UJI EFEKTIVITAS EKSTRAK RIMPANG LENGKUAS MERAH (ALPINIA PURPURATA K.SCHUM) SEBAGAI ANTIBAKTERI ESCHERICHIA COLI PENYEBAB DIARE

The research has been done in the period of March to April 2009, using Completely Randomized Design. This research was aimed to find out the effective concentration of rhizome extract using n-hexana and methanol for inhibiting growth of E. coli. The rhizomes were extracted by maseration method using n-hexana and methanol which determined into five levels of concentration 3.5%, 4.25%, 5%. 5.75% and 6.5%, and tetracycline solution as the comparison factor. The antibacterial test was using paper disc diffusion method. As the result, the largest diameter of inhibition from the rhizome that extracted by using n-hexana was at concentration of 4.25% (9.5 mm), while rhizome that
extracted using methanol resulted the the largest diameter of inhibition at the concentration of 5.75% (8.16 mm), and tetracycline was 10,33 mm. It could be concluded the rhizome
that ectracted using n-hexana and methanol did not significantly affect to inhibit the growth of Escherichia coli.