Centri-Voltammetric Folic Acid Detection

Abstract

The need for practical detection of folic acid (FA) has been increased day by day. For this reason in this work, a two steps electroanalytical technique, centri-voltammetry was utilized for FA detection for the first time. In order to get rid of the slow electrode kinetics of FA oxidation, the working electrode was modified with graphene-Pt hibrid nanomaterial. Also for increasing the sensitivity, 1-Chloro-2-[2-(2-methoxyethoxy) ethoxy]ethane (TEG-Cl) and 1,2-di{2-[2-(2-methoxyethoxy)ethoxy] ethoxy}-4-nitrobenzene (4NC-NO2) was used as a carrier material. After the characterization of graphene-Pt hybrid nanomaterial, experimental parameters like, 4NC-NO2 amount, adsorption time, centri-voltammetric parameters like centrifuge time and speed were optimized. After that, analytical characteristics such as linear range, relative standard deviation (R.S.D), limit of detection (LOD) and limit of quantification (LOQ) values were found. In this manner, linear range was obtained for FA between 1.0 mu M-1000 mu M with the equations of y=0.0108x+1.0459 (R-2=0.9977). R.S.D value was calculated for 0.83 mM FA (n=3) as 1.86 % while LOD and LOQ values were found as 1.00 mu M and 3.34 mu M respectively. After the examination of interference effect of substances like ascorbic acid and uric acid, established centri-voltammetric technique was enforced for FA detection in pharmateutical tablets. As a result, the recovery value was calculated as 96.4 %.