Gary J. Van Berkel
Distinguished Research Scientist and Group Leader

Refereed Publications

(116) Van Berkel, G. J.; Kertesz, V."Electrochemically Initiated Tagging of Thiols Using an Electrospray Ionization-Based Liquid microjunction Surface Sampling Probe Two-Electrode Cell" Submitted to Rapid Commun. Mass Spectrom.

(115) Kertesz, V.; Van Berkel, G. J. "Improved DESI-MS Performance using Edge Sampling and a Rotational Sample Stage," Rapid Commun. Mass Spectrom., 2008, 22, 3846-3850.

(114) Kertesz, V.; Van Berkel, G. J. "Improved Imaging Resolution in Desorption Electrospray Ionization Mass Spectrometry," Anal. Chem., 2008, 22, 2639-2644.

(113) Van Berkel, G.J.; Pasilis, S. P.; Ovchinnikova, O. "Established and Emerging Atmospheric Pressure Surface Sampling/Ionization Techniques for Mass Spectrometry," J. Mass Spectrom., 2008, 43, 1161 - 1180.

(112) Kertesz, V.; Van Berkel, G. J.; Vavrek, M.; Koeplinger, K. A.; Schneider, B.B.; Covey, T. R. "Comparison of Drug Distribution Images from Whole-Body Thin Tissue Sections Obtained Using Desorption Electrospray Ionization Tandem Mass Spectrometry and Autoradiography," Anal. Chem., 2008, 80, 5168-5177.

(111) Pasilis, S. P.; Kertesz, V.; Van Berkel, G. J.; Schulz, M.; Schorcht, S. "HPTLC/DESI-MS Imaging of Tryptic Protein Digests Separated in Two Dimensions," J. Mass Spectrom. 2008, 43, 1627-1635.

(110) Pasilis, S. P.; Kertesz, V.; Van Berkel, G. J.; Schulz, M.; Schorcht, S. "Using HPTLC/DESI-MS for Peptide Identification in 1D Separations of Tryptic Protein Digests," Anal. Bioanal. Chem., 2008, 391, 317-324.

(109) Pasilis, S. P.; Kertesz, V.; Van Berkel, G. J. "Unexpected Analyte Oxidation during Desorption Electrospray Ionization - Mass Spectrometry," Anal. Chem. 2008, 80, 1208-1214.

(108) Kertesz, V.; Van Berkel, G. J. "Scanning and Surface Alignment Considerations in Chemical Imaging with Desorption Electrospray Mass Spectrometry," Anal. Chem. 2008, 80, 1027-1032.

(107) Jackson, A.; Talaty, N.; Cooks, R. G.; Van Berkel, G. J. "Salt Tolerance of Desorption Electrospray Ionization (DESI)," J. Am. Soc. Mass Spectrom. 2007, 18, 2218-2225.

(106) Van Berkel, G. J.; Kertesz, V.; Koeplinger, K. A.; Vavrek, M.; Kong, A. T. "Liquid Micro-Junction Surface Sampling Probe Electrospray Mass Spectrometry for Detection of Drugs and Metabolites in Thin Tissue Sections," J. Mass Spectrom. 2008, 43, 500-508.

(105) Pasilis, S. P.; Kertesz, V.; Van Berkel, G. J. "Surface Scanning Analysis of Planar Arrays of Analytes with Desorption Electrospray Ionization - Mass Spectrometry" Anal Chem., 2007 79, 5956-5962.

(104) Van Berkel, G. J.; Kertesz, V. "Using the Electrochemistry of the Electrospray Ion Source," Anal. Chem., 2007, 79, 5510-5520.

(103) Levitskaia, T. G.; Maya, L.; Van Berkel, G. J.; Moyer, B. A. "Anion Partitioning and Ion-Pairing Behavior of Anions in the Extraction of Cesium Salts by 4,5' '-Bis(tert-octylbenzo)dibenzo-24-crown-8 in 1,2-Dichloroethane." Anal Chem., 2007, 79, 261-272.

(102) Van Berkel, G. J.; Tomkins, B. A.; Kertesz, V. "Thin-Layer Chromatography/Desorption Electrospray Ionization Mass Spectrometry: Investigation of Goldenseal Alkaloids," Anal. Chem. 2007, 79, 2778-2789.

(101) Clark, W. J., Jr.; Park, S. H.; Bostick, D. A.; Duckworth, D. C.; Van Berkel, G. J. "Electrochemically-Modulated Separation, Concentration, and Detection of Plutonium Using an Anodized Glassy Carbon Electrode and Inductively Coupled Plasma Mass Spectrometry," Anal. Chem., 2006, 78, 8535-8542.

(100) Van Berkel, G. J.; Kertesz, V. “Automated Sampling and Imaging of Analytes Separated on Thin-Layer Chromatography Plates Using Desorption Electrospray Ionization Mass Spectrometry.” Anal. Chem. 2006, 78, 4938-4944..

(99) Eckenrode, B.A.; Ramsey, S.A.; Stockham, R.A.; VanBerkel, G.J.; Asano, K.G.; Wolf, D.A. “Performance Evaluation of the Scent Transfer UnitTM (STU) for Organic Compound Collection and Release.” J. Forensic Sci. 2006, 51, 780-789.

(98) Tomkins, B.A.; VanBerkel, G.J.; Jenkins, R.A.; Counts, R.W. "Quantitation of Cotinine in Nonsmoker Saliva using Chip-Based Nanoelectrospray Tandem Mass Spectrometry." J. Anal. Tox. 2006, 30, 178-186.

(97) Van Berkel, G. J.; Ford, M. J.; Doktycz, M. J.; Kennel, S. J. “Evaluation of a Surface Sampling Probe Electrospray Mass Spectrometry System for the Analysis of Surface Deposited and Affinity Captured Proteins.” Rapid Commun. Mass Spectrom., 2006, 20,1144-1152.

(96) Van Berkel, G. J.; Kertesz, V. “Novel Use of a Battery-Powered Two-Electrode Emitter Cell for Electrospray Mass Spectrometry,” J. Am. Soc. Mass Spectrom., in press.

(95) Van Berkel, G. J.; Kertesz, V. “Expanded Electrochemical Capabilities of the Electrospray Ion Source using Porous Flow-Through Electrodes as the Upstream Ground and Emitter High Voltage Contact,” Anal. Chem., 2005, 77, 8041-8049

(94) Kertesz, V.; Ford, M. J.; Van Berkel, G. J. "Automation of a Surface Sampling Probe/Electrospray Mass Spectrometry System," Anal. Chem. 2005, 77, 7183-7189.

(93) Asano, K. G.; Ford, M. J.; Tomkins, B. A.; Van Berkel, G. J. "Self-Aspirating Atmospheric Pressure Chemical Ionization Source for Direct Sampling of Analytes on Surfaces and in Liquid Solutions," Rapid Commun. Mass Spectrom. 2005, 19, 2305-2312.

(92) Ford, M. J.; Deibel, M. A.; Tomkins, B. A.; Van Berkel, G. J. "Quantitative Thin-Layer Chromatography/Mass Spectrometry Analysis of Caffeine using a Surface Sampling Probe Electrospray Ionization Tandem Mass Spectrometry System," Anal. Chem. 2005, 77, 4385-4389.

(91) Kertesz, V.; Van Berkel G. J.; Granger, M. C. "Study and Application of a Controlled-Potential Electrochemistry - Electrospray Emitter for Electrospray Mass Spectrometry," Anal. Chem., 2005, 77, 4366-4373.

(90) Cable-Dunlap, P.; DeGange, J. J.; Nichols, L. S.; Duckworth, D. C.; Park, S. H.; Van Berkel, G. J. "Interface of a Particle Collector with an On-Line Electrochemically-Modulated Separation System for Analysis of Airborne Radioisotopes," J. Radioanal. Nuc. Chem. 2005, 263, 177-181.

(89) Van Berkel, G. J.; Ford, M. J.; Deibel, M. A. "Thin Layer Chromatography and Mass Spectrometry Coupled using Desorption Electrospray Ionization," Anal. Chem., 2005, 77, 1207-1215.

(88) VerBerkmoes, N. C.; Hervey, W. J.; Shah, M.; Land, M.; Hauser, L.; Larimer, F. W.; Van Berkel, G. J.; Goeringer, D. E. "Evaluation of "Shotgun" Proteomics for Identifcatin of Biological Threat Agents in Complex Environmental Matirces: Experiemntal Simulations," Anal. Chem., 2005, 77, 923-932.

(87) Ford, M. J.; Kertesz, V.; Van Berkel, G. J. "Thin Layer Chromatography/Electrospray Ionization Triple Quadrupole Linear Ion Trap Mass Spectrometry System: Analysis of Rhodamine Dyes Separated on Reversed Phase C8 Plates," J. Mass Spectrometry, 2005, in press.

(86) Kertesz, V.; Van Berkel, G.J. "Monitoring Ionic Adducts to Elucidate Reactions Mechanisms: Reduction of Tetracyanoquinodimethane (TCNQ) and the Oxidation of Triphyenylamine (TPA) Investigated Using On-Line Electrochemistry/Electrospray Mass Spectrometry," Solid State Electrochem., in press.

(85) Van Berkel, G. J.; Kertesz, V.; Ford, M. J.; Granger, M. C. "Efficient Analyte Oxidation in an Electrospray Ion Source Using a Porous Flow-Through Electrode Emitter," J. Am. Soc. Mass Spectrom. 2004, 15, 1755-1766.

(84) Ford, M. J.; Van Berkel, G. J. "An Improved Thin-Layer Chromatography/Mass Spectrometry Coupling Using a Surface Sampling Probe Electrospray Ion Trap System," Rapid Commun. Mass Spectrom. 2004, 18, 1303-1309.

(83) Geyer, R.; Peacock, A. D.; White, D. C.; Lytle, C.; Van Berkel, G. J. Atmospheric Pressure Chemical Ionization and Atmospheric Pressure Photoionization for Simultaneous Mass Spectrometric Analysis of Microbial Respiratory Ubiquinones and Menaquinones," J. Mass Spectrom. 2004, 39, 922-929.

(82) Van Berkel, G. J.; Asano, K. G.; Granger, M. C. "Controlling Analyte Electrochemistry in Electrospray Using a Three-Electrode Emitter Cell," Anal. Chem. 2004, 76, 1493-1499.

(81) Van Berkel, G. J.; Llave, J. J.; Apadoca, M. F.; Ford, M. J. "Rotation Planar Chromatography Coupled On-Line with Atmospheric Pressure Chemical Ionization Mass Spectrometry," Anal. Chem. 2004, 76, 479-482.

(80) Keller, K. M.; Brodbelt, J. S.; Hettich, R. L.; Van Berkel G. J. "Comparison of SORI-CAD and MSAD for Top-Down Protein Analysis," J. Mass Spectrom. 2004, 39, 402-411.

(79) Van Berkel, G. J. "An Overview of Some Recent Developments in Ionization Methods for Mass Spectrometry," Eur. J. Mass Spectrom., 2003, 9, 539-562.

(78) Van Berkel G.J.; Sanchez, A. D.; Quirke, J. M. E. "Thin-Layer Chromatography and Electrospray Mass Spectrometry Coupled using a Surface Sampling Probe," Anal. Chem. 2002, 74, 6216-6223.

(77) Van Berkel G.J.; Asano, K. G.; Kertesz, V. "Enhanced Study and Control of Analyte Oxidation in Electrospray Using a Planar-Electrode Emitter," Anal. Chem. 2002, 74, 5047-5056.

(76) Ketesz, V.; Deng, H.; Asano, K. G.; Hettich, R. L.; Van Berkel, G. J; "N-Phenyl-1,4-Phenylenediamine and Benzidine Oxidation Products Identified Using On-Line Electrochemistry/Electrospray Fourier Transform Mass Spectrometry," Electroanalysis 2002, 14, 1027-1030.

(75) Kertesz, V.; Van Berkel, G. J. "Surface-Assisted Reduction of Aniline Oligomers, "N-Phenyl-1,4-Phenylenediamine and Thionin in Atmospheric Pressure Chemical Ionization and Atmospheric Pressure Photoionization," J. Am. Soc Mass Spectrom. 2002, 13, 109-117.

(74) Quirke, J. M. E.; Van Berkel G. J. "Electrospray Tandem Mass Spectrometric Study of Alkyl 1-Methylpyridinium Ether Derivatives of Alcohols," J. Mass Spectrom. 2001, 36, 1294-1300.

(73) Kertesz, V.; Dunn, N. M.; Van Berkel, G. J. "Electrochemistry/Electrospray Mass Spectrometry Study of Cesium Uptake in Nickel Hexacyanoferrate Films," Electrochimica Acta 2002, 47, 1035-1042.

(72) Kertesz, V.; Van Berkel, G. J. "Electropolymerization of Methylene Blue Investigated Using On-Line Electrochemistry/Electrospray Mass Spectrometry," Electroanalysis 2001, 13, 1425-1430.

(71) Van Berkel, G. J; Kertesz, V. "Redox Buffering in an Electrospray Ion Source using a Copper Capillary Emitter," J. Mass Spectrom. 2001, 36, 1125-1132.

(70) Van Berkel, G. J.; Asano, K. G.; Schnier, P. D.; "Electrochemical Processes in a "Wire in a Capillary" Bulk-Loaded, Nano-Electrospray Emitter," J. Am. Soc. Mass Spectrom. 2001, 12, 853-862.

(69) Kertesz, V.; Van Berkel, G. J. "Minimizing Analyte Electrolysis in an Electrospray Emitter," J. Mass Spectrom. 2001, 36, 204-210.

(68) Quirke, J. M. E.; Van Berkel, G. J. "Electrospray Tandem Mass Spectrometric Study of Ferrocene Carbamate Ester Derivatives of Primary, Secondary, and Tertiary Alcohols," J. Mass Spectrom. 2001, 36, 179-187.

(67) Quirke, J. M. E.; Van Berkel, G. J. "Selective Detection of Derivatized Alcohols and Phenols in Essential Oils by Electrospray-Tandem Mass Spectrometry," J. Essential Oil Res. 2001, 13, 324-331.

(66) Van Berkel, G. J. "Insights into Analyte Electrolysis in an Electrospray Emitter from Chronopotentiometry Experiments and Mass Transport Calculations," J. Am. Soc. Mass Spectrom. 2000, 11, 951-960.

(65) De la Mora, J. F.; Van Berkel, G. J.; Enke, C. G.; Cole, R. B.; Martinez-Sanchez, M.; Fenn, J. B. "Electrochemical Processes in Electrospray Ionization Mass Spectrometry," J. Mass Spectrom. 2000, 35, 939-952.

(64) Kavallieratos, K.; Danby, A.; Van Berkel, G. J.; Kelley, M. A.; Sachleben, R. A.; Moyer, B. A.; Bowman-James, K. "Tris (2-aminioethyl)amine (tren) Triamide Derivatives Enhance CsNO3 Extraction in 1,2-Dichloroethane via a Dual-host Strategy," Anal. Chem. 2000, 72, 5258-5264.

(63) Van Berkel, G. J.; Quirke, J. M. E.; Adams, C. L. "Derivatization for Electrospray Ionization-Mass Spectrometry. 4. Alkenes and Alkynes," Rapid. Comm. Mass Spectrom. 2000, 14, 849-858.

(62) Deng, H,; Van Berkel, G. J.; Takano, H.; Gazda, D., Porter, M. D. "Electrochemically-Modulated Liquid Chromatography Coupled On-line with Electrospray Mass Spectrometry," Anal. Chem. 2000, 72, 2641-2647.

(61) Van Berkel, G. J. "Electrolytic Deposition of Metals onto the High Voltage Contact in an Electrospray Emitter: Implications for Gas-Phase Ion Formation," J. Mass Spectrom. 2000, 35, 773-783.

(60) Quirke, J. M. E.; Hsu, Y-L.; Van Berkel, G. J. "Ferrocene-Based Electroactive Derivatizing Reagents for the Rapid Selective Screening of Alcohols in Natural Product Mixtures Using Electrospray Tandem Mass Spectrometry," J. Nat. Prod. 2000, 63, 230-237.

(59) Kavallieratos, K.; Sachleben, R..A.; Van Berkel, G. J.; Moyer, B. A. "Novel Dual-Host Approach in Ion Pair Extraction - A Simple Tripodal Anion Host Facilitates CsNO3 Transfer to 1,2 Dichloroethane by a Large Crown Ether," Chem. Comm. 2000, 187-188.

(58) Pretty, J. R.; Deng, H.; Goeringer, D. E.; Van Berkel, G. J. "Electrochemically-Modulated Preconcentration and Matrix Elimination for Organic Analytes Coupled On-Line with Electrospray Mass Spectrometry," Anal. Chem. 2000, 72, 2066-2074.

(57) Deng, H.; Van Berkel, G. J. "Electrochemical Polymerization of Aniline Investigated using On-Line Electrochemistry/Electrospray Mass Spectrometry," Anal. Chem. 1999, 71, 4284-4293.

(56) Van Berkel, G. J.; Giles, G. E.; Bullock, J. S., IV; Gray, L. J. "Novel Computational Simulation of Redox Reactions within a Metal Electrospray Emitter," Anal. Chem. 1999, 71, 5288-5296.

(55) Zhou, S.; Edwards, A.; Cook, K. D.; Van Berkel, G. J. "Investigation of the Electrospray Plume by Laser-Induced Fluorescence Spectroscopy," Anal. Chem. 1999, 71, 769-776.

(54) Deng, H.; Van Berkel, G. J. "A Thin-Layer Flow Cell Coupled On-Line with Electrospray-Mass Spectrometry for the Study of Biological Redox Reactions," Electroanalysis 1999, 11, 857-865.

(53) Pretty, J. R.; Van Berkel, G. J. "Electrochemical Sample Pretreatment Coupled On-Line with Electrospray Mass Spectrometry for Enhanced Elemental Analysis," Rapid Commun. Mass Spectrom. 1998, 12, 1644-1652.

(52) Deng, H,; Van Berkel, G. J. "Electrospray Mass Spectrometry and UV/Visible Spectrophotometric Studies of Aluminum(III)-Flavonoid Complexes," J. Mass Spectrom. 1998, 33,1080-1087.

(51) Van Berkel, G. J. "Electrolytic Corrosion of a Stainless Steel Electrospray Emitter Monitored using an Electrospray-Photodiode Array System," J. Anal. At. Spectrom. 1998, 13, 63-607.

(50) Pretty, J. R.; Van Berkel, G. J.; Duckworth, D. C. "Adsorptive Stripping Voltammetry as a Sample Pretreatment Method for Trace Uranium Determinations by Inductively Coupled Plasma Mass Spectrometry," Int. J. mass Spectrom. Ion Processes 1998, 178, 51-63.

(49) Van Berkel, G. J.; Quirke, J. M. E.; Dilley, A.; Tigani, R.;Covey, T. R. "Derivatization for Electrospray Ionization Mass Spectrometry. 3. Electrochemically-Ionizable Derivatives," Anal. Chem. 1998, 70, 1544-1554.

(48) Pretty, J. R.; Duckworth, D. C.; Van Berkel, G. J. "Electrochemical Sample Pretreatment Coupled On-Line with ICP-MS: Analysis of Uranium using an Anodically Conditioned Glassy Carbon Working Electrode," Anal. Chem. 1998, 70, 1141-1148.

(47) Pretty, J. R.; Duckworth, D. C.; Van Berkel, G. J. "Anodic Stripping Voltammetry Coupled On-Line with Inductively Coupled Plasma Mass Spectrometry: Optimization of a Thin-Layer Flow Cell System for Analyte Signal Enhancement," Anal. Chem. 1997, 69, 3544-3551.

(46) Stephenson, J. L.; Van Berkel, G. J.; McLuckey, S. A. "Ion/ion Proton Transfer Reactions of Bio-ions Involving Non-Covalent Interactions: Holomyoglobin," J. Am. Soc. Mass Spectrom. 1997, 8, 637-644.

(45) Van Berkel, G. J.; Zhou, F.; Aronson, J. T. "Changes in Bulk Solution pH Caused by the Inherent Controlled-Current Electrolytic Process of an Electrospray Ion Source," Int. J. Mass Spectrom. Ion Processes 1997, 162, 55-62.

(44) Van Berkel, G. J., "The Electrolytic Nature of Electrospray." In Electrospray Ionization Mass Spectrometry: Fundamentals, Instrumentation and Applications, edited by Cole, R., John Wiley, 1997.

(43) Chillier, X. Fr. D.; Monnier, A., Bill, H.; Gülaçar, F. O.; Buchs, A.; McLuckey, S. A.; Van Berkel, G. J. "A Mass Spectrometry and Optical Spectroscopy Investigation of Gas-Phase Ion Formation In Electrospray," Rapid Commun. Mass Spectrom. 1996, 10, 299-304.

(42) McLuckey, S. A., Van Berkel, G. J., Glish, G. L., Schwartz, J. C. "Electrospray and the Quadrupole Ion Trap." In Practical Aspects of Ion Trap Mass Spectrometry, Volume II, Ion Trap Instrumentation; Ed. by March, R. E. and Todd, J. F. J.; CRC Press: Boca Raton, 1995, Chapter 3, pp. 89-141.

(41) Van Berkel, G. J., Zhou, F. "Observation of Gas-Phase Molecular Dications Formed from Neutral Organics in Solution via the Controlled-Current Electrolytic Process Inherent to Electrospray," J. Am. Soc. Mass Spectrom. 1996, 7, 157-162.

(40) Zhou, F., Van Berkel, G. J., Morton, S. J.; Duckworth, D. C.; Adeniyi, W. K.; Keller, J. M. "Development of On-Line Electrochemical Sample Pretreatment Methods for the Analysis of Thallium and Uranium by ICP-MS." In Applications of Inductively Coupled Plasma-Mass Spectrometry to Radionuclide Determinations, ASTM STP1291, Morrow, R. W.; Crains, J. S., Eds., American Society for Testing and Materials, West Conshohocken, 1995, pp. 82-98.

(39) Van Berkel, G. J.; Zhou, F. "Electrospray as a Controlled-Current Electrolytic Cell: Electrochemical Ionization of Neutral Analytes for Detection by Electrospray-Mass Spectrometry," Anal. Chem. 1995, 67, 3958-3964.

(38) Zhou, F.; Van Berkel, G. J. "Electrochemistry Combined On-Line with Electrospray Mass Spectrometry," Anal. Chem. 1995, 67, 3643-3649.

(37) Van Berkel, G. J.; Zhou, F. "Characterization of an Electrospray Ion Source as a Controlled-Current Electrolytic Cell," Anal. Chem. 1995, 67, 2916-2923.

(36) Chillier, X. F. D.; Van Berkel, G. J.; Gülaçar, F. O.; Buchs, A. "Characterization of Chlorins within a Natural Chlorin Mixture using Electrospray/Ion Trap Mass Spectrometry," Org. Mass Spectrom. 1994, 29, 672-678.

(35) Van Berkel, G. J.; Zhou, F. "Chemical Electron-Transfer Reactions in Electrospray-Mass Spectrometry: Effective Oxidation Potentials of Electron-Transfer Reagents in Methylene Chloride," Anal. Chem. 1994, 66, 3408-3415.

(34) Zhou, F.; Van Berkel, G. J.; Donovan B. T. "Electron Transfer Reactions of C60F48," J. Am. Chem. Soc. 1994, 116, 5485-5486.

(33) McLuckey, S. A.; Van Berkel, G. J.; Goeringer, D. E.; Glish, G. L. "Ion Trap Mass Spectrometry of Externally Generated Ions." Anal. Chem. 1994, 66, 689A-696A.

(32) McLuckey, S. A.; Van Berkel, G. J.; Goeringer, D. E.; Glish, G. L. "Ion Trap mass Spectrometry Using High Pressure Ionization," Anal. Chem. 1994, 66, 737A-743A.

(31) Van Berkel, G. J., Asano, K. G., McLuckey, S. A. "Observation of Gas-Phase Molecular Dications Formed from Neutral Organics in Solution via Chemical Electron-Transfer Reactions by using Electrospray Ionization-Mass Spectrometry," J. Am. Soc. Mass Spectrom.1994, 5, 689-692.

(30) Van Berkel, G. J., Asano, K. G. "Chemical Derivatization for Electrospray Ionization-Mass Spectrometry. 2. Aromatics, Heteroaromatics and other Highly-Conjugated Systems," Anal. Chem. 1994, 66, 2096-2102.

(29) Quirke, J. M. E., Adams, C. L., Van Berkel, G. J. "Chemical Derivatization for Electrospray Ionization-Mass Spectrometry. 1. Alkyl halides, Alcohols, Phenols, Thiols, and Amines," Anal. Chem. 1994, 66, 1302-1315.

(28) Van Berkel, G. J., Quinoñes, M. A., Quirke, J. M. E. "Geoporphyrin Analysis using Electrospray Ionization-Mass Spectrometry," Energy & Fuels 1993, 7, 411-419.

(27) Van Berkel, G. J., Goeringer, D. E. "Gas Chromatography-Tandem Mass Spectrometry Implemented on a Bench-Top Quadrupole Ion Trap-Based Instrument using Random Noise to Effect Collision-Induced Dissociation," Anal. Chim. Acta 1993, 227, 41-54.

(26) Van Berkel, G. J., McLuckey, S. A., Glish, G. L. "Electrochemical Origin of Radical Cations Observed in Electrospray Ionization Mass Spectra," Anal. Chem. 1992, 64, 1586-1593.

(25) Ramsey, R. S. Van Berkel, G. J., McLuckey, S. A., Glish, G. L. "Determination of Pyrimidine Cyclobutane Dimers by Electrospray Ionization/Ion Trap Mass Spectrometry," Biol. Mass Spectrom. 1992, 21, 347-352.

(24) Van Berkel, G. J., McLuckey, S. A., Glish, G. L. "Unimolecular and Collision-Induced Reactions of Doubly Charged Porphyrins," J. Am. Soc. Mass Spectrom. 1992, 3, 235-242.

(23) McLuckey, S. A., Van Berkel, G. J., Glish, G. L. "Tandem Mass Spectrometry of Small, Multiply Charged Oligonucleotides," J. Am. Soc. Mass Spectrom. 1992, 3, 60-70.

(22) Van Berkel, G. J., McLuckey, S. A., Glish, G. L., "Preforming Ions in Solution via Charge-Transfer Complexation for Analysis by Electrospray Ionization Mass Spectrometry," Anal. Chem. 1991, 63, 2064-2068.

(21) McLuckey, S. A., Glish, G. L., Van Berkel, G. J., "Charge Determination of Product Ions Formed from Collision-Induced Dissociation of Multiply Protonated Molecules via Ion/molecule Reactions," Anal. Chem. 1991, 63, 1971-1978.

(20) Van Berkel, G. J., McLuckey, S. A., Glish, G. L., "Electrospray Ionization of Porphyrins using a Quadrupole Ion Trap for Mass Analysis," Anal. Chem. 1991, 63, 1098-1109.

(19) McLuckey, S. A., Glish, G. L., Van Berkel, G. J., "Multiple Stages of Mass spectrometry in a Quadrupole Ion Trap Mass Spectrometer: Prerequisites," Int. J. Mass Spectrom. Ion Proc. 1991, 106, 213-235.

(18) McLuckey, S. A., Van Berkel, G. J., Glish, G. L., Huang, E. C., Henion, J. D., "Ion Spray Liquid Chromatography/Ion Trap Mass Spectrometry Determination of Biomolecules," Anal. Chem. 1991, 63, 375-383.

(17) Beato, B. D., Yost, R. A., Van Berkel, G. J., Filby, R. H., Quirke, J. M. E., "The Henryville Bed of the New Albany Shale-III: Tandem Mass Spectrometric Analyses of Geoporphyrins from the Kerogen and Bitumen," Organic Geochem. 1991, 17, 93-105.

(16) Van Berkel, G. J., Joubert-Castro, A., Filby, R. H., "Tabulation of Exact Masses and Comparison of Isotope Patterns Expected for Geoporphyrin Molecular Ions in Electron Ionization Mass Spectra," Applied Geochem. 1991, 6, 105-107.

(15) Van Berkel, G. J., Glish, G. L., McLuckey, S. A., "High-Pressure Ammonia Chemical Ionization Mass spectrometry and Mass Spectrometry/Mass Spectrometry for Porphyrin Structure Determination," Energy & Fuels 1990, 4, 720-729.

(14) McLuckey, S. A., Van Berkel, G. J., Glish, G. L., "Reactions of Dimethylamine with Multiply Charged Ions of Cytochrome c," J. Am. Chem. Soc. 1990, 112, 5668-5670.

(13) Van Berkel, G. J., Glish, G. L., McLuckey, S. A., "Electrospray Ionization Combined with Ion Trap Mass Spectrometry." Anal. Chem.1990, 62, 1284-1295.

(12) Van Berkel, G. J., Glish, G. L., McLuckey, S. A., Tuinman, A. A., "Porphyrin Pyrrole Sequencing: Low Energy Collision Induced Dissociation of (M+7H)+ Generated In Situ During Ammonia Chemical Ionization," Anal. Chem. 1990, 62, 786-793.

(11) Louris, J. N., Brodbelt-Lustig, J. S., Cooks, R. G., Glish, G. L., Van Berkel, G. J., McLuckey, S. A., "Ion Isolation and Sequential Stages of Mass Spectrometry in a Quadrupole Ion Trap Mass Spectrometer," Int. J. Mass Spectrom. Ion Proc. 1990, 96, 117-137.

(10) Van Berkel, G. J., Glish, G. L., McLuckey, S. A., Tuinman, A. A., "Mechanism of Porphyrin Reduction and Decomposition in a High-Pressure Chemical Ionization Plasma," J. Am. Chem. Soc. 1989, 111, 6027-6035.

(9) Van Berkel, G. J., Glish, G. L., McLuckey, S. A., "Geoporphyrin Structure Determination Using Chemical Ionization-Mass Spectrometry/Mass Spectrometry," Org. Geochem. 1989, 14, 203-212.

(8) Van Berkel, G. J., Quirke, J. M. E., Filby, R. H., "The Henryville Bed of the New Albany Shale-II: Comparison of the Nickel and Vanadyl Porphyrins in the Bitumen and Those Generated from the Kerogen During Simulated Catagenesis," Org. Geochem. 1989, 14, 129-144.

(7) Van Berkel, G. J., Quirke, J. M. E., Filby, R. H., "The Henryville Bed of the New Albany Shale-I: Preliminary Characterization of the Nickel and Vanadyl Porphyrins in the Bitumen," Org. Geochem. 1989,14, 119-128.

(6) Joubert-Castro, A., Van Berkel, G. J., Doolittle, F. G., Filby, R. H., "Comparison of Electron Ionization and Fast Atom Bombardment-Mass Spectrometry for the Determination of Nickel, Vanadyl, and Free-Base Porphyrins," Org. Geochem. 1989, 14, 193-202.

(5) McLuckey, S. A., Glish, G. L., Asano, K. G., Van Berkel, G. J., "Self-Chemical Ionization in an Ion Trap Mass Spectrometer," Anal. Chem. 1988, 60, 2312-2314.

(4) Van Berkel, G. J., Filby, R. H., "Determination of the Mineral-Free Nickel and Vanadium Contents of Green River Oil Shale Kerogen." In Geochemical Biomarkers, edited by T. F. Yen and J. M. Moldowan, 1988, pp. 88-114.

(3) Van Berkel, G. J., Filby, R. H., "Generation of Nickel and Vanadyl Porphyrins from Kerogen During Simulated Catagenesis." In Metal Complexes in Fossil Fuels, edited by R. H. Filby and J. F. Branthaver, ACS Symposium Series 344, American Chemical Society, Washington, D.C., 1987, pp. 110-134.

(2) Filby, R. F., Van Berkel, G. J., "Geochemistry of Metal Complexes in Petroleum, Source Rocks, and Coals: An Overview." In Metal Complexes in Fossil Fuels, edited by R. H. Filby and J. F. Branthaver, ACS Symposium Series, 344, American Chemical Society, Washington, D.C., 1987, pp. 2-39.

(1) Filby, R. H., Van Berkel, G. J., Bragg, A. E., Joubert-Castro, A., Robinson, W. E., and Grimm, C. A., "Evaluation of Residual Fuel Oil Standard Reference Materials as Trace Element Standards," Journal of Radioanalytical and Nuclear Chemistry 1985, 91(2), 361-368.