SCREEN PRINTED CARBON ELECTRODE MODIFIED GNPS/ZNO NANOPARTICLE AND MOLECULARLY IMPRINTED POLY(CHITOSAN) FOR DETECTION OF METHYL PARABEN IN COSMETIC PRODUCTS

• Main Author: DWI OKTAVIANI, ATIK
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/70425
• Institution: Institut Teknologi Bandung

Screen printed carbon electrode modified by GNPs/ZnO Nanoparticle and molecularly imprinted poly(chitosan) (MIP) was intended for detection of methyl paraben in cosmetic products. The GNPs/ZnO nanoparticle used for increasing the rate of electron transfer to the electrode and MIP for improving selectivity of the analyte. MIP was synthesized by chitosan as monomer and methyl paraben as template with chronoamperometry technique at potential –1,2 V for 300 s. SPCEGNPs/ ZnO/MIP then characterized by SEM EDX, cyclic voltammetri then confirmed by differential pulse voltammetry. The experimental parameters were optimized to improve the sensor performance such as concentration of GNPs/ZnO nanoparticle, electrodeposition time of monomer, and effect of pH. Determination of methyl paraben was carried out in 0,01 M buffer phosphate and 0,1 M KCl by differential pulse voltammetry technique at potential range 0,1 V to 1,1 V and a scan rate 100 mV/s. Under optimized conditions, the anodic peak current and methyl paraben concentration have good linearity over the range from 10 ?M to 1000 ?M with the limit of detection (LOD) of 9,16 ?M. The modified electrode was applied to determine methyl paraben in cosmetic products and the results were compared with determination of methyl paraben by UV-VIS spectroscopy. The proposed sensor was successfully detection methyl paraben in cosmetic products with recovery percentage 96,45% - 97,47%. This sensor has promising be applied in other fields such as food sector, medical field, and environmental analysis because the sensor not only good in sensitivity and selectivity but also excellent repeatability and reproducibility.