In our preliminary screening, the number of bacterial
strains was determined in accordance with their cell wall
structure. Sensitive strains of Gram negative and Gram positive
bacteria were chosen assuming that one strain each of
Gram positive and Gram negative bacteria is enough for the
screening of antibacterial activity of the extracts. S. aureus and
E. coli were used in this antimicrobial testing because of their
medical significance in causing common problems of bacterial
infections in hospitals. Based on this screening, out of three
different extracts tested, only methanol extract of A. paniculata
exhibited the antibacterial activity.