VSC Adsorption Capability of Layered Double Hydroxide Containing Iron

Most etiology of bad breath is often concerned with gram-negative anaerobic bacteri, and pharmacotherpy using pharmaceutical drugs should be effective but limited, because bacteria at deep periodontal pocket may be sterilized but cannot be washed out and the malodorous compounds remain. The absorbents for the malodorous compound such as volatile sulfur compounds (VSC), hydrogen sulfide (H2S), are expected to prevent the teeth from decaying and peiodontics disease. The VSC adsorption capabilities of layered double hydroxides, of which composition is A(1-x)B(x)(OH)(2)C-x/n center dot mH(2)O, where A and B are Mg and Fe ions, and C are carbonate (CO32-: MgFe HTCO3) and chlorine (Cl-: MgFe HTCl) ions in aqueous medium was studied by GC/FPD. The concentration of H2S rapidly decrease to less than 15% for first 1 hours of soaking in H2S water and fell to 0% in 4-5 h when the MgFe HTCO3 and MgFe HTCl were used. The iron ion was not detected in the H2S water after soaking for 18 hours. The MgFe HTCO3 and MgFe HTCl are expected to be likely adsorbent for the fast removal of VSC from the mouth.