Background: Measuring tartaric acid in liquid food, such as fruits or fruit products is of
great importance for assessing the quality of the food.
Objective: The aim of the research is to obtain polyaniline/Cu bismuthate nanoflake composites by an
in-situ polymerization route for the electrochemical detection of tartaric acid.
Methods: Polyaniline/Cu bismuthate nanoflake composites were prepared by in-situ aniline polymerizing
route in aqueous solution. The obtained products were characterized by X-Ray diffraction
(XRD), Transmission Electron Microscopy (TEM) and high-resolution TEM (HRTEM), respectively.
The electrochemical performance for tartaric acid detection has been investigated by cyclic voltammetry
method using polyaniline/Cu bismuthate nanoflake composites modified glassy carbon electrode.
Results: The nanocomposites comprise of tetragonal CuBi2O4 phase. Polyaniline particles with the size
of less than 100 nm attach to the surface of the nanoflakes. A pair of quasi-reversible cyclic voltammetry
peaks are located at -0.01 V and +0.04 V, respectively at the 20wt.% polyaniline/Cu bismuthate
nanoflake composites modified glassy carbon electrode. The limit of detection is 0.58 µM with the linear
range of 0.001-2 mM. The linear range increases from 0.005-2 mM to 0.001-2 mM and limit of detection
decreases from 2.3 µM to 0.43 µM with increasing the polyaniline content from 10wt.% to 40wt.%.
Conclusion: Comparing with the Cu bismuthate nanoflakes modified glassy carbon electrode, polyaniline/
Cu bismuthate nanoflake composites modified glassy carbon electrode shows enhanced electrochemical
performance for tartaric acid detection.