In Vitro Efficacy of Red Kwao Krua (Butea superba Roxb.) Extract Against Streptococcal bacteria Isolated from Diseased Tilapia (Oreochromis niloticus)

Authors

Nopadon Pirarat
Channarong Rodkhum
Aranya Ponpornpisit
Wanwipa Suthikrai

Abstract

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.

DOI

10.56808/2985-1130.2353

First Page

101

Last Page

105

Recommended Citation

Pirarat, Nopadon; Rodkhum, Channarong; Ponpornpisit, Aranya; and Suthikrai, Wanwipa (2012) "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: Iss. 1, Article 1.
DOI: https://doi.org/10.56808/2985-1130.2353
Available at: https://digital.car.chula.ac.th/tjvm/vol42/iss1/1