UPCOMING RESEARCH Adsorption of Catechols on Fractured Glassy Carbon Electrode Surfaces
Surface-Induced Dissociation of Protonated Peptides: Implications of Initial Kinetic Energy Spread
Adsorption on fractured glassy carbon is independent of catechol charge, indicating a fundamentally different ad sorption mechanism from that observed on polished or electrochemically pretreated surfaces. Christie D. Allred and Richard L. McCreery*, Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus, OH 43210
Ion-surface collisions CELAB = 13 e ^ ) produce a wider variety of decompositions t h a n collisions with target gases. The larger breadth of processes is attributed to the wide kinetic energy distribution inherent in FAB desorption. Richard B. Cole, Sylvain LeMeillour, and Jean-Claude Tabet*, Laboratoire de Chimie Organique Structurale, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France and Department of Chemistry, University of New Orleans, Lakefront, New Orleans, LA 70148
Empirical Procedure That Uses Molecular Structure To Predict Enantioselectivity of Chiral Stationary Phases The enantiomeric separation of 121 racemic compounds produced a database t h a t is used to obtain enantioselec tivity contributions for each substituent attached to a stereogenic center. The results can be used to predict whether a racemic compound can be resolved and to de t e r m i n e i t s α-value on naphthylethylcarbamatefunctionalized β-cyclodextrin stationary phases. Alain Berthod, San-Chun Chang, and Daniel W. Arm strong*, Department of Chemistry, University of MissouriRolla, Rolla, MO 65401 Determination of Phospholipids from Pulmonary Surfactant Using an On-Line Coupled Silica/ Reversed-Phase High-Performance Liquid Chromatography System HPLC determination of phospholipids, from pulmonary surfactant with an isocratic system combining normal (silica gel) and reversed-phase columns in series or by a column switching device, is described. Laurent Michel Bonanno, Benoit André Denizot, Pierre Cyril Tchoreloff, Francis Puisieux, and Philippe Jean Cardot*, Laboratoire de Chimie Analytique et d'Electrochimie Organiques and Laboratoire de Biopharmacie et Pharmacotechnie, Centre Pharmaceutique de Chatenay-Malabry, 5 avenue Jean-Baptiste Clément, F92296 Chatenay-Malabry Cedex, France Development and Characterization of a Titanium Dioxide-Based Semiconductor Photoelectrochemical Detector Photoelectrochemical detection of a wide range of organic compounds at illuminated titanium dioxide semiconducting electrodes in a flow injection analysis system is demonstrated with a detection limit of approximately 40 pmol and linearity over 2 orders of magnitude. Garrett N. Brown, John W. Birks, and Carl A. Koval*, Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), Campus Box 216, University of Colorado, Boulder, CO 80309-0216
Quantitative Determination of Catecholamines in Individual Bovine Adrenomedullary Cells by Reversed-Phase Microcolumn Liquid Chromatography with Electrochemical Detection Norepinephrine and epinephrine a r e quantitated a t t h e fmol level in individual cells using a micropacked LC column and amperometric detection. Detection limits are 46 amol for norepinephrine and 75 amol for epinephrine. On average, a single cell contains 150 pmol of total catecholamine. Bruce R. Cooper, Jeffrey A. Jankowski, David J. Leszczyszyn, R. Mark Wightman, and James W. Jorgenson*, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290 Preconcentration of Dopamine by Uphill Transport across an Ion-Exchange Membrane Ionic strength or pH differences across a cation-exchange membrane permit preconcentrations of dopamine by factors of 20.1 ± 0.5 and 21.5 ± 0.4, respectively, in 15 min. James A. Cox* and Nongluck Poopisut, Department of Chemistry, Miami University, Oxford, OH 45056 pH Gradient Capillary Zone Electrophoresis Using a Solvent Program Delivery System The media is consistently supplied through both reservoirs, and the average pH along the column is estimated from the current. The effects of gradient curve selection, gradient duration period, and exchange of media at both reservoirs are discussed. Takao Tsuda, Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466, Japan
These articles are scheduled to appear in AC RESEARCH in the near future. Corresponding author ANALYTICAL CHEMISTRY, VOL. 64, NO. 3, FEBRUARY 1, 1992 · 125 A
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UPCOMING RESEARCH Linear-Sweep Voltammetry in a Cylindrical-Pore Electrode
CΗΕMΤΕCΗ is the
A procedure is reported that determines the transfer co efficient and rate constant for a soluble redox couple from linear-sweep voltammetry in a cylindrical-pore electrode. The methodology employed corrects for distortion effects on the voltammogram caused by ohmic and mass trans fer resistances. John W. Weidner* and Peter S. Fedkiw, Department of Chemical Engineering, North Carolina State University, Ra leigh, NC 27695-7905
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Effects of Analyte Velocity Modulation on the Electroosmotic Flow in Capillary Electrophoresis A theoretical description of the radial concentration pro file and its effect on band shapes is presented and veri fied experimentally. Tshenge Demana, Urmi Guhathakurta, and Michael D. Morris*, University of Michigan, Department of Chemistry, Ann Arbor, MI 48109-1055 Enzymatically Amplified Time-Resolved Fluorescence Immunoassay with Terbium Chelates The advantages of enzymatic amplification and microsec ond time-resolved fluorometry with Tb 3 + chelates are combined in an immunoassay system capable of detecting 150,000 molecules of alpha-fetoprotein. Theodore K. Christopoulos and Eleftherios P. Diamandis*, Department of Clinical Biochemistry, Toronto Western Hospital, 399 Bathurst Street, Toronto, Ontario M5T 2S8, Can ada and Department of Clinical Biochemistry, University of Tor onto, 100 College Street, Toronto, Ontario M5G 1L5, Canada
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Amide and Ester Surface Attachment Reactions for Alkanethioi Monolayers at Gold Surfaces as Studied by Polarization Modulation Fourier Transform Infrared Spectroscopy
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The formation of amide and ester linkages via the gasphase derivatization of a bifunctional alkanethioi mono layer adsorbed onto a gold surface is verified by vibra tional spectroscopy. Robert V. Duevel and Robert M. Corn*, Department of Chemistry, University of Wisconsin, 1101 University Ave., Mad ison, WI 53706
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Detection and Determination of Dilute, Low Molecular Weight Organic Compounds in Water by 500-MHz Proton Nuclear Magnetic Resonance Spectroscopy
1992 Rates
Volatile, low molecular weight organic compounds are de tected a t concentrations below t h e mg/mL level by NMR spectroscopy, without the need for extraction or preconcentration. D. Bruce Fulton, Brian G. Sayer, and Alex D. Bain*, De partment of Chemistry, McMaster University, Hamilton, On tario, Canada L8S 4M1 and Harold V. Malle, Wastewater Technology Centre, 867 Lakeshore Road, P.O. Box 5068, Burl ington, Ontario, Canada L7R 4L7
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ANALYTICAL CHEMISTRY, VOL 64, NO. 3, FEBRUARY 1, 1992 · 127 A
UPCOMING RESEARCH
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Supercritical Fluid Extraction of Polar Analytes Using in Situ Chemical Derivatization Extraction of polar organics from solid samples is enhanced by derivatizing the analytes to less polar species under static SFE conditions. Time for derivatization and extraction can be < 30 min. Quantitative derivatization and extraction are demonstrated for herbicides, microbial phospholipid fatty acids, and wastewater phenolics. Steven B. Hawthorne*, David J. Miller, David E. Nivens, and David C. White, Energy and Environmental Research Center, University of North Dakota, Grand Porks, ND 58202, Departments of Chemistry and Microbiology and the Institute for Applied Microbiology, University of Tennessee, Knoxville, TN 37932, and Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37996-1501 Evaluation of a Thermal Desorption Gas Chromatography Mass Spectrometer: On-Site Detection of Polychlorinated Biphenyls at a Hazardous Waste Site Qualitative and quantitative identification of PCBs in soil/sediment a t a hazardous waste site is described. Field TDGC/MS and laboratory GC/MS data are compared. Albert Robbat, Jr.*, Tyng-Yun Liu, and Brian M. Abraham, Chemistry Department, Trace Measurement Analytical Laboratory, Tufts University, Medford, MA 02155 Counter-Propagation Neural Networks in the Modeling and Prediction of Kovats Indices for Substituted Phenols Counterpropagation neural networks are found to be significantly better t h a n multivariate linear regression equations in the modeling of Kovats indices of a series of substituted phenols. Keith L. Peterson, Division of Science and Mathematics, Wesleyan College, Macon, GA 31297 Separation of Fluoride from Fluoroelastomers by Diffusion in Test Tubes Fluoride is quantitatively separated from water, urine, bone, and cured fluoroelastomer samples as trimethylfluorosilane by diffusion in 5-mL test tubes without the use of grease. Pothapragada Venkateswarlu*, 3M/Industrial Chemical Products Division and 3M/Specialty Adhesives and Chemicals Division, Building 236-2B-11, 3M Center, St. Paul, MN 55144
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ANALYTICAL CHEMISTRY, VOL. 64, NO. 3, FEBRUARY 1, 1992 · 129 A
