Ultrasonication-assisted construction of neodymium oxide nanoparticles-carbon nanotubes based voltammetric platform for the sensitive determination of chlorogenic acid in tomato juice and fizzy drink

Abstract

Neodymium oxide (Nd2O3) nanoparticles were synthesized by dropwise addition of ammonia solution to an aqueous solution of Nd(NO3)3 followed by sonication in an ultrasonic bath and calcination of the product at 600 ⸰C for 4 h. Then, carbon nanotubes (CNTs) were decorated with nanoparticles of Nd2O3 under sonication for the preparation of a sensitive platform based on a glassy carbon electrode (GCE) for the detection of chlorogenic acid. The proposed platform (Nd2O3@CNTs/GCE) exhibited improved voltammetric behavior for chlorogenic acid as the peak response increased and the separation of anodic peak and cathodic peak potentials (ΔEp) decreased. The proposed method of analysis produced a dynamic working range of 5.0 × 10−8–6.1 × 10−5 M at Nd2O3@CNTs/GCE with a detection limit (LOD) of 6.2 × 10−9 M for chlorogenic acid. The Nd2O3@CNTs/GCE system possesses a much higher surface area with much more active sites in comparison to other electrodes. The proposed voltammetric platform also yielded a lower value of LOD as well as higher sensitivity for chlorogenic acid when compared to the literature values. The proposed voltammetric platform was successfully applied to the determination of chlorogenic acid in locally grown bunch cherry tomato juice and çamlıca brand fizzy drink. The value of chlorogenic acid was found to be 13.1 mg/L and 1.57 mg/L for samples of tomato juice and fizzy drink, respectively.