“…Preservatives are chiefly effective in preventing bacterial proliferation, inhibiting yeast and controlling mold growth 1,2 . But, in many cases emergence of microorganisms resistance to existing chemical preservatives, for instance, sorbic acid, benzoic acid, triclosan, paraben, methyl-paraben, propyl-paraben, glutaraldehyde, formaldehyde, imidazolidinyl urea, chlorhexidine, dimethyl dimethylol hydantoin, and quaternary ammoniums compounds has been well reported 3,4 .…”