Anti-bacterial activity of extracts from Heptacodium miconioides

Key words: 
• botany /
• Heptacodium miconioidesl /
• organs /
• anti-bacterial activity /
• rare and endangered plants

Abstract: Heptacodium miconioides is a rare and endangered plant .Different organs of Heptacodium miconioides including flowers , leaves , and so on , were extracted with different solvents such as 70 % ethanol , 60 %acetone and boiled water .The anti-bacterial activity of the extracts was detected on 4 experimental strains , such as Staphylococcus aureus , Bacillus thuringiensis , Pseudomonas aeruginosa and Escherichia coli .The results showed that in terms of the diameter of anti-bacterial zone of extracts from leaves and flowers with different solvents , the anti-bacterial activity of ethanol extract was the highest , while that of acetone extract took the second place and that of boiled water extract was the lowest .Anti-bacterial activity could be detected in the extracts of different organs of Heptacodium miconioides , and those from leaves and flowers were relatively higher while those from old stem and old root were relatively lower .The diameter of the anti-bacterial zone of ethanol extracts from leaves on 4 experimental strains was 7.67 , 9.67 , 10.00 and 100.00 mm , respectively , while that from flowers was 10.00 , 12.70 , 11.00 and 11.00 mm , respectively .Minimum inhibitory concentration (MIC )of flowers and leaves on Bacillus thuringensis and Escherichia coli were all 50 gL-1 and those on Staphylococcus aureus were all 100 gL-1 .Those on Pseudomonas aeruginosa were 50 and 100 gL-1 , respectively .The anti-bacterial activity of ethanol extracts from leaves and flowers ranked in turns :Bacillus thuringiensis , Escherichia coli , Pseudomonas aeruginosa , and Staphylococcus aureus .[ Ch , 4 tab .14 ref .]