Results 221 to 230 of about 111,518 (250)
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Analytica Chimica Acta, 2015
Trends towards portable analytical instrumentation of the last decades have not been equally reflected in developments of portable liquid chromatography (LC) instrumentation for rapid on-site measurements. A miniaturised medium pressure capillary LC (MPLC) system with gradient elution capability has been designed based on a flexible modular ...
Yan Li +7 more
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Trends towards portable analytical instrumentation of the last decades have not been equally reflected in developments of portable liquid chromatography (LC) instrumentation for rapid on-site measurements. A miniaturised medium pressure capillary LC (MPLC) system with gradient elution capability has been designed based on a flexible modular ...
Yan Li +7 more
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Phytochemical Analysis, 2013
ABSTRACTIntroductionLignans and flavonols are the primary constituents of Sinopodophyllum emodi and have been used as cathartic, anthelmintic, chemotherapeutic and anti‐hypertensive compounds. Although these compounds have been isolated, there have been no reports on the separation of 4′‐demethyl podophyllotoxin, podophyllotoxin, deoxypodophyllotoxin ...
Ping, Wang +6 more
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ABSTRACTIntroductionLignans and flavonols are the primary constituents of Sinopodophyllum emodi and have been used as cathartic, anthelmintic, chemotherapeutic and anti‐hypertensive compounds. Although these compounds have been isolated, there have been no reports on the separation of 4′‐demethyl podophyllotoxin, podophyllotoxin, deoxypodophyllotoxin ...
Ping, Wang +6 more
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Journal of Liquid Chromatography & Related Technologies, 2013
Five known chromones were isolated and purified from Saposhnikovia divaricata for the first time by a combination of reverse-phase medium-pressure liquid chromatography (RP-MPLC) and high performance counter-current chromatography (HPCCC). The n-butanol extracts of S.
Li Li +5 more
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Five known chromones were isolated and purified from Saposhnikovia divaricata for the first time by a combination of reverse-phase medium-pressure liquid chromatography (RP-MPLC) and high performance counter-current chromatography (HPCCC). The n-butanol extracts of S.
Li Li +5 more
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The Natural Products Journal, 2019
Background:Stenoloma chusanum (L.) Ching is a Chinese traditional medicinal fern with high total flavonoid and total phenolic content. Traditionally, phenolic compounds were separated by using column chromatography, which is relatively inefficient. </P><P> Objective: This study aims to use an efficient method to separate natural products ...
Tianyun Li +4 more
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Background:Stenoloma chusanum (L.) Ching is a Chinese traditional medicinal fern with high total flavonoid and total phenolic content. Traditionally, phenolic compounds were separated by using column chromatography, which is relatively inefficient. </P><P> Objective: This study aims to use an efficient method to separate natural products ...
Tianyun Li +4 more
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Fuel, 2020
Abstract Polar compounds from three Brazilian crude oils were isolated and separated into seven fractions according to the polarity (low polarity-LP, low medium polarity-LMP, high medium polarity-HMP, high polarity-HP, basic-BAS, acidic-AC) by using hetero-medium pressure liquid chromatography (H-MPLC).
Taynara Rodrigues Covas +7 more
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Abstract Polar compounds from three Brazilian crude oils were isolated and separated into seven fractions according to the polarity (low polarity-LP, low medium polarity-LMP, high medium polarity-HMP, high polarity-HP, basic-BAS, acidic-AC) by using hetero-medium pressure liquid chromatography (H-MPLC).
Taynara Rodrigues Covas +7 more
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Journal of Separation Science, 2018
AbstractThe separation of minor compounds, especially those with similar polarities from a complex sample, remains challenging. In the proposed study, an effective method based on medium‐pressure liquid chromatography and recycling high‐speed counter‐current chromatography was developed for the enrichment and separation of three minor components from ...
Xue Yang +6 more
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AbstractThe separation of minor compounds, especially those with similar polarities from a complex sample, remains challenging. In the proposed study, an effective method based on medium‐pressure liquid chromatography and recycling high‐speed counter‐current chromatography was developed for the enrichment and separation of three minor components from ...
Xue Yang +6 more
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Journal of Separation Science, 2015
Erythrocentaurin is a relatively simple natural product present among the members of Gentianaceae. A preparative method for the isolation of erythrocentaurin from the ethyl acetate fraction of Enicostemma littorale using medium‐pressure liquid chromatography has been reported.
Naila, Hassan +4 more
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Erythrocentaurin is a relatively simple natural product present among the members of Gentianaceae. A preparative method for the isolation of erythrocentaurin from the ethyl acetate fraction of Enicostemma littorale using medium‐pressure liquid chromatography has been reported.
Naila, Hassan +4 more
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International Journal of Peptide and Protein Research, 1984
Using a combination of rapid medium pressure ion exchange chromatography on the cation exchanger Spheron Phosphate‐1000 and the anion exchanger Spheron DEAE‐1000 a number of enzyme fractions of the cellulolytic system of a mutant of the imperfect fungus Trichoderma viride‐reesei were isolated from the cultivation medium.
Z. Hostomské, O. MikeŠ
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Using a combination of rapid medium pressure ion exchange chromatography on the cation exchanger Spheron Phosphate‐1000 and the anion exchanger Spheron DEAE‐1000 a number of enzyme fractions of the cellulolytic system of a mutant of the imperfect fungus Trichoderma viride‐reesei were isolated from the cultivation medium.
Z. Hostomské, O. MikeŠ
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Journal of Liquid Chromatography & Related Technologies, 2012
The two methods of medium-pressure liquid chromatography (MPLC) and high-speed countercurrent chromatography (HSCCC) are compared in the separation and purification of crude extract from Daphne genkwa Sieb. et Zucc. The MPLC method was performed with the mobile phase composed of methanol-0.1% aqueous acetic acid in the gradient elution which yielded ...
Si Liang +3 more
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The two methods of medium-pressure liquid chromatography (MPLC) and high-speed countercurrent chromatography (HSCCC) are compared in the separation and purification of crude extract from Daphne genkwa Sieb. et Zucc. The MPLC method was performed with the mobile phase composed of methanol-0.1% aqueous acetic acid in the gradient elution which yielded ...
Si Liang +3 more
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Journal of Chromatography A, 1991
Abstract Cyanoginosins produced by Microcystis aeruginosa sp. are toxic cyclic heptapeptides with molecular weights of about 1000 dalton. Microcystis aeruginosa strain PCC 7806 proved to synthesize a methylated and non-methylated cyanoginosin-LR.
Josef Cremer +2 more
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Abstract Cyanoginosins produced by Microcystis aeruginosa sp. are toxic cyclic heptapeptides with molecular weights of about 1000 dalton. Microcystis aeruginosa strain PCC 7806 proved to synthesize a methylated and non-methylated cyanoginosin-LR.
Josef Cremer +2 more
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