Three melaleuca alternifolia tea tree oil from Guangxi

Jiangxi and Guangdong province

they are introduced from Australia

were separately into different components by fractional distillation

then make sure the main chemical composition by GC/MS. By means of antibiotic experiment with colibacillus and staphylococcus aureus

through contrast research the antimicrobial activity of the different fraction. Results indicated that the chemical components of the three kinds of tea tree oil were in great diversity. The characteristic composition terpine -4-ol accounted from 0.78%~43.59%

while the noncharacteristic composition 1

8cineole accounted from 2.14%~72.49%. The three kinds of tea tree oil were in great diversity，but they all have strong antimicrobial activity to the Staphylococcus aureus and the colibacillus

the active constituent of the three kinds of tea tree oil were 1

8cineole. While the main component content

such as terpinen-4-ol，γ-Terpinen

α-Terpinen，-p--Cymene.et，have no significant correlation with antibiotic activity.