Study of Three Kinds of Essential Oil on Antimicrobial Activity of Fruit Pathogenic Bacteria

Abstract:

Disc diffusion and direct contacting of essential oil and fruit pathogenic bacterias are utilized to study the effects of plant essential oil lavender essential oil，peppermint oil and grape seed oil on alternaria alternata，penicillium expansum and geotrichum candidum in this research. After analyzing the result of the research，we find out that in 1 ?滋L/L，2 ?滋L/L，3 ?滋L/L，4 ?滋L/L，5 ?滋L/L concentrations of these plant oils have unlike effects in fruit pathogenic bacteria of alternaria alternata，penicillium expansum and geotrichum candidum. And how we deal with the materials can influence the final result as well. In disc diffusion experiment the sensitivity towards lavender essential oil are alternaria alternate > penicillium expansum > geotrichum candidum，while the sensitivity towards peppermint oil are alternaria alternate > geotrichum candidum > penicillium expansum，and towards grape seed oil are penicillium expansum >alternaria alternate >geotrichum candidum. Whereas in the experiment of contacting essential oil and fruit pathogenic bacteria we got a different result. In 100 ?滋L/L，200 ?滋L/L，300 ?滋L/L，400 ?滋L/L，500 ?滋L/L concentrations of the plant oils .The sensitivity towards lavender essential oil are geotrichum candidum > alternaria alternata > penicillium expansum，which towards peppermint oil are geotrichum candidum > alternaria alternate > penicillium expansum，and that towards grape seed oil are penicillium expansum > geotrichum candidum > alternaria alternata.