Results 81 to 90 of about 410 (110)
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Journal of Separation Science, 2008
AbstractpH‐zone‐refining counter‐current chromatography was successfully applied to the separation of alkaloids from a crude extract of Peganum harmala L. using a multilayer coil planet centrifuge. The experiment was performed with a two‐phase solvent system composed of methyl tert‐butyl ether/THF/water (2:2:3 by volume) where triethylamine (10 mM) was
Xiao, Wang +4 more
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AbstractpH‐zone‐refining counter‐current chromatography was successfully applied to the separation of alkaloids from a crude extract of Peganum harmala L. using a multilayer coil planet centrifuge. The experiment was performed with a two‐phase solvent system composed of methyl tert‐butyl ether/THF/water (2:2:3 by volume) where triethylamine (10 mM) was
Xiao, Wang +4 more
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Journal of Chromatography A, 1996
The use of di-(2-ethylhexyl)phosphoric acid (DEHPA) as a ligand in the stationary phase effectively increased the partition coefficient of polar catecholamines. pH-Zone refining counter-current chromatography of six components, i.e. five catecholamines and one amino acid (DOPA), was successfully performed using a two-phase solvent system composed of ...
Y, Ma, E, Sokoloski, Y, Ito
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The use of di-(2-ethylhexyl)phosphoric acid (DEHPA) as a ligand in the stationary phase effectively increased the partition coefficient of polar catecholamines. pH-Zone refining counter-current chromatography of six components, i.e. five catecholamines and one amino acid (DOPA), was successfully performed using a two-phase solvent system composed of ...
Y, Ma, E, Sokoloski, Y, Ito
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Journal of Separation Science, 2016
Tropane alkaloids are bioactive metabolites with great importance in the pharmaceutical industry and the most important class of natural products found in the Erythroxylum genus. However, these compounds are usually separated by traditional chromatographic techniques, in which the sample is progressively purified in multiple chromatographic steps ...
Rodrigo Alves Soares, Cruz +5 more
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Tropane alkaloids are bioactive metabolites with great importance in the pharmaceutical industry and the most important class of natural products found in the Erythroxylum genus. However, these compounds are usually separated by traditional chromatographic techniques, in which the sample is progressively purified in multiple chromatographic steps ...
Rodrigo Alves Soares, Cruz +5 more
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Journal of Separation Science, 2015
Triterpene acids were extracted from the epidermis of Poria cocos (Schw.) Wolf. These acids were found to inhibit the growth of lung cancer cells in vitro and in vivo. An efficient method for the preparative separation of antitumor triterpene acids was established that involves the combination of pH‐zone‐refining counter‐current chromatography and ...
Hongjing, Dong +7 more
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Triterpene acids were extracted from the epidermis of Poria cocos (Schw.) Wolf. These acids were found to inhibit the growth of lung cancer cells in vitro and in vivo. An efficient method for the preparative separation of antitumor triterpene acids was established that involves the combination of pH‐zone‐refining counter‐current chromatography and ...
Hongjing, Dong +7 more
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Journal of Liquid Chromatography & Related Technologies, 2015
Chelerythrine and sanguinarine are the representative and major active constituents of Macleaya cordata. Few reports regarding the preparative separation of these two alkaloids from this Chinese herbal medicine were found. In the present study, an efficient method was established to separate chelerythrine and sanguinarine from Macleaya cordata by pH ...
Qian Liu +5 more
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Chelerythrine and sanguinarine are the representative and major active constituents of Macleaya cordata. Few reports regarding the preparative separation of these two alkaloids from this Chinese herbal medicine were found. In the present study, an efficient method was established to separate chelerythrine and sanguinarine from Macleaya cordata by pH ...
Qian Liu +5 more
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Journal of Chromatography B, 2015
pH-zone-refining counter-current chromatography technique for the separation of natural and synthetic mixtures has been widely used, especially for organic acids and alkaloids. Phenolic acids are very important compounds due to the potential treatment for a wide variety of diseases. However, there is not a general method for their separation.
Genlai, Dong +3 more
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pH-zone-refining counter-current chromatography technique for the separation of natural and synthetic mixtures has been widely used, especially for organic acids and alkaloids. Phenolic acids are very important compounds due to the potential treatment for a wide variety of diseases. However, there is not a general method for their separation.
Genlai, Dong +3 more
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Separation Science and Technology, 2011
Enrichment and separation of alkaloids from a chloroform extract of Sinomenium acutum has been successfully performed for the first time using pH-zone-refining counter-current chromatography. The two-phase solvent system used for enrichment was composed of Methyl tert-butyl ether (MtBE)–acetonitrile (CH3CN)–water (4:1:5, v/v), where 10 mM triethylamine
Xiao Wang +5 more
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Enrichment and separation of alkaloids from a chloroform extract of Sinomenium acutum has been successfully performed for the first time using pH-zone-refining counter-current chromatography. The two-phase solvent system used for enrichment was composed of Methyl tert-butyl ether (MtBE)–acetonitrile (CH3CN)–water (4:1:5, v/v), where 10 mM triethylamine
Xiao Wang +5 more
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Journal of Chromatography A, 2015
An efficient and target-oriented sample enrichment method was established to increase the content of the minor alkaloids in crude extract by using the corresponding two-phase solvent system applied in pH-zone-refining counter-current chromatography. The enrichment and separation of seven minor indole alkaloids from Uncaria rhynchophylla (Miq.) Miq.
Rui-Hong, Feng +12 more
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An efficient and target-oriented sample enrichment method was established to increase the content of the minor alkaloids in crude extract by using the corresponding two-phase solvent system applied in pH-zone-refining counter-current chromatography. The enrichment and separation of seven minor indole alkaloids from Uncaria rhynchophylla (Miq.) Miq.
Rui-Hong, Feng +12 more
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Latest Trends on the Future of Three-Dimensional Separations in Chromatography
Chemical Reviews, 2021Noor Abdulhussain +2 more
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