Salvianolic acid A (Sal A) and salvianolic acid B (Sal B) were isolated and purified from the crude extract of Salvia miltiorrhiza. Antioxidant activities of Sal A and Sal B were also evaluated and the ABTS results showed that Sal A and Sal B exhibited high total antioxidant activities, their EC50 values were 1.35 0.00 and 1.43 0.01 .mu.g/mL. This compound always contains a significant amount of residual solvent.
According to the existing research, Salvianolic acid B plays potential role in modulating inflammation, cell signaling, and immune responses by inhibiting the expression of COX, ERK, TNF-α, NO.', 'Salvianolic acid B has anti-obesity, antiviral (COVID-19) and free radical scavenging activity.
