Fig. 4

Antioxidant activities of the secondary metabolites of Streptomyces sp. CMSTAAHL-4. DPPH radical scavenging activity (a); Hydroxyl radical scavenging activity (b); ABTS radical scavenging activity (c); Hydrogen peroxide scavenging activity (d); Nitric oxide scavenging activity (e) and total antioxidant capacity (TAC) (f)