Development of electrode carbon paste/molecularly imprinted polymer (MIP) with methacrylic acid as monomer to analyze glucose by potentiometry

Electrodes with carbon paste and molecularly imprinted polymer (MIP) have been developed to analyze glucose by potentiometry. The MIP was made by mixing glucose as template, methacrylic acid as monomer and ethylene glycol dimethacrylate as cross-linker with a mole ratio of 1:4:12. The electrode made by mixing activated carbon, MIP and paraffin with a ratio of 50:35:15 (% by weight) was observed to perform optimally. The results obtained show that analysis of glucose gives optimum results at a pH of 5 (without pH adjustment). The analysis of glucose using the carbon paste/MIP electrode gives a Nernst factor of 28.80 mV/decade; the measurement range is 10⁻²–10⁻⁵ M, and the limit of detection is 5.87.10⁻⁵ M. In this study, it can be shown that urea did not interfere in the analysis of glucose using this method. The accuracy of this electrode is 70.7–129%, and the coefficient of variation is 0.06–0.18% for the concentration range 10⁻⁵–10⁻² M. This electrode showed a response time of less than 2 minutes and could be used 145 times.