Electrochemical Oxidation of Tryptophan and Its Analysis in Pharmaceutical Formulations at a Poly(Methyl Red) Film-Modified Electrode

REFERENCES

• Carlsson , A. , and M. N. S. Lindqvist . 1978 . Dependence of 5-HT and catecholamine synthesis on concentrations of precursor amino-acids in rat brain . Naunyn Schmiedebergs Arch. Pharmacol. 303 : 157 – 64 .
   PubMed Web of Science ®Google Scholar
• Chen , G. N. , Z. F. Zhao , X. L. Wang , J. P. Duan , and H. Q. Chen . 2002 . Electrochemical behavior of tryptophan and its derivatives at a glassy carbon electrode modified with hemin . Anal. Chim. Acta 452 : 245 – 54 .
   Web of Science ®Google Scholar
• Femstrom , H. F. , and J. D. Femstrom . 1995 . Acute tyrosine depletion reduces tyrosine hydroxylation in rat central nervous system . Life Sci. 57 : 97 – 102 .
   Google Scholar
• Fiorucci , A. R. , and E. T. G. Cavalheiro . 2002 . The use of carbon paste electrode in the direct voltammetric determination of tryptophan in pharmaceutical formulations . J. Pharm. Biomed. Anal. 28 : 909 – 15 .
   PubMed Web of Science ®Google Scholar
• Fitznar , H. P. , J. M. Lobbes , and G. Kattner . 1999. Determination of enantiomeric amino acids with high-performance liquid chromatography and pre-column derivatisation with o-phthaldialdehyde and N-isobutyrylcysteine in seawater and fossil samples (mollusks). J. Chromatogr. A 832: 123–32.
   Web of Science ®Google Scholar
• Galal , A. J. 1998 . Electrocatalytic oxidation of some biologically important compounds at conducting polymer electrodes modified by metal complexes . Solid State Electrochem. 2 : 7 – 15 .
   Web of Science ®Google Scholar
• Hanaoka , S. , J. Lin , and M. Yamad . 2000 . Chemiluminescence behavior of the decomposition of hydrogen peroxide catalyzed by copper(II)–amino acid complexes and its application to the determination of tryptophan and phenylalanine . Anal. Chim. Acta 409 : 65 – 73 .
   Web of Science ®Google Scholar
• Inzelt , G. , M. Pineri , J. W. Schultze , and M. A. Voroyntsev . 2000 . Electron and proton conducting polymers: Recent developments and prospects . Electrochim. Acta 45 : 2403 – 21 .
   Web of Science ®Google Scholar
• Jin , G. P. , and X. Q. Lin . 2004 . The electrochemical behavior and amperometric determination of tyrosine and tryptophan at a glassy carbon electrode modified with butyrylcholine . Electrochem. Commun. 6 : 454 – 60 .
   Web of Science ®Google Scholar
• Kochen , W. , and H. Steinhart . 1994 . l-Tryptophan-Current Prospects in Medicine and Drug Safety . Berlin : de-Gruyter .
   Google Scholar
• Kunkel , A. , S. Gunter , and H. Watzig . 1997 . Determination of pharmaceuticals in plasma by capillary electrophoresis without sample pretreatment reproducibility, limit of quantitation and limit of detection . Electrophoresis 18 : 1882 – 89 .
   PubMed Web of Science ®Google Scholar
• Kunkel , A. , and H. Watzig . 1999 . Pharmacokinetic investigations with direct injection of plasma samples: Possible savings using capillary electrophoresis (CE) . Archiv. der Pharmazie 332 : 175 – 78 .
   Web of Science ®Google Scholar
• Lundstroem , K. 1983 . A pyrolytic carbon film electrode for voltammetry: Part 2. Oxidative Differential Pulse Voltammetry of Selected Organic Molecules . Anal. Chim. Acta 146 : 109 – 15 .
   Web of Science ®Google Scholar
• Pulgarin , J. A. M. , and L. F. G. Bermejo . 1996 . Flow-injection stopped-flow spectrofluorimetric kinetic determination of paracetamol based on its oxidation reaction by hexacyanoferrate(III) . Anal. Chim. Acta 333 : 59 – 69 .
   Web of Science ®Google Scholar
• Saeed , S. , and F. Leila . 2007 . Carbon paste electrode incorporating multi-walled carbon nanotube/cobalt salophen for sensitive voltammetric determination of tryptophan . Sens. Actuators, B 123 : 942 – 49 .
   Web of Science ®Google Scholar
• Sandulescu , R. , S. Mirel , and R. Oprean . 2000 . The development of spectrophotometric and electroanalytical methods for ascorbic acid and acetaminophen and their applications in the analysis of effervescent dosage forms . J. Pharm. Biomed. Anal. 23 : 77 – 87 .
   PubMed Web of Science ®Google Scholar
• Saurina , J. , S. Hern-andez-Cassou , E. F-abregas , and S. Alegret . 2000 . Cyclic voltammetric simultaneous determination of oxidizable amino acids using multivariate calibration methods . Anal. Chim. Acta 405 : 153 – 60 .
   Web of Science ®Google Scholar
• Shervington , L. A. , and N. Sakhnini . 2000 . A quantitative and qualitative high performance liquid chromatographic determination of acetaminophen and five of its para-substituted derivatives . J. Pharm. Biomed. Anal. 24 : 43 – 49 .
   PubMed Web of Science ®Google Scholar
• Tucker , D. J. , A. M. Bond , Z. Qing , and D. E. Ricett . 1989 . A study of the electrochemistry of tryptophan, peptides containing tryptophan, and related compounds (indoles) at mercury electrodes . J. Electroanal. Chem. 261 : 127 – 46 .
   Web of Science ®Google Scholar
• Wang , G. S. , T. Z. Peng , B. Z. Shen , P. L. Zhu , and L. N. Qu . 1993 . Ch. J. Anal. Chem. 21 : 779 – 82 .
   Google Scholar
• Wu , F. H. , G. C. Zhao , X. W. Wei , and Z. S. Yang . 2004 . Electrocatalysis of tryptophan at multi-walled carbon nanotube modified electrode . Microchim. Acta 144 : 243 – 47 .
   Web of Science ®Google Scholar
• Wu , J. M. , Q. Z. Shi , G. S. Wang , and T. Z. Peng . 1994 . Potato-juice modified carbon paste electrode for the determination of tryptophan . Chin. J. Anal. Chem. 22 : 599 – 601 .
   Google Scholar
• Yu , W. T. , H. M. Zhang , G. S. Chen , C. Y. Tu , and P. K. Ouyang . 2004 . Novel method for spectrophotometric determination of L-tryptophan in the enzymatic resolution of DL-N-acetyl-tryptophan . Microchim. Acta 146 : 285 – 90 .
   Web of Science ®Google Scholar