Efficacité de huit désinfectants sur trois types de surfaces contaminées par Pseudomonas aeruginosa

The disinfecting capacity of eight commercial chemical products was evaluated by the use--dilution method given by the Associated of Official Analytical Chemists (AOAC) on three types of surface material (steel, aluminum, and plastic). For most products tested the limit concentration was 10 times higher for disinfecting aluminum and plastic surfaces than stainless steel. As observed on the scanning electron microscope, the number of bacteria deposited on the surface and the production of extracellular material on polypropylene by Pseudomonas aeruginosa ATCC 15442 would explain the observed differences. The applicability of the AOAC method or other techniques for the evaluation of the disinfecting capacity on different surfaces is discussed.