Comparative Studies on Antioxidant Activities of Different Lactic Acid Bacterial Strains

Objective:In order to provide theoretical evidences for developing novel natural antioxidants,antioxidant activities of different lactic acid bacterial strains were compared in this paper.Methods:The antioxidant capabilities and reducing activities of 35 lactic acid bacterial strains from intact cells,cell-free extracts and extracellular secretions were evaluated through scavenging capabilities of hydroxyl,superoxide anion and DPPH free radicals.Results:La 5 and La 29 displayed the excellent antioxidant activity among 35 lactic acid bacterial strains.Conclusion:Different fractions from lactic acid bacteria have different scavenging capabilities in vitro.Therefore,lactic acid bacteria from difference resources,concentrations and excretion places also exhibited different antioxidant activities.