FAZAL-UR-REHMAN, M.; QAYYUM, Iqra; MANZAR ZAHRA, Dr. Isolation of natural caffeine from liptonâ„¢ black tea through acid-base liquid-liquid extraction approach, its medical significance and its characterization by thin layer chromatography and IR analysis. International Journal of Advanced Chemistry, [S. l.], v. 9, n. 1, p. 29–33, 2021. DOI: 10.14419/ijac.v9i1.31458. Disponível em: https://sciencepubco.com/index.php/IJAC/article/view/31458.. Acesso em: 5 may. 2024.