2024-03-28T15:34:44Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/307762022-07-06T21:15:19Zcom_10324_1186com_10324_931com_10324_894col_10324_1404
00925njm 22002777a 4500
dc
Rodríguez Méndez, María Luz
author
Apetrei, Constantin
author
Alessio, Priscila
author
Constantino, Carlos José Leopoldo
author
Saja Sáez, José Antonio de
author
Pavinato, Felippe J.
author
Giuliani, E.
author
Zucolotto, V.
author
Oliveira, Osvaldo N.
author
2011
This paper describes the preparation of a biomimetic Langmuir-Blodgett film of tyrosinase incorporated in a lipidic layer and the use of lutetium bisphthalocyanine as an electron mediator for the voltammetric detection of phenol derivatives, which include one monophenol (vanillic acid), two diphenols (catechol and caffeic acid) and two triphenols (gallic acid and pyrogallol). The first redox process of the voltammetric responses is associated with the reduction of the enzymatically formed o-quinone and is favoured by the lutetium bisphthalocyanine because significant signal amplification is observed, while the second is associated with the electrochemical oxidation of the antioxidant and occurs at lower potentials in the presence of an electron mediator. The biosensor shows low detection limit (1.98×10(-6)-27.49×10(-6) M), good reproducibility, and high affinity to antioxidants (K(M) in the range of 62.31-144.87 μM). The excellent functionality of the enzyme obtained using a biomimetic immobilisation method, the selectivity afforded by enzyme catalysis, the signal enhancement caused by the lutetium bisphthalocyanine mediator and the increased selectivity of the curves due to the occurrence of two redox processes make these sensors exceptionally suitable for the detection of phenolic compounds.
Biosensors and Bioelectronics vol. 26 p. 2513-2519
0956-5663
http://uvadoc.uva.es/handle/10324/30776
10.1016/j.bios.2010.10.047
Biomimetic biosensor based on lipidic layers containing tyrosinase and lutetium bisphthalocyanine for the detection of antioxidants