Electrochemical detection of melatonin using Gd-doped ZnO nanoparticles modified carbon paste electrode: Original scientific paper. Journal of Electrochemical Science and Engineering, [S. l.], v. 16, 2025. DOI: 10.5599/jese.2914. Disponível em: https://pub.iapchem.org/ojs/index.php/JESE/article/view/2914. Acesso em: 22 may. 2026.