Publications

  1. Boateng, A.; Irague, F.; Brajter-Toth, A.
    Low nM Detection Limits at Porous 13nm Thick Membrane-Coated Nanostructured Microdisk Electrodes
    Electroanal, 2013, 25 (2) 345-355 
  2. Boateng, A.; Brajter-Toth, A.
    Nanomolar detection of p-nitrophenol via in situ generation of p-aminophenol at nanostructured microelectrodes
    Analyst, 2012, 137 (19) 4531-4538
  3. Boateng, A.; Cohent-Shohet, R.; Brajter-Toth, A.
    Permeable porous 1-3 nm thick overoxidized polypyrrole films on nanostructured carbon fiber microdisk electrodes
    Electrochimica Acta., 2011, 56 (22) 7651-7658
  4. Steill, J.D.; Szczepanski, J.; Oomens, J.; Eyler, J.R.;Brajter-Toth, A.
    Structural characterization by infrared multiple photon dissociation spectroscopy of protonated gas-phase ions obtained by electrospray ionization of cysteine and dopamine
    Anal. Bioanal. Chem., 2011, 399 (7)2463-2473
  5. Looi, D.W.; Eyler, J.R.; Brajter-Toth, A.
    Electrochemistry-electrospray ionization FT ICR massspectrometry (EC ESI MS) of guanine-tyrosine and guanine-glutathione crosslinks formed on-line
    Electrochim. Acta, 2011, 56 (6) 2633-2640 
  6. Boateng, A.; Cohen-Shohet, R.; Brajter-Toth, A.
    Electrode Kinetics and Sensitivity of Nanostructured Electrodes from Different Carbon Fiber Precursor Materials
    Electroanal., 2011, 22(24)  2915-2923
  7. Kathiwala, M.; Affum, A.O.;Brajter-Toth,
    HPLC-UVmeasurements of metabolites in the supernatant of endothelial cellsexposed to oxidative stress
    Anal. Bioanal. Chem., 2010, 396 (5) 1763-1771
  8. Kathiwala,M.; Abou El-Nour, K. M.; Cohen-Shohet, R.; Brajter-Toth, A.
    Rapid measurements of 2,8-dihydroxyadenine(2,8-DHA) with a nanostructured electrochemical sensor in 5-fold diluted supernatants of endothelial cells exposed to oxidative stress.
    Analyst, Feb 2010, 135 (2), 296-301
  9. Mautjana,N.A.; Looi, D.W.; Eyler, J.R.; Brajter-Toth, A.
    Sensitivity of positive ion mode electrospray ionization mass spectrometry (ESI MS) in the analysis of purine bases in ESI MS and on-line electrochemistry ESI MS (EC/ESI MS)
    Electrochim. Acta, 2009, 55 (1), 52-58
  10. Mautjana,N.A.; Estes, J.; Eyler, J.R.; Brajter-Toth, A.
    Antioxidant pathways and one-electronoxidation of dopamine and cysteine in electrospray and on-line electrochemistry electrospray ionization mass spectrometry
    Electroanal., 2008, 20(18),1959-1967
  11. O’Mullane,A.P.; Zhang, J.; Brajter-Toth, A.; Bond A.M.
    Higher harmonic large-amplitude Fourier transformed alternating current voltammetry: Analytical attributes derived from studies of the oxidation of ferrocenemethanol and uric acid at a glassy
    Anal. Chem., 2008, 80(12) 4614-4626
  12. Kathiwala,M.; Affum, A.O.; Perry, J.;  Brajter-Toth A.
    Direct measurements of xanthine in 2000-fold diluted xanthinuric urine with a nanoporous carbon fibersensor
    Analyst, 2008, 133 (6) 810-816
  13. El-Nour,Kholoud Abou; Brajter-Toth, A.
    Development of adenosine sensor: effect of physiological buffers on activity and sensitivity in adenosine determinations by fast scan voltammetry.
    Analyst, Aug 2003, 128 (8), 1056-61
  14. Brajter-Toth, A.; Bravo, R.; Liang, P.;Cook J.
    Development and characterization of nanostructured electrodes for bioanalytical applications
    Conference Information: 223rd National Meeting of the American Chemical Society, April 07-11, 2002 Orlando, FL, USA
    Abstracts of Papers American Chemical Society, 2002,  223 (1-2) ANYL 182 
  15. Bravo,Roberto; Stickle, Dawn M.; Brajter-Toth, Anna
    Determination of uric acid in urine by fast-scan voltammetry (FSV) using a highly activated carbon fiberelectrode.
    Oxidative stress biomarkers andantioxidant protocols, 2002, 195-208
  16. Brajter-Toth A.; Bravo R.; Liang P.; Cook J.
    Development and characterization of nanostructured electrodes for bioanalytical applications.
    Abstr. Papers Am. Chem. Soc., Apr 7 2002 (223), Part 1, Meeting Abstract:182-ANYL, U92-U92
  17. Zhang TY; Palii SP; Eyler JR; Brajter-Toth A.
    Enhancement of ionization efficiency by electrochemical reaction products in on-line electrochemistry/electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry
    Anal. Chem., Mar 2002, 74 (5), 1097-1103
  18. Zhang TY; Brajter-Toth A.
    High sensitivity in particle beam mass spectrometry with a non-volatile electrolyte
    Anal. Chim. Acta, Aug 2001, 442 (1), 97-103
  19. Zhang TY; Brajter-Toth A.
    On-line investigation of the generation of nonaqueous intermediate radical cations by electrochemistry/mass spectrometry
    Anal. Chem., Jun 2000, 72 (11), 2533-2540
  20. Bravo, R.; Stickle, D.; Brajter-Toth, A.
    Determinationof Uric Acid in Urine by Fast Scan Voltammetry (FSV) Using a Highly Activated Carbon Fiber Electrode
    Oxidative Stress Biomarkers and Antioxidant Protocols, 2002, 195-208
  21. Brajter-Toth, A.; Abou El-Nour, K.; Cavalheiro, E.; Bravo, R.
    Nanostructured Carbon Fiber Disk Electrodes for Sensitive Determinations of Adenosine and Uric Acid
    Anal. Chem., Apr 2000, 72 (7), 1576-1584
  22. Jaramillo, A.; Spurlock, L.D., Young, V.; Brajter-Toth, A.
    XPS Characterization of Nanosized Overoxidized Polypyrrole Films on Graphite Electrodes
    Analyst, Aug 1999, 124 (8), 1215-1221
  23. Bravo, R.; Brajter-Toth, A.
    A highly active carbon fiber microdisk surface for the determination of uric acid in physiological buffers
    Anal. Chem. (Warsaw), Apr 1999, 44, 423-436
  24. Regino, M.; Brajter-Toth, A.
    Real time characterization of catalysis by on-line electrochemistry mass spectrometry. Investigation of quinone electrocatalysis of amine oxidation
    Electroanal., May 1999, (11) 5, 374-379
  25. Cavalheiro, E.; Brajter-Toth, A.
    Amperometric determination of xanthine and hypoxanthine at carbon electrodes. Effect of surface activity and the instrumental parameters on the sensitivity and the limit of detection.
    J. Pharmaceut. Biomed., Feb 1999, (19) 1-2, 217-230
  26. Bravo, R.; Hsueh, C.; Jaramillo, A.; Brajter-Toth, A.
    Possibilities and limitations in miniaturized sensor design for uric acid
    Analyst, Jul 1998, (123) 7, 1625-1630
  27. Regino, M.; Weston, C.; Brajter-Toth, A.
    Effect of mobile phase composition on the electrochemical cell conversion efficiency in electrochemistry/mass spectrometry.
    Anal. Chim. Acta., Aug 1998, (369) 3, 253-262
  28. Regino, M.; Brajter-Toth, A.
    An electrochemical cell for on-line electrochemistry mass spectrometry
    Anal. Chem., Dec 1997, (69) 24, 5067-5072
  29. Hsueh, C.; Bravo, R.; Jaramillo, A.; Brajter-Toth, A.
    Surface and kinetic enhancement of selectivity and sensitivity in analysis with fast scan voltammetry at scan rates above 1000 V/s
    Anal. Chim. Acta., Aug 1997, (349) 1-3, 67-76
  30. Spurlock, L.; Jaramillo, A.; Praserthdam, A.; Brajter-Toth, A.
    Selectivity and sensitivity of ultrathin purine-templated overoxidized polypyrrole film electrodes
    Anal. Chim. Acta., Dec 1996, (336) 1-3, 37-46
  31. Cheng, Q.; Brajter-Toth, A.
    Permselectivity sensitivity, and amperometric pH sensing at thioctic acid monolayer microelectrodes
    Anal. Chem., Dec 1996, (68) 23, 4180-4185
  32. Mackay, R.; Myers, S.; Brajter-Toth, A.
    Interpreting diffusion coefficients of electrochemical probes in oil-in-water microemulsions
    Electroanal., Aug-Sep 1996, (8) 8-9, 759-764
  33. Hsueh, C.; Brajter-Toth, A.
    A simple current transducer for ultramicro electrode measurements at a wide range of timescales
    Anal. Chim. Acta., Mar 1996, (321) 2-3, 209-214
  34. Cheng, C.; Brajter-Toth, A.
    Permselectivity and high-sensitivity at ultrathin monolayers- effect of film hydrophobicity
    Anal. Chem., Sep 1995, (67) 17, 2767-2775
  35. Marino, A.; Brajter-Toth, A.
    Modification of graphite surfaces with deoxycholic acid for electrochemical detection of cytochromec.
    Chem. Anal. (Warsaw), 1995, (40) 4, 565-578
  36. Hsueh, C.; Brajter-Toth, A.
    Electrochemical preparation and analytical applications of ultrathin overoxidized polypyrrolefilms.
    Anal. Chem., Aug 1994, (66) 15, 2458-2464
  37. Jaramillo, A.; Marino, A.; Brajter-Toth, A.
    Surfactant-modified graphite surfaces in biological analysis: ionic strength and ion charge effects.
    Anal. Chem., Dec 1993, (65) 23, 3441-3446
  38. Myers, S.; Mackay, R.; Brajter-Toth, A.
    Solution micro-structure and electrochemical reactivity. Effect of probe partitioning on electrochemical formal potentials in micro-heterogeneous solutions.
    Anal. Chem., Dec 1993, (65) 23, 3447-3453
  39. Hsueh, C.; Brajter-Toth, A.
    Fast-scan voltammetry in aqueous solutions at carbon fibre ultramicro-electrodes with online iR compensation.
    Anal. Chem., Jun 1993, (65) 11, 1570-1575
  40. Marino, A.; Brajter-Toth, A.
    Ionic surfactants as molecular spacers at graphite electrodes.
    Anal. Chem., Feb 1993, (65) 4, 370-374
  41. Quan, C.; Brajter-Toth, A.
    Selectivity and sensitivity of self-assembled thioctic acid electrodes.
    Anal. Chem., Sep 1992, (64) 17, 1998-2000
  42. Ahmad, K.; Brajter-Toth, A.
    Effect of ultramicro electrode array surface structure on analytical figures of merit of structurally different compounds.
    Anal. Chim. Acta., Apr 1992, (259) 1, 139-144
  43. Witkowski, A.; Brajter-Toth, A.
    Overoxidized polypyrrole films: a model for the design of permselective electrodes.
    Anal. Chem., Mar 1992, (64) 6, 635-641
  44. Volk, K.; Yost, R.; Brajter-Toth, A.
    Electrochemistry online with mass spectrometry. Insight into biological redox reactions.
    Anal. Chem., Jan 1992, (64) 1, A21
  45. Dabekzlotorzynska, E.; Ahmad, K.; Brajter-Toth, A.
    Effect of ultra-micro-electrode array structure and analyte properties on the detector response inflow-injection analysis.
    Anal. Chim. Acta., Jun 1991, (246) 2, 315-324
  46. Witkowski, A.; Freund, M.; Brajter-Toth, A.
    Effect of electrode substrate on the morphology and selectivity of over-oxidized polypyrrole films.
    Anal. Chem., Mar 1991, (63) 6, 622-626
  47. Freund, M.; Bodalbhail, L.; Brajter-Toth, A.
    Anion-excluding polypyrrole films.
    Talanta, Jan 1991, (38) 1, 95-99
  48. Zhu, S.; Brajter-Toth, A.
    Liquid-chromatographic determination of 6-thiopurine [mercaptopurine] metabolites formed invitro in electrochemical and enzymic oxidative activation.
    Anal. Chim. Acta., Oct 1990, (237) 2, 305-310
  49. McKenna, K.; Boyette, S.; Brajter-Toth, A.
    Electrochemical behaviour of small biological molecules at organic donor – acceptor electrodes in aqueous media.
    Anal. Chim. Acta., Mar 1988, (206) 1-2, 75-84
  50. McKenna, K.; Brajter-Toth, A.
    Tetrathiafulvalene tetracyanoquinodimethane- xanthine oxidase amperometric electrode for the determination of biological purines.
    Anal. Chem., Apr 1987, (59) 7, 954-958
  51. Gehron, M.; Brajter-Toth, A.
    Voltammetric behaviour of iron(II) at electrodes modified with quaternized poly-(4-vinylpyridine)cross-linked with bathophenanthrolinedisulphonic acid[4,7-diphenyl-1,10-phenanthrolinedisulphonic acid].
    Anal. Chem., Jun 1986, (58) 7, 1488-1492
  52. Szurley, E.; Brajter-Toth, A.
    In situ electrode modification for direct differential pulse polarography of 2,6-diaminopurine and its metabolite, 2,6-diaminopurin-8-ol.
    Anal. Chim. Acta., Nov 1983, (154), 323-327