The discovery of various activities of natural plants has increased interest in halophytes. Suaeda australis and S. maritime are perennial halophytes that belong to the Chenopodiaceae family. Extracts of S. australis and S. maritime plants were investigated for concentration and time-dependent antibacterial and antioxidant activities using bacterial species and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, respectively, as well as total phenolic content. The S. australis extract (500 μg/mL) showed activity against all the bacterial species including P. aeruginosa, P. mirabilis, A. baumannii, and VRE with 61.1, 42.3, 44.49, and 40.38%, respectively, inhibition and suppressed of these four species for 12 h. Overall, the S. australis extract showed marked antibacterial activities while, in contrast, the S. maritime extract had excellent antioxidant effects. However, the effects of the two extracts were much lower than that of quercetin. The present study identified antibacterial activities of S. australis, and it would be necessary to perform further phytochemical studies of S. australis.

• Hye-Ran Kim(Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 609-757, Korea)
• Gyu-Nam Park(Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 609-757, Korea)
• Bo-Kyoung Jung(Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 609-757, Korea)
• Weon-Jong Yoon(Jeju Biodiversity Research Institute, Jeju Technopark, Jeju 699-121, Korea)
• Yong-Hwan Jung(Jeju Biodiversity Research Institute, Jeju Technopark, Jeju 699-121, Korea)
• Kyung-Soo Chang(Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 609-757, Korea) Corresponding author