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An attempt was made to detach bacterial biofilm, formed by Staphylococcus epidermidis, by using hydrogen peroxide (H(2)O(2)) and tungsten compounds. When iron(II) (Fe(2+)) was mixed with undecatungstophosphate ([PW(11)O(39)](7-)) and then H(2)O(2), the resulting mixture was able to totally remove the biofilm probably because of co-generation of (1)O(2) and .OH. A mixture of undecatungstosilicate ([SiW(11)O(39)](8-)) and Fe(2+) (or Cu(2+)) also gave a good result, but their catalytic activities for producing .OH (or (1)O(2)) were rather weak. An electron microscopic study showed that almost nothing was visible on the surface of a biofilm-coated glass after treatment with 1mM [PW(11)O(39)](7-)+1 mM Fe(2+) and 500 mM H(2)O(2) (incubated for 1 h at 37 degrees C).

11-Tungstophosphate with Iron(II) and Hydrogen Peroxide Efficiently Detached Bacterial Biofilm