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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. JSK 2024, 4 (6), 577–584.