CC-BY-NC-NDTasić, ŽaklinaPetrović Mihajlović, MarijaSimonović, AnaRadovanović, MilanNujkić, MajaAntonijević, Milan2023-12-212023-12-212023978-86-6305-140-9https://ioc.tfbor.bg.ac.rs/public/2023/Proceedings_IOC_2023.pdfhttps://repozitorijum.tfbor.bg.ac.rs/handle/123456789/13Electrochemical methods are widely used for the determination of various chemical compounds due to their simplicity and short time for analysis, as well as enabling low detection limits. Various electrodes have been developed over the years, including those made from carbon materials, gold, mercury, as well as various modified electrodes for detection of analytes. Carbon electrodes are particularly favored as they possess low background current and high electrical conductivity. Also, they are relatively inexpensive, easy to prepare, and generally non-toxic. In this study, the sensor characteristics of a graphite electrode prepared from spent zinc-carbon batteries for the determination of tryptophan and caffeine have been investigated. Britton-Robinson and acetate buffers were used as electrolytes. The obtained results demonstrated that this electrode is a good electrochemical sensor for detecting tryptophan alone as well as in the presence of caffeine. Additionally, the modified graphite electrode is resulting in improved sensor characteristics for the determination of tryptophan in Britton-Robinson buffer. The results obtained by differential pulse and cyclic voltammetry highlight the potential of graphite electrodes as effective electrochemical sensors for the detection of analytes.enelectrochemical sensorzinc-carbon batteriescaffeinetryptophanmodified graphite electrodeconferenceObject