Fig. (2) Radial diffusion growth inhibition assay. Tryptic soy agar plate contained about 4 x 106E. coli. The pH of the balsam foliage water extract was adjusted to 7 and 10 using 0.01M NaOH. Powder BSA was added to the foliage extract until no more precipitate was formed.Upper row: balsam foliage water extract at pH5, 7 and 10. Lower row: balsam foliage water extract saturated with BSA.