共查询到20条相似文献,搜索用时 8 毫秒
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《液相色谱法及相关技术杂志》2012,35(12):2399-2408
Abstract High-speed countercurrent chromatography was successfully applied to the separation of alkaloids from two medicinal herbs. Matrine and oxymatrine were isolated from the root of Sophora flavescens Ait with a two-phase solvent system composed of chloroform-0.07 M sodium phosphate (pH 6.4), while atropine and scopolamine were purified from the flowers of Datura mete L. with a similar solvent system by modifying the phosphate buffer pH at 6.5. Identification of each alkaloid was made by either TLC or paper partition chromatography using authentic pure compounds. 相似文献
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高速逆流色谱与硅胶柱色谱结合分离制备高纯度芦荟素异构体 总被引:6,自引:0,他引:6
芦荟素是芦荟叶中主要的蒽醌类成分,通常以芦荟素A和B两种非对映异构体形式并存,目前已成为许多芦荟产品质量控制指标之一。采用高速逆流色谱和硅胶柱色谱结合的方法,从老芦荟干粉中分离制备了高纯度的芦荟素A(纯度为98%)和芦荟素B(纯度为96%)样品,并采用快原子轰击质谱(FAB-MS)和核磁共振氢谱(1H NMR)以及GOESY(gradient-enhanced nuclear Overhauser effect spectroscopy)等方法对所得的两个芦荟素异构体的立体构象进行了确认。该法具有制备量大和分离效率高的特点。 相似文献
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pH-Zone-refining countercurrent chromatography (CCC) is a recently developed new preparative separation method based on conventional CCC. The method uses a retainer base (or acid) in the stationary phase to retain the analyses in the column and an eluent acid (or base) to elute the analyses according to their pKa values and hydrophobicities. It produces a succession of highly concentrated rectangular peaks with minimum overlap similar to those observed in displacement chromatography. pH-zone-refining CCC has important advantages over the conventional CCC including an over 10-fold increase (up to 10 gram or more) in sample loading capacity, high concentration of fractions, and concentration of minor impurities. pH-zone-refining CCC has been successfully applied to the preparative separation of a variety of compounds including both acidic and basic derivatives of amino acid, hydroxyxanthene dyes, peptides, alkaloids, indole auxins, structural, geometrial and optical isomers. 相似文献
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《液相色谱法及相关技术杂志》2012,35(12):2221-2238
Abstract Countercurrent chromatography (CCC) has been successfully applied for the separation of four chlorinated s-triazine derivatives, namely, simazine, atrazine, propazine, and trietazine, which are widely used as herbicides. Of several solvent systems investigated, n-hexane-ethyl acetate-methanol-water (8:2:5:5) gave the best range of the partition coefficient values because of the satisfactory solubility for all samples and therefore was used for the separation of s-triazines. Two types of countercurrent chromatographs, high speed CCC, and horizontal flow-through coil planet centrifuge, were used for s-triazines separation, and the identity of the separated fractions was unequivocally established by mass spectrometry. The potential practical application of CCC to herbicide analysis is discussed. 相似文献
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High-speed countercurrent chromatography (HSCCC) is a special liquid-liquid partition chromatography without solid support matrix. It eliminates irreversible adsorption of sample in the conventional chromatographic method and has been successfully used for analysis and separation of various kinds of natural products. 相似文献
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《液相色谱法及相关技术杂志》2012,35(12):2309-2328
Abstract Performance of two countercurrent chromatographic models, high speed countercurrent chromatograph (HSCCC-4000) and analytical toroidal coil centrifuge (TCC), is evaluated in terms of theoretical plate number, resolution factor and separation time to assess their analytical capability. A series of experiments was conducted to investigate the effects of internal diameter and length of the coiled column, and flow rate of the mobile phase on the separation of indole auxins in two-phase solvent systems composed of n-hexane-ethyl acetate-methanol-water at different volume ratios. The three components of indole auxins were completely resolved in 16 min with a HSCCC system equipped with a multilayer coil of a 0.55 mm I.D. PTFE tube with theoretical plates ranging from 1290 to 829. Similar separation was achieved in 24 min with a TCC systems equipped with a 0.3 mm I.D. PTFE tube with theoretical plates ranging from 1811 to 969. It is concluded that both systems have comparable analytical capability at the present stage of development. 相似文献
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《液相色谱法及相关技术杂志》2012,35(12):2239-2251
Abstract Countercurrent chromatography (CCC) was chosen for study as an isolation technique for pesticides and the impurities found with them, because its high capacity makes possible comparatively large batches of purified materials and because its mild operating conditions minimize the danger of degradation during the separation. Technical grade fenthion, an organophosphorus insecticide, showed traces of six impurities. The principal one found in an analytical standard fenthion was identified as 3-methyl-4-(methylthio)anisole, well separated from the fenthion. The n-octyl ester of the herbicide 2,4,5-T was easily separated from the methyl ester impurity. 相似文献
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应用高速逆流色谱法对同分异构体的分离纯化进行研究。实验结果表明,以正己烷-乙酸乙酯-水(体积比为1∶10∶10)为两相溶剂系统,上相为固定相,下相为流动相,进行二次高速逆流色谱分离,可从茶多酚中分离出g级的儿茶素同分异构体——(-)-表没食子儿茶素没食子酸酯(EGCG)和(-)-没食子儿茶素没食子酸酯(GCG),其高效液相色谱纯度均在98%以上。选择四氯化碳-氯仿-甲醇-水(体积比为7∶3∶7∶3)为溶剂系统,下相为固定相,上相为流动相,经一次高速逆流色谱即可将药物中间体溴代苯胺同分异构体进行有效的分离。 相似文献
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D. A. Fesenko I. I. Fadeeva T. N. Il'inskaya M. E. Perel'son O. M. Tolkachev 《Chemistry of Natural Compounds》1973,7(2):150-154
Summary A new hasubanan alkaloid with the composition C29H33O9N, mp 128–129°C9 from ether), []
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– 25° (c 2; ethanol) containing an ester group has been isolated from the herbStephania hernandifolia and has been called hernandifoline.All-Union Scientific-Research Institute for Medicinal Plants. Translated from Khimiya Prirodynkh Soedinenii, No. 2, pp. 158–164, March, 1971. 相似文献
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I. I. Fadeeva D. A. Fesenko T. N. Il'inskaya M. E. Perel'son O. N. Tolkachev 《Chemistry of Natural Compounds》1973,7(4):432-434
Summary A new hasubanan alkaloid with the composition C20H27O6N, mp 152–153°C (ether-methanol) has been isolated from the herbStephania hernandifolia and has been called methylhernandine. The alkaloid has been shown to be identical with the methylamino alcohol obtained in the hydrolysis of hernandifoline.All-Union Scientific Research Institute of Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 455–457, July–August. 相似文献
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T. N. Il'inskaya M. E. Perel'son I. I. Fadeeva O. N. Tolkachev 《Chemistry of Natural Compounds》1975,9(5):613-615
Summary From the epigeal part ofStephania delovayi Diels (Menispermaceae) have been isolated cycleanine and a new amorphous alkaloid, stephodeline, with the composition C21H27O5N, a structure for which is proposed.All-Union Scientific-Research Institute of Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 650–653, September–October, 1973. 相似文献
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Summary The structure of the new alkaloid isostephodeline isolated from the roots ofStephania delavayi Diels has been established. The most probable relative configurations of isostephodeline and of the stephodeline isolated previously have been proposed.All-Union Scientific-Research Institute of Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 188–193, March–April, 1975. 相似文献
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T. N. Il'inskaya D. A. Fesenko I. I. Fadeeva M. E. Perel'son O. N. Tolkachev 《Chemistry of Natural Compounds》1973,7(2):171-174
Summary The epigeal part ofStephania hernandifolia has given a new hasubanan alkaloid with the composition C19H25O6N, mp 197–199°C (ethanol), []
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-33° (c 1.8; ethanol), which has been called hernandine, and for which a partial structure has been proposed.All-Union Scientific-Research Institute for Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 180–184, March, 1971. 相似文献