This study was observed to the effect of the feeding Platycodon grandiflorum A. DC (3 years) extract on the bronchus diseases bacteria ( C. diphtheriae, S. aureus, Mycobacterium sp., F. nucleatum, S. pygogenes, K. pneumoniae and N. gonorrhoeae) and fungi(A. fumicatus). Platycodon grandiflorum A. DC was extracted ethanon, water, ethyl ether and petroleum ether. The extraction rate of Platycodon grandiflorum A. DC to the extract solution was identified 71.8%, 100%, 15.4% and 14.1%. Each extract solution was injected culture media into several concentrations and then investigated the bacteria cell growth during 32 hours. As a result antimicrobial activity was excellent an extract by ethyl ether and petroleum ether. Among several concentrations, bacteria cell growth inhibition was observed from 0.06% to 0.14%. The rate of antimicrobial activity was over 70%. The cell growth inhibition rate of each bacteria was appeared in order of ethyl ether > petroleum ether > water > ethanol.
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