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Vasilescu, I., Eremia, S. A. V. *, Kusko, M., Radoi, A., Vasile, E., Radu, G. -L. . Molybdenum disulphide and graphene quantum dots as electrode modifiers for laccase biosensor. Biosensors and Bioelectronics, 75, pp. 232-237, 2016.

Abstract: A nanocomposite formed from molybdenum disulphide (MoS2) and graphene quantum dots (GQDs) was proposed as a novel and suitable support for enzyme immobilisation displaying interesting electrochemical properties. The conductivity of the carbon based screen-printed electrodes was highly improved after modification with MoS2 nanoflakes and GQDs, the nanocomposite also providing compatible matrix for laccase immobilisation. The influence of different modification steps on the final electroanalytical performances of the modified electrode were evaluated by UVvis absorption and fluorescence spectroscopy, scanning electron microscopy, transmission electron microscopy, X ray diffraction, electrochemical impedance spectroscopy and cyclic voltammetry. The developed laccase biosensor has responded efficiently to caffeic acid over a concentration range of 0.38100 M, had a detection limit of 0.32 M and a sensitivity of 17.92 nA M−1. The proposed analytical tool was successfully applied for the determination of total polyphenolic content from red wine samples.

Keywords: MoS2; Graphene quantum dots; Laccase; Biosensor; Polyphenol index

URL: http://www.sciencedirect.com/science/article/pii/S0956566315303778

Posted by Sandra Eremia

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