The Thai Journal of Veterinary Medicine
In Vitro Efficacy of Red Kwao Krua (Butea superba Roxb.) Extract Against Streptococcal bacteria Isolated from Diseased Tilapia (Oreochromis niloticus)
Streptococcal infection is a major problem in intensive tilapia farming. This study was conducted to investigate the antimicrobial activity of mucilage, distilled water- and 70% methanol-crude extract from Butea superba Roxb. against Streptococcal bacteria. The antimicrobial activity using disc diffusion assay showed that B. superba Roxb. had a broad antimicrobial range against twelve isolates of streptococcal bacteria: Streptococcus iniae (n=2) and Streptococcus agalactiae (n=10). The minimum inhibitory concentration (MIC) of the 70% methanol-crude extract varied between 128 and 512 µg/ml depending on the tested streptococcal strains. Mucilage has a higher potency in the inhibition of streptococcal bacteria when compared with the 70% methanol-crude extract. However, distilled watercrude extract had no efficiency of inhibiting the growth of microorganism.
Faculty of Veterinary Science, Chulalongkorn University
Pirarat, Nopadon; Rodkhum, Channarong; Ponpornpisit, Aranya; and Suthikrai, Wanwipa
"In Vitro Efficacy of Red Kwao Krua (Butea superba Roxb.) Extract Against Streptococcal bacteria Isolated from Diseased Tilapia (Oreochromis niloticus),"
The Thai Journal of Veterinary Medicine: Vol. 42:
1, Article 1.
Available at: https://digital.car.chula.ac.th/tjvm/vol42/iss1/1