The antibacterial activity test galanga (Alpinia galangal) on the growth of becteria Bacillus subtilis and Escherichia coli

Abstract

This research was conducted to test the effectiveness of antibacterial inhibition of galangal (Alpinia galanga L.) on the growth of Escherichia coli and Bacillus subtilis bacteria with concentration 0%, 15%, 30%, 45%, 60%, 75%, 90%, 100 %. The method used in this study with the Kirby-bauer disc diffusion method with 0% concentration as negative control. The results showed that galangal (Alpinia galanga L.) at 100% concentration had the highest inhibition area in Bacillus subtilis (1,13 mm) and E. coli (0,8 mm). Galangal has more effective antibacterial activity in Bacillus subtilis bacteria than E. coli.