Antibacterial activity of leaf essential oil and its constituents from Cinnamomum longepaniculatum.

摘要: Staphylococcus aureus ATCC 25923, Escherichia coli 25922 and Salmonella enteritidis CMCC (B) 50041, were used in the antibacterial tests of Cinnamomum longepaniculatum leaf essential oil its five chemical constituents. The effect 1, 8-cineole on ultrastructural structure bacteria (S. E. coli) was also investigated by transmission electron microscopy. C. constituents showed variable levels inhibition. Their MIC ( minimum inhibitory concentration ) MBC (minimal bacteriocidal concentration) values all range 0.781 µL/mL~6.25 µL/mL µL/mL~12.5 respectively except γ-terpinene. γ-terpinene against S. higher than 50 µL/mL, but only 3.125 µL/mL. Among them, α-terpineol possessed best activity. Under microscope, cell size treated decreased, wall membrane ruptured, nucleoplasm reduced gathered onto side. After with 8-cineole, shape damaged nucleus cytoplasm concentrated or agglomerated These results suggest that have excellent activities, mechanism might attributable to hydrophobicity.