Cumba, Loanda Raquel [UNESP]Bicalho, Urquisa de Oliveira [UNESP]do Carmo, Devaney Ribeiro [UNESP]2014-05-202014-05-202012-05-01International Journal of Electrochemical Science. Belgrade: Electrochemical Science Group, v. 7, n. 5, p. 4465-4478, 2012.1452-3981http://hdl.handle.net/11449/10150In this work, a novel Titanium (IV) Phosphate (TiPh) composite was prepared using a easily methodology of the synthesis. A preliminary characterization of the precursor and resulting materials was defined using spectroscopic and voltammetric techniques. As a second step, TiPh was reacted with silver ions (TiPhAg) and subsequent hexacyanoferrate was added (TiPhAgHCF). The electrochemical behaviour of the composite (TiPhAgHCF) was verified by means of a graphite paste electrode using cyclic voltammetry in a potential range of 0.2 to 0.9 V (vs Ag/AgCl). The cyclic voltammogram of the modified electrode containing (TiPhAgHCF) exhibited a single redox couple. The redox couple present a formal potential (E-theta) of 0.77 V vs Ag/AgCl (KNO3 1.0 mol L-1; v = 20 mV s(-1)) and ascribed to the [Fe-II(CN)(6)] / [Fe-III(CN)(6)] processes. In a electroanalytical study, the peak located at 0.77 V present a sensitive response to L-cysteine. The modified graphite paste electrode showed a linear range from 2.0x10(-4) to 9.0x10(-3) mol L-1 for the determination of L-cysteine with a limit detection of 3.34x10(-4) mol L-1 and relative standard deviation of. 5% (n = 3) and amperometric sensitivity 10.34x10(-3) A mol L-1. The modified electrode was electrochemically stable and showed excellent reproducibility.4465-4478engTitanium (IV) phosphatecyclic voltammetryL-cysteineArtigoWOS:000305267000052Acesso abertoWOS000305267000052.pdf16147456978700030545046720519536