Identification Of Caffeine In Extracts Of Camellia Sinensis By Liquid Chromatography. Journal of Pharmaceutical Negative Results, [S. l.], p. 1045–1050, 2023. DOI: 10.47750/pnr.2023.14.S02.127. Disponível em: https://pnrjournal.com/index.php/home/article/view/6905.. Acesso em: 7 jun. 2026.