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UPCOMING RESEARCH GC/On-Column Injection Technique To Detect Dodecyl Hydroperoxides and Their Decomposition Products
To Eliminate Autosampler Vial Confusion
The method, which detects dodecyl hydroperoxides in the presence of oxygenated dodecane thermal decomposition products, can be used to distinguish between thermal stressing and decomposition products. K. T. Reddy, CEPD Group, Research Center, India Petrochem icals Corp. Ltd., Barody, Gujarat, India 391346, N. P. Cernansky*, Department of Mechanical Engineering & Mechanics, Drexel University, Philadelphia, PA 19104, and R. S. Cohen, Department of Mechanical Engineering, Temple University, Philadelphia, PA 19122
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High-Performance Liquid Chromatographic Assay of Taxol
Introducing The New Wheaton Vials and Accessories for Chromatography Brochure.
The method uses a commercially available pentafluorophenyl packing material t h a t h a s greater selectivity for taxol and related taxanes t h a n other reversed-phase m e dia tested. Steven L. Richheimer*, David M. Tinnermeier, and Daniel W. Timmons, Hauser Chemical Research, Inc., Boulder, CO 80301 Ion Chromatographic Separation of Inorganic Anions and Carboxylic Acids on a Mixed-Mode Stationary Phase A stationary phase bonded with ligands containing both reversed-phase and ion-exchange functions is evaluated for the separation of inorganic anions and carboxylic acids. The separation is affected by the type of alkyl group on t h e support, eluant pH and ionic strength, and organic modifier concentration in t h e eluant. Simulta neous determination of inorganic anions and carboxylic acids can be achieved by careful selection of eluant pH and ion strength. Raaidah Saari-Nordhaus* and James M. Anderson, Jr., Alltech Associates, Inc., 2051 Waukegan Road, Deerfield, IL 60015 Processing Analytical Data Obtained from Second-Order Reactions by Using Continuous Reagent Addition A mathematical treatment for kinetic determinations in volving second-order chemical reactions is suitable for a wide range of concentrations and rate constants. This ap proach also allows determination of the second-order rate constant by five different experimental procedures. Antonio Velasco, Manuel Silva, and Dolores PerezBendito*, Department of Analytical Chemistry, Faculty of Sci ences, University of Cordoba, Ε -14004, Cordoba, Spain
—————— Complete selection of glass and plastic autosampler vials with E-Z Reference™ instrument Guide for Vial Selection ^ ^ — ^ ^ — Seals, Caps, Liners, and Crimping Tools ^ ^ — ^ ^ — Glass Apparatus for Sample Preparation and Solvent Purification Specify Wheaton Autosampler Vials... Because not all autosampler vials are alike. To receive your free copy of the Wheaton Vials and Accessories for Chromatography Brochure and a list of distributors nearest you, call 1-609-825-1100 or FAX: 1-609-825-1368.
WHEATON Manufacturers Since 1888 1000 Ν 10ΤΗ STREET MILLVILLE Ν J 08333-2092 USA
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Combined Liquid Chromatography/Electron Paramagnetic Resonance Spectrometry/Electrospray Ionization Mass Spectrometry for Radical Identification The on-line coupling of LC, EPR spectrometry, and MS is described. Applications of the technique for the identifi cation of phenyl and substituted phenyl spin trapped adducts are illustrated. Hideo Iwahashi, Carol E. Parker, Ronald P. Mason, and Kenneth B. Tomer*, Laboratory of Molecular Biophysics, Na tional Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle Park, NC 27709
WHEATOIM AVAILABLE F R O M LEADING LABORATORY DISTRIBUTORS
CIRCLE 120 FOR DEMONSTRATION CIRCLE 121 FOR LITERATURE
ANALYTICAL CHEMISTRY, VOL. 64, NO. 18, SEPTEMBER 15, 1992 · 865 A
