IDENTIFICATION AND DETERMINATION OF CAFFEINE CONTENT IN BUTONG TEA AND BLACK TEA USING SOXHLET EXTRACTION AND TLC: IDENTIFIKASI DAN PENETAPAN KADAR KAFEIN TEH BUTONG DAN BLACK TEA DENGAN SOXHLETASI SERTA KLT. fj [Internet]. 2026 July 9 [cited 2026 Nov. 13];6(02):602-7. Available from: https://ojs.unhaj.ac.id/index.php/fj/article/view/2401