Publications

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Calado, L. M., C. M. Cordas, and J. P. Sousa. "Acemetacin and indomethacin detection using modified carbon microelectrodes." Analytical and Bioanalytical Electrochemistry. 5.6 (2013): 665-671. AbstractWebsite
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Carvalho, R. N. L., R. M. Almeida, JJG Moura, N. T. Lourenço, L. J. P. Fonseca, and C. M. Cordas. "Sandwich-Type Enzymatic Fuel Cell Based on a New Electro-Conductive Material - Ion Jelly." ChemistrySelect. 1.20 (2016): 6546-6552. AbstractWebsite
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Cordas, C. M., A. G. Duarte, JJG Moura, and I. Moura. "Electrochemical behaviour of bacterial nitric oxide reductase - Evidence of low redox potential non-heme FeB gives new perspectives on the catalytic mechanism." Biochimica et Biophysica Acta - Bioenergetics. 1827.3 (2013): 233-238. AbstractWebsite
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Cordas, C. M., M. Campaniço, R. Baptista, L. B. Maia, I. Moura, and JJG Moura. "Direct electrochemical reduction of carbon dioxide by a molybdenum-containing formate dehydrogenase." Journal of Inorganic Biochemistry. 196 (2019). AbstractWebsite
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Cordas, C. M., J. Wilton, T. Cardoso, F. Folgosa, AS Pereira, and P. Tavares. "Electrochemical behaviour of Dps-a mini-ferritin." European Biophysics Journal with Biophysics Letters. 40 (2011): 181. AbstractWebsite
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Cordas, C. M., P. Raleiras, F. Auchere, I. Moura, and JJG Moura. "Comparative electrochemical study of superoxide reductases." European Biophysics Journal with Biophysics Letters. 41.2 (2012): 209-215. AbstractWebsite

Superoxide reductases are involved in relevant biological electron transfer reactions related to protection against oxidative stress caused by reactive oxygen species. The electrochemical features of metalloproteins belonging to the three different classes of enzymes were studied by potentio-dynamic techniques (cyclic and square wave voltammetry): desulfoferrodoxin from Desulfovibrio vulgaris Hildenborough, class I superoxide reductases and neelaredoxin from Desulfovibrio gigas and Treponema pallidum, namely class II and III superoxide reductases, respectively. In addition, a small protein, designated desulforedoxin from D. gigas, which has high homology with the N-terminal domain of class I superoxide reductases, was also investigated. A comparison of the redox potentials and redox behavior of all the proteins is presented, and the results show that SOR center II is thermodynamically more stable than similar centers in different proteins, which may be related to an intramolecular electron transfer function.

Cordas, C. M., N. M. T. Lourenco, P. Vidinha, CAM Afonso, S. Barreiros, L. P. Fonseca, and J. M. S. Cabral. "New conducting biomaterial based on Ion Jelly (R) technology for development of a new generation of biosensors." New Biotechnology. 25 (2009): S138-S139. AbstractWebsite
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Cordas, Cristina M., Americo G. Duarte, Jose J. G. Moura, and Isabel Moura. "Electrochemical behaviour of bacterial nitric oxide reductase-Evidence of low redox potential non-heme Fe-B gives new perspectives on the catalytic mechanism." Biochimica Et Biophysica Acta-Bioenergetics. 1827.3 (2013): 233-238. Abstract
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Cordas, C. M., A. Tenreiro, and L. M. Abrantes EQCM study on the polytyramine modified electrodes for the preparation of biosensors. Eds. Y. G. Gogotsi, and I. V. Uvarova. Vol. 102. Nanostructured Materials and Coatings for Biomedical and Sensor Applications, 102., 2003. AbstractWebsite
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Cordas, C. M., I. Moura, and JJG Moura. "Direct electrochemical study of the multiple redox centers of hydrogenase from Desulfovibrio gigas." Bioelectrochemistry. 74.1 (2008): 83-89. AbstractWebsite

Direct electrochemical response was first time observed for the redox centers of Desulfovibrio gigas [NiFe]-Hase, in non-turnover conditions, by cyclic voltammetry, in solution at glassy carbon electrode. The activation of the enzyme was achieved by reduction with H(2) and by electrochemical control and electrocatalytic activity was observed. The inactivation of the [NiFe]-Hase was also attained through potential control. All electrochemical data was obtained in the absence of enzyme inhibitors. The results are discussed in the context of the proposed mechanism currently accepted for activation/inactivation of [NiFe]-Hases. (C) 2008 Elsevier B.V. All rights reserved.

Cordas, C. M., and JJG Moura. "Molybdenum and tungsten enzymes redox properties – A brief overview." Coordination Chemistry Reviews. 394 (2019): 53-64. AbstractWebsite
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Cordas, C. M., A. S. Viana, S. Leupold, F. P. Montforts, and L. M. Abrantes. "Self-assembled monolayer of an iron(III) porphyrin disulphide derivative on gold." Electrochemistry Communications. 5.1 (2003): 36-41. AbstractWebsite

A novel iron(III) porphyrin disulphide derivative have been successfully immobilised on gold surfaces by self-assembly. The redox response of the modified electrodes was compared with the obtained for a similar iron porphyrin in solution, confirming the immobilisation of the metalloporphyrin. The gravimetric data obtained by electrochemical quartz crystal microbalance (EQCM) during adsorption allowed an estimation of the electrode coverage, providing further evidence for the formation of the porphyrin SAM. The modified electrodes were also measured by conventional and imaging ellipsometry. The electrocatalytic activity of the two modified electrodes was tested for the reduction of the molecular oxygen. (C) 2002 Elsevier Science B.V. All rights reserved.

Cordas, C. M., AS Pereira, C. E. Martins, C. G. Timoteo, I. Moura, JJG Moura, and P. Tavares. "Nitric oxide reductase: Direct electrochemistry and electrocatalytic activity." Chembiochem. 7.12 (2006): 1878-1881. AbstractWebsite
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Cordas, C. M., L. T. Guerra, C. Xavier, and JJG Moura. "Electroactive biofilms of sulphate reducing bacteria." Electrochimica Acta. 54.1 (2008): 29-34. AbstractWebsite

Biofilms formed from a pure strain of Desulfovibrio desulfuricans 27774 on stainless steel and graphite polarised surfaces were studied. The polarisation conditions applied were -0.4V vs. SCE for different times. A cathodic current related with the biofilms growth was observed with a maximum intensity of -270 mA m(-2) that remained stable for several days using graphite electrodes. These sulphate reducing bacteria biofilms present electrocatalytic activity towards hydrogen and oxygen reduction reactions. Electrode polarisation has a selective effect on the catalytic activity. The biofilms were also observed by scanning electronic microscopy revealing the formation of homogeneous films on the surfaces. (c) 2008 Elsevier Ltd. All rights reserved.