Abstract:

In this study, the Aloe vera L. anthraquinones has been extracted by ultrasonic extraction and its content has been determined. The antibacterial effect of the Aloe anthraquinones on the Bacillus subtilis, Escherichia coli, Staphylococcus aureus has been investigated. The filter paper method, solid dilution method and minimum inhibitory concentration (MIC) method have been used to determine the antibacterial effect of the Aloe anthraquinones, and the efeects of this three methods have been compared. The solid dilution method showed that the high concentration of Aloe anthraquinone extract had the significant antibacterial effect. The minimum inhibitory concentration (MIC) was 90% for E. coli and S. aureus, and 80% for B. subtilis. The MIC of the Aloe anthraquinones showed a higher values, that meant antibacterial activity of Aloe anthraquinones was limited, only the Aloe anthraquinones with higher concentrations can inhibit the bacteria growth.