Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6661790 | Journal of Electroanalytical Chemistry | 2018 | 8 Pages |
Abstract
The present study demonstrates the development of a voltammetric sensor based on graphite/restricted access molecularly imprinted poly(methacrylic acid)/SiO2 composite for folic acid determination in pharmaceutical formulation. The insertion of hybrid molecularly imprinted polymer with restricted access (RAM-MIP) into the graphite paste provided enhance in the cathodic peak current for FA. As the electric conductivity of RAM-MIP is very poor, the optimum content was found to be very low (3%, w/w) in the composite. Under optimized conditions (0.1â¯molâ¯Lâ1 Britton-Robinson buffer and pHâ¯4.5) using square wave voltammetry (frequency of 150â¯Hz, pulse amplitude of 90â¯mV and potential increment of 7â¯mV) a limit of detection of 0.72â¯Î¼gâ¯Lâ1 (1.63â¯nmolâ¯Lâ1) and a linear range from 5.0 to 100.0â¯Î¼gâ¯Lâ1 (0.01 to 0.23â¯Î¼molâ¯Lâ1) were obtained. The method precision was assessed in terms of inter-day (nâ¯=â¯6) and intra-day precision (two consecutive days), whose relative standard deviations (RSD%) ranged from 3.56 to 5.01%. The developed method was applied for FA determination in pharmaceutical samples whose accuracy was attested by means of addition and recovery assays (97.7-105.0%) as well as by high performance liquid chromatography (HPLC) as a reference technique, thus indicating that RAM-MIP sensor might be successfully applied for quality control in the real samples.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Michele Kuceki, Fernanda Midori de Oliveira, Mariana Gava Segatelli, Malena Karla Lombello Coelho, Arnaldo César Pereira, Luana Rianne da Rocha, Jhessica de Cássia Mendonça, César Ricardo Teixeira Tarley,