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Eduardo Neves, nosso eterno mestre
Gutz,Ivano G. R.Eduardo Fausto de Almeida Neves, Professor Emeritus of the Universidade Federal de São Carlos and formerly Full Professor at the Instituto de Química - Universidade de São Paulo (USP), São Paulo, Brazil, was born in November 7, 1933 in Pedra Azul, MG, and deceased in July 2, 2006 in São Carlos, SP. He graduated under supervision of Professor Paschoal Senise, pioneer of Analytical Chemistry at USP, and developed...
Effect of scavengers on the photocatalytic digestion of organic matter in water...
Cavicchioli,Andrea; Gutz,Ivano G. R.The influence of electron and hole scavengers in the photocatalytic digestion of organic matter in the presence of suspended particles of TiO2 was investigated. The process, aiming at the electrochemical determination of traces of heavy metals in water samples, was followed through the recovery of the voltammetric wave of Cd(II) in the presence of EDTA, chosen as model ligand that mimics the complexing effect o...
Propulsor pneumático versátil e isento de pulsação para sistemas de análise em ...
Matos,Renato C.; Gutz,Ivano G. R.; Angnes,Lúcio; Fontenele,Rinaldo S.; Pedrotti,Jairo J.Aquarium air pumps are proposed and evaluated as pneumatic liquid propulsion devices for flow injection and continuos flow analysis (FIA and CFA) systems. This kind of pump is widely available at a very low cost and it can sustain a pressure around of 4 psi (0.28 bar) indefinitely. By applying this air pressure onto a solution contained in a reservoir flask, it is possible to reach flow rates of up to 12.5 mL m...
Injetor multicanal com válvulas de estrangulamento para análise em fluxo
Palgrossi,Fabiano S.; Pedrotti,Jairo J.; Gutz,Ivano G. R.An important component for the automation of flow injection analysis (FIA) systems is the sample injection valve. A simple and inexpensive commutator with 16 pinch valves (8 normally open and 8 closed) was developed and configured as a multichannel injection valve. It is activated by a single solenoid of 3 Kgf, powered by a pulsed driver circuit, controlled by a microcomputer or a switch. FIA with spectrophomet...
Eletrodos modificados com DNA: uma nova alternativa em eletroanálise
La-Scalea,Mauro A.; Serrano,Silvia H. P.; Gutz,Ivano G. R.The first studies about DNA electrochemistry appeared at the end of the fifties. The voltammetric techniques became important tool for the DNA conformational analysis, producing evidences about DNA double helix polimorphism. The new techniques based on electrodes modification with nucleic acid enlarged the use of the electrochemical methods on the DNA research. DNA electrochemical biosensors are able to detect ...
Voltammetric Behaviour of Metronidazole at Mercury Electrodes
La-Scalea,Mauro A.; Serrano,Silvia H.P.; Gutz,Ivano G.R.Metronidazole is the most important drug of the group of 5-nitroimidazoles and possesses toxicity to anaerobic micro-organisms DNA being the main target for their biological action. The mechanism of biological action of metronidazole is dependent upon the nitro group reduction process. The reduction of metronidazole is pH dependent in acid medium and four electrons are involved in the complete reduction to the ...
Determination of the surface charge density of a mercury electrode by extrusion...
Brito, Maria S. L.; Angnes, Lúcio; Brett, Christopher M. A.; Gutz, Ivano G. R.The accurate determination of the surface charge density at the mercury ; solution interface by the method of extrusion of mercury drops is impaired by the faradaic current caused by traces of electroactive species. This paper describes a new design of a hanging mercury drop electrode with accurate control of the extruded electrode area, to within 0.1%, together with a new and reliable procedure for correcti...
Automatização de um destilador d'água
Neves,Carlos A.; Gutz,Ivano G. R.; Lago,Claudimir L. doA simple and inexpensive device to automate a water distilling apparatus is shown. It is composed by a magnetic floater placed in the water reservoir and a level control unit, which acts over the heating element circuit. In order to provide water saving, an electromagnetic valve is inserted in the water supply inlet. Some suggestions for the adaptation to other types of equipment are also offered.
Flow-injection determination of catechol with a new tyrosinase/DNA biosensor
Dantoni, Patrícia; Serrano, Sílvia H. P.; Brett, Ana Maria Oliveira; Gutz, Ivano G. R.Biosensors find application in flow analysis due to their high selectivity and sensitivity. Decrease in the response during extended use, originated by degradation, inhibition or structural changes of the enzyme or leaching of active components by the flow, is the prevailing problem. As an alternative to additives and preparation techniques cited in the literature, it is proposed to use DNA as a matrix for impr...
Comparison of the voltammetric behavior of metronidazole at a DNA-modified glas...
Brett, Ana Maria Oliveira; Serrano, Silvia H. P.; Gutz, Ivano G. R.; La-Scalea, Mauro A.The electroanalytical performance at three electrodes: DNA-modified galssy carbon electrode, mercury thin film electrode and glassy carbon electrode, for the study of the electrochemical reduction of metronidazole is compared. All three electrodes showed a similar trend in the reduction mechanism for metronidazole, depenent on pH in the acid and neutral region and independent in alkaline media, although there w...
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