Determination Standardization and Validation of Optimized Spectrophotometric Assays for Total Antioxidant, Polyphenol, and Flavonoid Determination: A Kinetic and Methodological Framework. Sana’a University Journal of Applied Sciences and Technology, [S. l.], v. 4, n. 6, p. 2166–2177, 2026. DOI: 10.59628/jast.v4i6.2774. Disponível em: https://journals.su.edu.ye/index.php/jast/article/view/2774. Acesso em: 28 jun. 2026.