ASHOUR, Safwan. A novel sensitive colorimetric determination of catecholamine drug in dosage form via oxidative coupling reaction with MBTH and potassium ferricyanide. Drug Analytical Research, Porto Alegre, v. 5, n. 1, p. 51–58, 2026. DOI: 10.22456/2527-2616.113058. Disponível em: https://seer.ufrgs.br/index.php/dar/article/view/113058. Acesso em: 3 aug. 2026.