进行了跟踪、表征。研究了虎眼万年青不同组分的抗肿瘤、抗辐射作用。首次筛选出了有显著药理活性的虎眼万年青中性多糖53,并从非特异性免疫功能、体液免疫功能和细胞免疫功能等角度,即从细胞和分子水平较全面地研究了S3的免疫增强作用。结果表明,53能显著增强小鼠T淋巴细胞的转化、提高NK细胞细胞毒活性,不同程度的使CD3、CD4、CD4/CDS升高而使CDS下降,从分子水平证实了S3对辅助性T细胞(Th)的增强作用及对抑制性T细胞(Ts)的降低作用,推测Tl:可能是其主要的原发刺激细胞。此外,S3不仅能促进细胞因子IL-2的产生,还能使IL-1mRNA基因表达量显著增加,从基因水平进一步证实了53有提高小鼠免疫功能的作用。首次利用电喷雾质谱(ESI-MS),在较温和的条件下得到了具有较高稳定性的新型簇合物离子K+K(NO3)n:和NO3-(KNO3)m。并利用现代量子化学程序对低聚合度簇合物离子的可能组态进行了总成键能的计算,给出了相对稳定的组态。计算结果说明,n=2,3,6组态稳定性高的原因是总成键能高,而m≤4阴离子簇合物不能直接形成的原因是由于溶剂化作用。电喷雾质谱的进样过程与晶体的成核过程相类似,通过气相离子簇合物的组态信息和形成机理的研究,可以为晶体成核理论和化学键理论提供某些证据。

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虎眼万年青(Ornithogalum caudatum Ait)俗名珍珠草,为百合科虎眼万年青属多年生草本植物.其原产非洲南部,我国北方有栽培.民间用其全草或球茎入药,主要用于消炎和抗癌.从该属植物中曾分离得到胆甾烷苷和降胆甾烷苷类成分.

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首先,对虎眼万年青中化学成分进行了分离提取研究,采用柱层析和薄层层析等方法,并利用电喷雾质谱技术跟踪洗脱流分,首次从虎眼万年青氯仿提取物中分离得到两个新化合物。其一为单菇内酷loliolide,通过FT-ICRMS高分辨质谱、IR和NMR等手段对其结构进行了确定,并通过IHNMR和旋光法确定了其绝对构型。此外,还利用电喷雾多级串联质谱(ESI一MSn)技术对其质谱裂解规律进行了系统研究,其分析结果与NMR解析结果完全一致,建立了该类化合物结构解析的简便、快速的质谱新方法;另一化合物为生物碱类化合物,采用电喷雾多级串联质谱技术对其质谱裂解规律进行了详细研究,并对其结构进行了初步推断,进一步的NMR结构确定正在进行中。其次,对虎眼万年青多糖成分进行了分离提取研究,并结合体外抑瘤活性评价实验,确定了两种具有抑瘤生物活性的多糖成分OC一2一1一c和OC一2一卜d。并通过SDS凝胶电泳和糖基组成分析,初步证明了虎眼万年青中的活性多糖成分为阿拉伯半乳糖蛋白(AGPs),为进一步研究虎眼万年青抗肿瘤活性提供了基础数据和理论指导。此外,还对虎眼万年青中的微量元素及其溶出率进行了初步的研究,研究结果表明,其水煎液中Cu/Zn比值明显低于癌症患者血清中的Cu/Zn比值,因此,虎眼万年青可能有助于调节癌症患者体内的Cu、Zn平衡,从而达到抗癌目的;而虎眼万年青中Se、Ge含量很低,不能作为两种微量元素的药用来源。为了进一步研究抗癌药物的作用机理,我们采用电喷雾质谱技术,对三种临床疗效较好的抗癌药物与DNA相互作用进行了系统的研究,确定了复合物的化学计量比及其结合的特异性,并利用竞争实验方法,研究了抗癌药物的相对结合强度。质谱实验结果与液相行为完全一致,其中抗癌药物米托葱醒为首次利用质谱进行研究。最后,采用电喷雾质谱技术,对硝酸盐离子簇合物进行了详细研究,发现了双电荷簇合物离子,并且在离子簇合物中还发现了魔数规律的存在。利用电喷雾多级串联质谱技术,研究了双电荷簇合物离子的质谱裂解规律,并对其稳定性进行了分析。此外,还讨论了溶液浓度和毛细管温度对离子簇合物形成的影响规律。

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The objective of this study was to develop a rapid and efficient system for regenerating shoots from nodal explants of scented geranium (Pelargonium graveolens L. Her. ex Ait: syn. P. roseum willd). Single node stem explants were inoculated in MS media containing different combinations of 6-benzylaminopurine (BAP) with indole-3-acetic acid (IAA) or naphthalene acetic acid (NAA) (0, 0.5, 1.0, 2.0 mg/l) in a 4x4 factorial experiment. Multiple shoots were induced in media supplemented with BAP and IAA, Maximum number of shoots (56 per explant) were observed in the medium containing BAP and IAA at 1 mg/l each, 30 days after inoculation. Micro shoots were subcultured once in every four weeks. Adventitious shoots were induced from in vitro grown leaves and petioles. Several regenerated shoots were rooted on MS half-strength medium supplemented with 0.5 mg/l indole-3-butyric acid (IBA) and the plantlets were hardened in the growth chamber. This micropropagation system could be used for rapid and large-scale production of scented geranium.

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A capillary electrophoresis method coupled with electrochemiluminescence detection for the analysis of quinolizidine alkaloids was established, especially, oxymatrine (OMT) which could not be measured by previous electrochemiluminescence methods was detected sensitively herein. Complete separation of sophoridine (SR), matrine (MT) and OMT was achieved within 13 min using a background electrolyte of 50mM phosphate buffer at pH 8.4 and a separation voltage of 15 kV. The calibration curves showed a linear range from 2.8 x 10(-8) to 4.4 x 10(-7) M for SR, 2.7 x 10(-8) to 4.4 x 10(-7) M for MT.

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I. Gibson