Analisis Kadar Kafein dalam Green Bean dan Roasted Bean Kopi Robusta (Coffea canephora) Temanggung Menggunakan Spektrofotometer UV: Analysis of Caffeine Levels in Green Bean and Roasted Bean of Robusta Coffee (Coffea canephora) Temanggung Using UV Spectrophotometer. J. Sains. Kes. 2024;4(6):577–584. Accessed April 19, 2025. https://jsk.ff.unmul.ac.id/index.php/JSK/article/view/474