[Zurück]

T. Rahmani, A. Hajian, A. Afkhami, H. Bagheri:
"A novel and high performance enzyme-less sensing layer for electrochemical detection of methyl parathion based on BSA templated Au-Ag bimetallic nanoclusters";
New Journal of Chemistry, 42 (2018), S. 7213 - 7222.

In the present manuscript, a modified glassy carbon electrode with BSA templated Au-Ag bimetallic
nanoclusters (Au-Ag@BSA/GCE) was employed for the rapid, selective and sensitive determination of
methyl parathion (MP) as an enzyme-less electrochemical biosensor. The properties and morphology of
the synthesized bimetallic nanoclusters were characterized by fluorescence, transmission electronic
microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy techniques.
Additionally, the properties of the prepared biosensors were investigated by cyclic voltammetry (CV),
square wave anodic stripping voltammetry (SWASV) and electrochemical impedance spectroscopy (EIS).
The results show that Au-Ag@BSA/GCE greatly catalyzed the redox reaction of MP during electrochemical
detection. Under optimal conditions, the linear dynamic ranges of MP were obtained between 0.02 to
8.0 and 8.0 to 200 mmol L
1
, with a detection limit of 8.2 nmol L
1
. The selectivity, stability, repeatability,
and reproducibility of Au-Ag@BSA/GCE were studied, and the obtained data suggest that the proposed
biosensor has an excellent capacity as an alternative to enzyme inhibition-based biosensors for the
determination of MP. The constructed biosensor was able to successfully electrochemically determine the
presence of MP in different water, apple, vegetable, and soil samples.

http://dx.doi.org/10.1039/c8nj00425k