Analysis Of Caffeine In Packaged Drinks Using Thin Layer Chromatography (TLC) and Spectrophotometry Method. Stannum : Jurnal Sains dan Terapan Kimia, [S. l.], v. 6, n. 1, p. 28–35, 2024. DOI: 10.33019/jstk.v6i1.4564. Disponível em: https://journal.ubb.ac.id/index.php/stannum/article/view/4564. Acesso em: 11 oct. 2025.