Delphinidin immobilized on silver nanoparticles for the simultaneous determination of ascorbic acid, noradrenalin, uric acid, and tryptophan

 

Navid Nasirizadeh ^a,*, Zahra Shekari ^b, Mohammad Dehghani ^c, Somayeh Makarem ^d

^a Department of Textile and Polymer Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
^b Scientific Society of Nanotechnology, Yazd Branch, Islamic Azad University, Yazd, Iran
^c Young Researchers Club, Yazd Branch, Islamic Azad University, Yazd, Iran
^d Department of Chemistry, Karaj Branch, Islamic Azad University, Karaj, Iran

 

In the present study, the fabrication of a new modified electrode for electrocatalytic oxidation of noradrenalin, based on the delphinidin immobilized on silver nanoparticles modified glassy carbon electrode. Cyclic voltammetry was used to investigate the redox properties of this modified electrode. The surface charge transfer rate constant (k_s) and the charge transfer coefficient (α) for the electron transfer between the glassy carbon electrode and the immobilized delphinidin were calculated. The differential pulse voltammetry exhibited two linear dynamic ranges and a detection limit of 0.40μM for noradrenalin determination. Moreover, the present electrode could separate the oxidation peak potentials of ascorbic acid, noradrenalin, uric acid, and tryptophan in a mixture. The usefulness of this nanosensor was also investigated for the determination of ascorbic acid, noradrenalin, and uric acid in pharmaceutical and biological fluid samples with satisfactory results.

 

Keywords: delphinidin, noradrenalin, silver nanoparticle, voltammetric nanosensor