1Department of Biochemistry, College of Engineering, Gandhi Institute of Technology and Management, Visakhapatnam, Andhra Pradesh 530 045, India
2Department of Biochemistry, College of Science and Technology, Andhra University, Visakhapatnam, Andhra Pradesh 530 045, India
*Corresponding author; E-mail: ramaraomalla@rediffmail.com Tel: 91 891 2840464, Fax: 91 891 2790032
The antimicrobial activity of the extracts of Artemisia nilagirica, Achyranthes aspera, Amomum subulatum, Aristolochia indica and Andrographis paniculata against Gram positive and Gram negative bacteria was studied in vitro. The results showed that the minimum inhibitory concentration of A. nilagirica leaf extract is 20mg/ml against E. coli. However, the minimum inhibitory concentration of A. aspera whole plant extract against S. aureus and B. subtilis are 30 µg/ml and 50 µg/ml respectively, Whereas that of A. subulatum seed extract is 40mg/ml against K. pneumoniae. The growth of all the microorganisms tested except E. coli is inhibited by A. indica root extract with MICs ranging from 20–100µg/ml.
Plant extracts, Antimicrobial, Minimum inhibitory concentrations
