CARBON PASTE ELECTRODE MODIFIED WITH CUO NANOPARTICLE AND MOLECULARLY IMPRINTED POLY(PYRROLE) FOR DETERMINATION OF ASCORBIC ACID BY VOLTAMMETRY

• Main Author: Savitri, Fauzia
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/87495
• Institution: Institut Teknologi Bandung

Ascorbic acid (AA) or vitamin C is an essential nutrient with antioxidant properties obtained from vegetables, fruits, or commercial products as the human body is unable to synthesize it. AA contributes to enhancing immunity and reducing oxidative stress, however, excessive consumption may inhibit the function of vitamin B12, while AA deficiency may cause disorders such as incomplete bone growth and mouth ulcers. Therefore, an analytical method is needed for the determination of AA. This study used the voltammetric method for the analysis of AA levels, with the working electrode being a carbon paste electrode (EPK) modified with CuO nanoparticles and molecularly imprinted polypyrrole. CuO is a semiconductor material that has high conductivity, while polypyrrole is a conductive polymer that is easily oxidized, easy to prepare and can interact with AA. The optimum modification was achieved at 8% (w/w) CuO composition and AA:pyrrole composition ratio in the electropolymerization process of 1:1 mM with 10 cycles at pH 4. The linear range of measurement was at a concentration of 100-1000 ?M with a correlation coefficient (R2) value of 0,9959 and a detection limit of 43,358 ?M. The measurement repeatability test on one EPK and EPK regeneration showed %RSD of 5,14% and 3,34%. Scan rate analysis showed that the transfer process on the electrode surface was controlled by a diffusion process. Sample analysis by voltammetry and UV-Vis spectrophotometry showed that the transfer process on the electrode surface is controlled by a diffusion process. Sample analysis using voltammetry and UV-Vis spectrophotometry showed consistent results with no significant differences