Results 321 to 330 of about 451,179 (362)

Separation of cytokinins by High Pressure Liquid Chromatography

Planta, 1975
A number of cytokinin reference compounds have been successfully separated by High Pressure Liquid Chromatography using columns of pellicular strong cation exchange resin and of pellicular polyamide. On polyamide, all cytokinins were eluted within 10 min with an aqueous buffer but on the cation exchange resin some cytokinins (generally those with bulky
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High-pressure liquid chromatography of steroidal alkaloids

Journal of Chromatography A, 1976
High-pressure liquid chromatography was used to separate the following steroidal alkaloids: tomatidine, solanidine, solasodine, rubijervine, veratramine and jervine. The method was used to prepare crystalline solanidine from a crude mixture of aglycones obtained from Solanum chacoense, and to separate radioactive solanidine from extracts of potato ...
Joseph R. Wagner, Mayo K. Walden, Erich Heftmann, Irving R. Hunter   +3 more
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A fluorescence detector for high-pressure liquid chromatography

Journal of Chromatography A, 1977
We describe a fluorescence spectrophotometer adapted with a micro quartz flow cell to record the output of modern liquid chromatographs. The optical system is double beam in that the light source variations are cancelled out by a second photomultiplier, thus enhancing the sensitivity of the technique. The emission spectra may be scanned by stopping the
W. Slavin, Reginald F. Adams, A.T.Rhys Williams   +2 more
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Forensic aspects of high-pressure liquid chromatography

Journal of Chromatography A, 1976
This paper reviews the applications of high-pressure liquid chromatography (HPLC) to forensic problems, and discusses some of the developments that have taken place in the use of the technique in the Metropolitan Police Laboratory. Preparation of octadecyltrichlorosilane-modified silica is described and some of the chromatographic characteristics of ...
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High-back-pressure liquid chromatography

Journal of Chromatography A, 1982
Abstract The retention behaviour of solutes on various stationary phases was studied by micro-high-performance liquid chromatography using liquefied solvents as the mobile phase. An octadecylsilylated stationary phase discriminates between coplanar and non-planar aromatic hydrocarbons in the normal-phase system using isobutane as the mobile phase ...
Daido Ishii, Toyohide Takeuchi
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Method transfer from high-pressure liquid chromatography to ultra-high-pressure liquid chromatography. I. A thermodynamic perspective

Journal of Chromatography A, 2014
This is the first investigation in a series that aims to enhance the scientific knowledge needed for reliable analytical method transfer between HPLC and UHPLC using the quality by design (QbD) framework. Here, we investigated the differences and similarities from a thermodynamic point of view between RP-LC separations conducted with 3.5μm (HPLC) and 1.
Krzysztof Kaczmarski, Dennis Åsberg, Marek Leśko, Jörgen Samuelsson, Torgny Fornstedt   +4 more
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Pressurized solvent reservoir for high-pressure liquid chromatography [PDF]

Journal of Chemical Education, 1982
A pressurized solvent reservoir for high-pressure liquid chromatography that slightly pressurizes the mobile phase before entry into the pumping system and also filters the liquid at the same time.
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High Pressure Liquid Chromatography of Eicosanoids

1985
Arachidonic acid (20:4) and other polyunsaturated fatty acids can be oxygenated in many tissues by cyclooxygenase or a variety of lipoxygenases. The intermediates formed in these reactions are then converted enzymatically to a variety of other products.
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Analysis of vitamin A in eggs by high pressure liquid chromatography

Food / Nahrung, 1991
AbstractA high speed liquid chromatographic method was described for the rapid determination of vitamin A in eggs. After saponification and extraction, the sample was separated on a reversed‐phase column (C18) with acetonitrile ‐ methylene‐chloride ‐ methanol as the mobile phase. Quantitative determination was accomplished by monitoring the ultraviolet
Hisil Y., Ötles S.
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High-pressure liquid chromatography of androgens

Journal of Chromatography A, 1979
Erich Heftmann, Mayo K. Walden, Iriving R. Hunter   +2 more
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