A glassy carbon electrode modified with boron-doped graphene oxide/ polyaspartic acid for electrochemical determination of oxazepam

محورهای موضوعی : Iranian Journal of Catalysis

Maryam Behravan ¹ , Hossein Aghaie ² , Masoud Giahi ³ , Laleh Maleknia ⁴

1 - Department of Chemistry, Sciences and Research Brench, Islamic Azad University, Tehran, Iran
2 - Department of Chemistry, Sciences and Research Brench, Islamic Azad University, Tehran, Iran
3 - Department of Chemistry, South Tehran Branch, Islamic Azad University, Tehran, Iran
4 - Department of Biomedical Enginiring, South Tehran Branch, Islamic Azad University, Tehran, Iran

تاریخ دریافت : 1401/02/22 تاریخ پذیرش : 1401/06/05 تاریخ انتشار : 1401/06/10

کلید واژه: Boron, Differential pulse voltammetry, Graphene oxide, aspartic acid, Glassy carbon electrode, Oxazepam,

چکیده مقاله :

In this study, the electrochemical determination of oxazepam in plasma samples was studied. The composite of graphene oxide/boron (B-RGO) was synthesized via the hydrothermal method and it was cast on the glassy carbon electrode (GCE). The polyaspartic acid (poly(ASP)) was deposited on the B-RGO by electropolymerization to prepare the modified electrode named B-RGO/ poly(ASP)|GCE. The B-RGO and B-RGO/poly ASP were characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Electrochemical studies were performed by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV) methods. The experimental parameters affecting the reduction of oxazepam such as pH, preconcentration time, scan rate and other analysis conditions, and instrumental parameters were optimized. Under the optimal conditions, the linear range was obtained from 0.001 to 800 μM with a correlation coefficient of 0.998. The repeatability of the method for the electrode to electrode and one electrode were 4.3% and 4.9%, respectively. The limit of detection (LOD) of 0.3 nM and the limit of quantitation (LOQ) of 1 nM were obtained. The high efficiency of the developed electrode in the determination of oxazepam in the plasma sample was proved by using acceptable results and satisfactory relative recovery percentage (>90%). Based on our calculation, the heterogeneous electron transfer rate constant (ks) was 1.92 s-1. The interaction between oxazepam and modifier was single-layer and multi-layer adsorption, respectively in low and high concentrations.

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