UPCOMING RESEARCH Multiplex Gas Chromatography with a Hollow Fiber Membrane Interface for Determination of Trace Volatile Organic Compounds in Aqueous Samples
Mediated Electrochemical Reduction of Cytochrome cand Tyrosinase at Perfluorosulfonated lonomer-Coated Electrodes
A simple, efficient, solvent-free method for rapid routine d e t e r m i n a t i o n or c o n t i n u o u s m o n i t o r i n g of VOCs i n aqueous samples is described. Min J. Yang and Janusz Pawliszyn*, The Guelph-Waterloo Centre for Graduate Work in Chemistry and the Waterloo Centre for Groundwater Research, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Mediated electron transfer to cytochrome c and tyrosi nase is accomplished a t glassy carbon electrodes with the copper(II) complex of im(pyrazol-l-ylmethyl)amine im mobilized i n Nafion. James W. Furbee, Jr., C. Robin Thomas, and Richard S. Kelly*, Department of Chemistry, Lake Forest College, Lake Forest, IL 60045, and Mitchell R. Malachowski, Department of Chemistry, University of San Diego, San Diego, CA 92110
Simplification of High-Energy Collision Spectra of Peptides by Amino-Terminal Derivatization A t t a c h m e n t of a q u a t e r n a r y a m m o n i u m group to t h e amino-terminus of a peptide increases the sequence information from high-energy CAD fragment ion spectra. John T. Stults*, Johnny Lai, Shannon McCune, and Ronald Wetzel, Protein Chemistry Department, Genentech, Inc., 460 Point San Bruno Blvd., South San Francisco, CA 940804990 Quantitative Analysis in Capillary Zone Electrophoresis Using Ion-Selective Microelectrodes as On-Column Detectors When a n ion-selective microelectrode is used a s a n oncolumn detector in CZE, organic and inorganic cations a r e d e t e r m i n e d q u a n t i t a t i v e l y i n t h e r a n g e of 1 0 ~ 5 10" 3 M with a precision of < 5%. André Nairn*, Ivo Silvestri, and Wilhelm Simon, Department of Organic Chemistry, Swiss Federal Institute of Technology, Universitàtstrasse 16, CH-8092 Zurich, Switzerland Quantitative Determination of Macromolecular Chlorolignosulfonic Acids in Water by Pyrolysis-Gas Chromatography/Mass Spectrometry with Single Ion Monitoring The procedural precision is 1-13%; the procedural accuracy depends primarily on sampling accuracy of the reference pulp mill effluents. The Rhine River in The Nethe r l a n d s c o n t a i n s 1 8 0 - 3 1 0 μ g / L of m a c r o m o l e c u l a r chlorolignosulfonic acids. Willem M.G.M. van Loon* and Jaap J. Boon, FOM- Institute for Atomic and Molecular Physics, Unit for Mass Spectrometry of Macromolecular Systems, Kruislaan 407, 1098 SJ Amster dam, The Netherlands, and Bob de Groot, Water Transport Company Rijn-Kennemerland (WRK), Laboratory for Special Research, Groenendael 6, 3439 LV Nieuwegein, The Nether lands
These articles are scheduled to appear in AC RESEARCH in the n e a r future. *Corresponding author
Electrical Field-Flow Fractionation in Particle Separation. 1. Monodisperse Standards A method is described for performing EFFF. Under typi cal applied potentials of 2 V or less, latex particles in the 60-10,000-nm size range are separated. Karin D. Caldwell* and Yu-Shu Gao, Department of Bioengineering, University of Utah, Salt Lake City, UT 84112 Isotope Ratios of Molybdenum Determined by Thermal Ionization Mass Spectrometry for Stable Isotope Studies of Molybdenum Metabolism in Humans Molybdenum isotope ratios are determined in l ^ g sam ples separated and purified from biological samples col lected in stable isotope tracer studies in humans. Judith R. Turnlund*, William R. Keyes, and Gary L. Peiffer, USDA/ARS, Western Human Nutrition Research Center, P.O. Box 29997, Presidio of San Francisco, CA 94129 Tryptic Mapping of Recombinant Proteins by Matrix-Assisted Laser Desorption/lonization Mass Spectrometry MALDI MS is used to characterize the tryptic maps of recombinant h u m a n growth hormone and recombinant h u m a n tissue plasminogen activator. A matrix mixture containing carbohydrate and 2,5-dihydroxybenzoic acid provides improvement in resolution, ion signal, tolerance to buffer components, and n u m b e r s of components ob served in a mixture. Todd M. Billici and John T. Stults*, Protein Chemistry De partment, Genentech, Inc., 460 Point San Bruno Blvd., South San Francisco, CA 94080 K0 2 Chemical Transformation/Mass Spectrometry Detection of Covalent Damage to the DNA of Cultured Human Lymphocytes Exposed to Benzo[a]pyrene Three chemical steps are conducted sequentially in t h e same vial in a general scheme for detecting diolepoxide PAH DNA adducts a t the picomole/femtomole level with potential for the attomole level. Kariman Allam, Department of Chemistry, Alexandria Uni versity, Alexandria, Egypt, and Samy Abdel-Baky and Roger W. Giese*, Barnett Institute of Chemical Analysis and Materi als Science, Northeastern University, Boston, MA 02115
ANALYTICAL CHEMISTRY, VOL. 65, NO. 11, JUNE 1, 1993 · 517 A
