Actinomycetes ofOrthosipon siamineus rhizosphere as producer of antibacterial compound against multidrug resistant bacteria

摘要

The increasing case of antibiotic resistance has become an important problem to be faced in treating the infection diseases. The diversities of microbia. especially actinomycetes bacteria which originated from rizosphere soil of-medicinal plant, has opened a chance for discovering the metabolites which can be used m solving the antibiotic resistant pathogenic bacteria problems. The aim of this research was to isolate the actinobaetcria originated from medicinal plant rizosphere of Orthosipon stamineut as the producer of anti-multidrug resistances bacteria compounds. Three isolates of actinomycetes has been isolated from Orlhosipon stamincus rhizosphere named KC3-1. KC3-2 and KC3-3. One isolate (KC3-3) showed big activity in inhibiting the test microbes by antagonistic test of actinomycetes isolates against Staphylococcus aureus, and Eschericia coli antibiotic resistant bacteria. Furthermore, the KC3-3 isolate was fermented in Starch Nitrate Broth (SNB) medium for 14 days. The supernatant and the biomass of the fermentation yield were separated. The supernatant were extracted using ethyl acetate as the solvent and the biomass were extracted using methanol. The antibacterial activity test of ethyl acetate and methanol extract revealed that the extracts cart inhibit the bacteria test up to 5% concentration. The ethyl acetate and methanol extracts can inhibit the bacteria test up to 5% concentration.