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Title

MEASUREMENT OF TYROSINE USING SOL-GEL/TIO2 ELECTRODE MODIFIED WITH OVER OXIDIZED POLYPYRROLE FILM

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Abstract

 AMINO ACIDS ARE ESSENTIAL BUILDING BLOCKS OF BIOLOGICAL MOLECULES, AND THE DEVELOPMENT OF NEW TECHNOLOGIES FOR THEIR SENSITIVE AND UNIVERSAL QUANTITATIVE DETERMINATIONS IS OF GREAT INTEREST 1. HOWEVER, THE DETERMINATION OF AMINO ACIDS IS NOT ALWAYS SIMPLE GIVEN THAT THESE COMPOUNDS LACK NATURAL CHROMOPHORE OR FLUOROPHORE FOR PHOTOMETRIC AND FLUOROMETRIC DETECTION. OVER THE PAST TWO DECADES, THE SIGNIFICANT ANALYSIS METHODS OF AMINO ACIDS HAVE FOCUSED ON UV-VISIBLE ABSORPTION, FLUORESCENCE, MASS SPECTROMETRY, AND THE LIKE, IN WHICH THE INVESTIGATED DERIVATIVES ARE FORMED MAINLY VIA THE REACTIONS BETWEEN THE PRIMARY AMINO GROUP AND O-PHTHALALDEHYDE IN THE PRESENCE OF AN ALKYL THIOL BY PRE- OR POSTCOLUMN DERIVATIZATION. BUT THE DERIVATIZATION PRODUCTS ARE USUALLY UNSTABLE, AND THE ABOVE DETECTION TECHNIQUES HAVE MORE OR LESS SUFFERED FROM DIVERSE DISADVANTAGES WITH REGARD TO THE EXPENSIVE EQUIPMENT, INSUFFICIENT SELECTIVITY, AND TIME-CONSUMING PROCESS OF SAMPLE PREPARATION. DURING THIS PERIOD, DUE TO ITS OBVIOUS ADVANTAGES OF FREE DERIVATIZATION, LOWER COST, BETTER SELECTIVITY, AND HIGHER SENSITIVITY, ELECTROCHEMICAL DETECTION HAS BEEN WIDELY EMPLOYED TO MONITOR A GREAT VARIETY OF ANALYTES OF INTEREST 2.SOL-GEL TECHNOLOGY AND USING OF SILICATED MATRIX THAT FINALLY WAS CRYSTALLIZED AS GLASSICAL CRYSTALS, HAS BEEN USED FOR ANALYTICAL INVESTIGATION SINCE LAST CENTURY. SOL-GEL ELECTROCHEMISTRY HAS PROVIDED EXTENSIVE RESEARCH RANGE IN ANALYTICAL CHEMISTRY IN LAST FIFTY YEARS. SOL-GEL PROCESS HAS BEEN DONE ON THE BASIS OF HYDROLYSIS AND CONDENSATION OF ORGANOMETALLIC ALKOXIDES FOLLOWING THE GEL FORMATION PROCESS BY FORMING POLYMERIC BONDS WITH M (OR) X. IN THIS RESEARCH, CARBON-CERAMIC ELECTRODE OF TYROSINE HAS BEEN USED FOR INVESTIGATION OF ELECTROCHEMICAL BEHAVIOR OF TYROSINE 3.EFFECTIVE PARAMETERS SUCH AS SOLUTION PH, SUPPORTING ELECTROLYTE CONCENTRATION, OPTIMIZING PERCENTAGE OF TIO2, MODIFYING WITH POLYPYROLE, SCAN RATE, WERE INVESTIGATED IN THIS RESEARCH. AMOUNT OF ADSORBED TYROSINE ON CARBON-CERAMIC ELECTRODE WAS DETERMINED USING CYCLIC VOLTAMMETRY.

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