Výsledky vyhledávání - "John S. Loran"

Systematic approach to the treatment of enantiomeric separations in capillary electrophoresis and liquid chromatography III. A binding constant-retention factor relationship and effects of acetonitrile on the chiral separation of tioconazole

Autor: Paul D. Ferguson, John S. Loran, David M. Goodall

Publikováno v: Journal of Chromatography A. 745:25-35

In previous chiral CE work on the separation of tioconazole enantiomers by β-cyclodextrin, the mode of action of alcohols as organic modifiers has been elucidated. Using acetonitrile, an increase in the organic modifier concentration in the range 0�

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cf9f8a1cc41e7a747a4c853a609bf4d6
https://doi.org/10.1016/0021-9673(96)00274-9

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Capillary Electrophoresis with Chiral Selectors: Optimization of Separation and Determination of Thermodynamic Parameters for Binding of Tioconazole Enantiomers to Cyclodextrins

Autor: Edmund T. Bergström, Sharron G. Penn, David M. Goodall, John S. Loran

Publikováno v: Analytical Chemistry. 66:2866-2873

A systematic approach is outlined for optimization of enantiomeric separations in free solution capillary electrophoresis using chiral mobile-phase additives. Maximum electrophoretic mobility difference between the enantiomers occurs when the concent

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::542f7fb8ddebaccc887393befec03f3f
https://doi.org/10.1021/ac00090a012

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Systematic approach to treatment of enantiomeric separations in capillary electrophoresis and liquid chromatography

Autor: David M. Goodall, John S. Loran, Gaoyuan Liu, Sharron G. Penn, Edmund T. Bergström

Publikováno v: Journal of Chromatography A. 680:147-155

A systematic approach is outlined for treatment of enantiomeric separations in capillary electrophoresis (CE) and liquid chromatography (LC) using chiral mobile phase additives. General equations and data analysis methods are presented to relate mobi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::51667552076460028a01ea880f5440ca
https://doi.org/10.1016/0021-9673(94)80062-6

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Systematic Approach to Links between Separations in MEKC and Reversed-Phase HPLC

Autor: John S. Loran, Paul D. Ferguson, David M. Goodall

Publikováno v: Analytical chemistry. 70(19)

Retention factors and partition coefficients in micellar electrokinetic chromatography (MEKC) and reversed-phase high-performance liquid chromatography (RP-HPLC) are compared for a series of alkylbenzenes and substituted phenols. In both techniques,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::092ebb936638df548dcd8abfdd793bc1
https://pubmed.ncbi.nlm.nih.gov/21651241

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Quantification of trace levels of ?-cyclodextrin and substitution patterns in hydroxypropyl-?-cyclodextrin using high-performance liquid chromatography with polarimetric detection

Autor: John S. Loran, Gaoyuan Liu, David M. Goodall

Publikováno v: Chirality. 5:220-223

A high-performance liquid chromatographic (HPLC) method has been developed for separation and determination of components in hydroxypropyl-β-cyclodextrin (HP-β-CD). The method involves separation on an amino-bonded HPLC column using water–acetoni

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7734135abedd17fd3815044a0b33d739
https://doi.org/10.1002/chir.530050405

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Differential binding of tioconazole enantiomers to hydroxypropyl-beta-cyclodextrin studied by capillary electrophoresis

Autor: David M. Goodall, John S. Loran, Sharron G. Penn

Publikováno v: Journal of chromatography. 636(1)

Capillary electrophoresis has been used to determine binding constants of tioconazole enantiomers with hydroxypropyl-beta-cyclodextrin (HP-beta-CD), after correcting for changes in mobility with increasing viscosity. The predicted and observed values

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3bb7d96c0135006affb8223302945d7
https://pubmed.ncbi.nlm.nih.gov/8491834

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Aminolysis and base-catalysed hydrolysis of aryl phenylphosphonamidates and amidothionates: reactions close to the E1cB–bimolecular nucleophilic mechanistic borderline

Autor: John S. Loran, Kenneth T. Douglas, Andrew Williams

Publikováno v: J. Chem. Soc., Perkin Trans. 2. :1010-1016

Trapping experiments with amine nucleophiles of high negative Bronsted-type exponent confirm that O-aryl NP-diphenylphosphonamidates [PhPO(NPh)OAr] release phenolate in base via an E1cB process. The corresponding phosphonamidothionates, however, hydr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5de10d093a064a8d61ac5bb5891e8389
https://doi.org/10.1039/p29750001010

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