IC₅₀ (half-maximal inhibitory concentration) is a crucial parameter in antioxidant studies, representing the concentration of a substance required to inhibit 50% of free radicals (e.g., DPPH, ABTS, or FRAP assays)
The most reliable mathematical models for determining IC₅₀ in antioxidant assays include logistic, Boltzmann (sigmoidal), dose-response, and asymmetric sigmoidal models. These models offer varying degrees of accuracy and reproducibility, with the asymmetric sigmoidal model often providing the most accurate results.