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Study on Antimicrobial Activity of Flavonoids Extracted from Camellia japonica and Loropetalum chinese Flower

LIU Ru-long et al(College of Life Science,Jiangxi Normal University,Nanchang,Jiangxi 330022)  
[Objective]The research aimed to provide experimental references for antimicrobial activity study of plant secondary metabolites.[Method] It was studied on the antimicrobial activity to bacteria and fungi of flavonoids extracted from Camellia japonica and Loropetalum chinese flower with 70% ethanol.[Result] The results showed that flavonoids from Camellia japonica petal was lack of the antimicrobial activity to Escherichia coli,Staphylococcus aureus,Bacillus subtilis,an unknown bacterium(G+ bacterium).The anthoxanthins from the other part of Camellia japonica except petal and Loropetalum chinese flower could inhibit the growth of three kinds of bacteria,Staphylococcus aureus,Bacillus subtilis and the unknown bacterium,while there was no inhibition activity to Escherichia coli.[Conclusion] The flavonoids extracted from Camellia japonica and Loropetalum chinese flower with 70% ethanol had a better antibacterial activity.
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