Fast, Simple and Sensitive Determination of Coumaric Acid in Fruit Juice Samples by Magnetite Nanoparticles-Zeolitic Imidazolate Framework Material

Abstract

In this work, magnetic iron nanoparticle (Fe3O4) was functionalized a zeolitic imidalozate framework (ZIF-4) material by co-precipitation process to provide a magnetic hybrid nanomaterial,viz. Fe3O4@ZIF-4. The structural characterization was performed different spectroscopic, thermal and microscopic techniques. Moreover, voltammetric sensor properties of Fe3O4@ZIF-4 nanohybrid material for determination ofp-coumaric acid (CA) were performed by differential pulse (DPV) and cyclic voltammetry (CV). A reliable and selective electroanalytical method exhibited for the detection of CA. It was found that the deposition of Fe3O4@ZIF-4 nanohybrid on a glassy carbon electrode (GCE) brought about 2.3, 3.5 and 5.0 fold more sensitive than Fe3O4/GCE, ZIF-4/GCE and unmodified GCE responses to CA in Britton-Robinson (B-R) buffer solution (a pH of 4). The detection, quantification limits and linear range of CA were determined as 0.18, 0.60 mu M and 0.50-12.00 mu M. The stability, repeatability and selectivity of the suggested Fe3O4@ZIF-4 modified GCE sensor was fully investigated. In addition, an application of orange juices samples was performed on modified electrode for determination of CA, which was showed by a standard addition method with verifying of High Performance Liquid Chromatography (HPLC) analysis. Besides the ease of synthesis and low price, the suggested Fe3O4@ZIF-4/GCE sensor offers repeatability, selectivity, stability and easy to apply to real samples.