Abstract

Streptomyces species, KB1 and KB3, were isolated from air samples collected from Aonang, Krabi province, Southern Thailand. The strain KB3 was found to be an efficient pigment (dark brown) producer and has been selected for further studies. Both strains were used to study for antioxidant activity. The fraction extracts with ethyl acetate (EA), hexane (HE) and methanol (MT) possessed DPPH free radical scavenging activity, especially pigment extracted from KB3 with MT (KB3-MT). The results of antioxidantactivity produced by the Streptomyces species clearly indicated that the actinomycetes are source of bioactive compounds for usefulness in pharmacological strategies.