Antioxidant activities of 1,1-diphenyl-2-picrylhydrazyl by Phaffia rhodozyma and Rhodopseudomonas palustris

Objective To study the scavenging activities of <em>Phaffia rhodozyma</em> and <em>Rhodopseudomonas</em> <em>palustris</em> on DPPH free radicals. Methods The DPPH free radical method was used to study the difference in the scavenging ability of the whole cells and ethanol extracts of two microorganisms. Results <em>R. palustris</em> showed much higher antioxidant activity than <em>P. rhodozyma</em> in scavenging DPPH. Conclusion The application of <em>R. palustris</em> in antioxidants is worth exploring.