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Formaldehyde electrochemical sensor using Chitosan-Glutaraldehyde/ZnO-Nanoparticles Electrode 1Analytical Chemistry Research Group, Faculty of Sciences and Informatics Abstract It is necessary to develop sensitive, selective, and accurate analytical sensor technology for the determination of formaldehyde because formaldehyde is very dangerous to health. The use of formaldehyde as food preservatives has long been prohibited by the government, but there are still some sellers using formaldehyde. In this research, we studied the use of glassy carbon electrodes and copper electrodes coated with chitosan-ZnO nanoparticles crosslinked with glutaraldehyde for the application of formaldehyde biosensors in food. Chitosan is a biodegradable natural polymer and the addition of ZnO nanoparticles to the chitosan-glutaraldehyde modification is expected to increase the stability and sensitivity of the working electrode as a formaldehyde biosensor with the cyclic voltammetry method. The profile of the cyclic voltammogram of the standard formaldehyde solution (1, 2, 3, 4, 5 mg/L) showed a typical pattern using a glassy carbon electrode and a chitosan-ZnO/glutaraldehyde electrode with a scan rate of 25 mV/s, 50 mV/ s, 75 mV/s, and 100 mV/s. The results of the analysis the samples of wet noodles have been achieved at a scan-rate of 100 mV/s and potential range -1000 to 1000 mV obtained formaldehyde concentrations in the range of 1-5 mg/L. The chitosan-ZnO/glutaraldehyde film layer was analyzed by FTIR and SEM-EDS. Keywords: Sensor, chitosan-formaldehyde, ZnO nanoparticles, voltammogram Topic: Analytical Chemistry |
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