Development and validation of an analytical method by HPLC-DAD for determination of caffeine in products based on guarana extracts (Paullinia cupana). Braz. J. Pharm. Sci. [Internet]. 2023 May 15 [cited 2024 Dec. 26];59:e22106. Available from: https://revistas.usp.br/bjps/article/view/212197