Antimicrobial test were carried out by disc diffusion method using 100 ll of bacterial suspension containing 2.0 _ 108 CFU/ml in sterilized Petri dishes 90 mm in diameter. The paper discs (6 mm in diameter) were impregnated with 20 ll of each biocide dilution. Antimicrobial activity was evaluated by measuring the zone of inhibition against the test microorganisms.