Determination Standardization and Validation of Optimized Spectrophotometric Assays for Total Antioxidant, Polyphenol, and Flavonoid Determination: A Kinetic and Methodological Framework. (2026). Sana’a University Journal of Applied Sciences and Technology, 4(6), 2166-2177. https://doi.org/10.59628/jast.v4i6.2774