Monoamine oxidase B layer-by-layer film fabrication and characterization toward dopamine detection
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2016
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Miyazaki, Celina Massumi
Pereira, Tamyris Paschoal
Tavares Mascagni, Daniela Branco
de Moraes, Marli Leite [UNIFESP]
Ferreira, Marystela
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In this work nanostructured film composites of the monoamine oxidase B (MAO-B) enzyme, free or encapsulated in liposomes, were fabricated by the layer-by-layer (LbL) self-assembly technique, employing polyethylene imine (PEI) as polycation. Initially, the MAO-B enzyme was incorporated into liposomes in order to preserve its enzymatic structure ensuring their activity and catalytic stability. The LbL film growth was monitored by surface plasmon resonance (SPR) by gold resonance angle shift analysis after each bilayer deposition. Subsequently, the films were applied as amperometric biosensors for dopamine detection using Prussian Blue (PB) as the electron mediator. The biosensor fabricated by MAO-B incorporated into liposomes composed of DPPG:POPG in the ratio (1:4) (w/w) showed the best performance with a sensitivity of 0.86 (mu A cm(-2))/(mmol L-1) and a detection limit of 033 mmol L-1. (C) 2015 Elsevier B.V. All rights reserved.
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Materials Science & Engineering C-Materials For Biological Applications. Amsterdam, v. 58, p. 310-315, 2016.