The Utilization Of Materials Obtained By The Sol-gel Process In Biosensors Construction [a Utilização De Materiais Obtidos Pelo Processo De Sol-gel Na Construção De Biossensores]

The use of sol-gel materials to develop new biosensors has received great attention due to its characteristics and versatility of sol-gel process. An overview is presented of the state-of-the-art of electrochemical biosensors employing sol-gel materials. Low-temperature, porous sol-gel ceramics represent a new class for the immobilization of biomolecules. 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Analytical Performance Of New Mixed Oxide (sio2/tio2/zno)-based Sorbent For Development Of A Reliable Mechanized Enrichment System For Copper Determination In Water And Food Samples

In the present study, a new composite material (SiO2/TiO2/ZnO) for copper preconcentration in water and food samples was evaluated. The sorbent was characterized by scanning electronic microscopy (SEM), Fourier transform infrared spectrophotometry (FT-IR), textural data analyses, energy dispersive X-ray fluorescence (EDXRF) and X-ray diffractometry (XRD). The on-line preconcentration and visible spectrophotometric determination was based on loading 20.0 mL of sample at pH 7.0 through 50 mg of sorbent at a flow rate of 6.4 mL min-1. A fixed volume of 0.3 mL of 0.5 mol L-1 HNO3 elutes copper ions, in which react with 0.3% (m/m) diethyldithiocarbamate (DDTC) whose complex formed (Cu(DDTC)2) is monitored at 452 nm. The selectivity of sorbent has been examined by assessing the effect of interfering ions. The proposed method provided linearity ranging from 20.0 to 230.0 μg L-1 (r = 0.998), preconcentration factor of 35.9 and limit of detection of 5.6 μg L-1. Water and food samples were successfully analyzed by proposed method and the accuracy was checked by analysis of certified reference materials of protein and liver of fish.251120542062Kendüzler, E., Türker, A.R., (2003) Anal. Chim. Acta, 480, p. 259Kurukan, I., Çahin, C.A., Çatiroʇlu, N., Bektaç, S., (2011) Microchem. J., 99, p. 159Roberts, E.A., Schilsky, M.L., (2003) Hepatology, 37, p. 1475Escudero, L.A., Cerutti, S., Olsina, R.A., Salonia, J.A., Gasquez, J., (2010) J. Hazard. Mater., 183, p. 218Tokman, N., (2007) J. Hazard. Mater., 143, p. 87http://water.epa.gov/drink/contaminants/, accessed in August 2014http://ec.europa.eu/environment/water/water-drink, accessed in August 2014http://bvsms.saude.gov.br/bvs/saudelegis/gm/2011/anexo/anexo_prt2914_12_12_2011.pdf, accessed in August, 2014Ferreira, S.L.C., Bezerra, M.A., Santos, W.N.L., Neto, B.B., (2003) Talanta, 61, p. 295Wang, J., Hansen, E.H., (2000) Anal. Chim. Acta., 424, p. 223Hasan, C., Bekir, B., (2002) Turk. J. Chem., 26, p. 599Hoshi, S., Tanaka, Y., Inoue, S., Matsubara, M., (1989) Anal. Sci., 5, p. 471Lima, G.F., Souza, P.M.J., Segatelli, M.G., Luccas, P.O., Tarley, C.R.T., (2010) Environanotechnology, , Fan, M.Huang, C.Bland, A. E.Wang, Z.Slimane, R.Wright, I., eds.Elsevier: Amstersdam ch. 9Brasil, J.L., Martins, L.C., Ev, R.R., Dupont, J., Dias, S.L.P., Sales, J.A.A., Airoldi, C., Lima, E.C., (2005) Int. J. Environ. Anal. Chem., 85, p. 475De Moraes, S.V.M., Brasil, J.L., Milcharek, C.D., Martins, L.C., Laranjo, M.T., Gallas, M.R., Benvenutti, E.V., Lima, E.C., (2005) Spectrochim. Acta, Part A, 62, p. 398Ávila, T.C., Segatelli, M.G., Beijo, L.A., Tarley, C.R.T., (2010) Quim. Nova, 33, p. 301Boyaci, E., Çaʇir, A., Shahwan, T., Eroʇlu, A.E., (2011) Talanta, 85, p. 1517Da Silva, E.L., Martins, A.O., Valentini, A., Fávere, V.T., Carasek, E., (2004) Talanta, 64, p. 181Yu, H., Song, H., Chen, M., (2011) Talanta, 85, p. 625Tarley, C.R.T., Fernandes, F.F., Luccas, P.O., Segatelli, M.G., (2011) Anal. Lett., 44, p. 216Budziak, D., Da Silva, E.L., De Campos, S.D., Carasek, E., (2003) Microchim. Acta, 141, p. 169Liu, Y., Liang, P., Guo, L., (2005) Talanta, 68, p. 25Lima, G.F., Ohara, M.O., Clausen, D.N., Nascimento, D.R., Ribeiro, E.S., Segatelli, M.G., Bezerra, M.A., Tarley, C.R.T., (2012) Microchim. Acta, 178, p. 61Costa, L.M., Ribeiro, E.S., Segatelli, M.G., Nascimento, D.R., Oliveira, F.M., Tarley, C.R.T., (2011) Spectrochim. Acta, Part B, 66, p. 329Diniz, K.M., Gorla, F.A., Ribeiro, E.S., Do Nascimento, M.B.O., Corrêa, R.J., Tarley, C.R.T., Segatelli, M.G., (2014) Chem. Eng. J., 239, p. 233Lima, G.F., Ferreira, V.S., Godoy, N.V., Medeiros, R.F., Garrido, F.M.S., Ribeiro, E.S., Nakagaki, S., Tarley, C.R.T., (2013) Microchem. J., 109, p. 98Liu, R., Liang, P., (2008) J. Hazard. Mater., 152, p. 166Vu, D., Li, Z., Zhang, H., Wang, W., Wang, Z., Xu, X., Dong, B., Wang, C., (2012) J. Colloid Interface Sci., 367, p. 429Khan, S.B., Rahman, M.M., Marwani, H.M., Asiri, A.M., Alamry, K.A., (2013) Nanoscale Res. Lett., 8, p. 377Zhang, H., Qiao, Y., Zhang, X., Fang, S., (2010) J. Non-Cryst. Solids, 356, p. 879Lee, S.W., Condrate, R.A., Sr., (1988) J. Mater. Sci., 23, p. 2951Pearson, R.G., (1963) J. Am. Chem. Soc., 85, p. 3533Kabil, M.A., Ghazy, S.E., Lasheen, M.R., Shallaby, M.A., Amar, N.S., (1996) Fresenius' J. Anal. Chem., 354, p. 371Uddin, M.N., Salam, M.A., Hossain, M.A., (2013) Chemosphere, 90, p. 366IUPAC, (1978) Spectrochim. Acta, Part B, 33, p. 241Yamini, Y., Tamaddon, A., (1999) Talanta, 49, p. 119Castilho, E., Cortina, J., Beltrán, J., Prat, M., Granados, M., (2001) Analyst, 126, p. 1149Lee, T., Choi, H., (2002) Bull. Korean Chem. Soc., 23, p. 861Lemos, V.A., Vieira, D.R., Novaes, C.G., Rocha, M.E., Santos, M.S., Yamaki, R.T., (2006) Microchim. Acta, 153, p. 19