Extraction of Total Falconoids from Mikania Micrantha and Study of Antibacterial Activities.

Zhang Min; Han Ya-li

With the falconoids extraction rate as index, total ffavonoids from Mikania Micrantha leaves were extracted by the ultrasonic assistance method, and the extraction process was optimized by the orthogonal design. Moreover, the in vitro antibacterial activity (inhibition zone diameter) and minimum inhibitory concentration ( MIC ) of the above product against Staphylococcus aureus, Escherichia coli, Salmonella and Shigella were identified by the diffusion method and test tube method respectively. The results show that the optimum extracting conditions are as follows: ethanol concentration is 50%, the ratio of material to 1iquid 1:30, ultrasonic power 50 W, and time 50 min, and the extracting rate of leaves is 10.62%. Under such conditions, the above extract of ffavonoids has good antibacterial activities against Staphylococcus aureus, Escherichia coli, Salmonella and Shigella, and the MIC is 1.562 5, 1.562 5, 3.1250, 3.1250 mg/mL respectively (calculated through the flavonoid quality concentration).

Journal of Guangdong University of Technology, 2014, Vol 31, Issue 2, p133

1007-7162

Academic Journal

10.3969/j.issn.1007-7162.2014.02.026