Activity of antibacterial compounds immobilised on montmorillonite

Antibacterial Activity of Cetyltrimethylammonium Bromide Modified Silver-Bentonite

“…The antibacterial assay was carried out in solution where the samples in powder form were added in bacteria solution either in distilled water or saline solution. Thus, the Ag ions could release into the solution from bentonite framework and eventually kill the bacteria cells [13,15]. Additionally, the antibacterial activity of the Ag-bentonite was also affected by different concentrations of saline solution (0.1 % > 1.0 % > 5.0 %).…”

“…2). CTAB on its own (free CTAB) has antibacterial activity [13] however, the antibacterial activity of CTAB was reduced after loaded on bentonite because of the attachment of CTAB molecules on bentonite prevents the movement of CTAB molecules in the solution. This result is in agreement with the work done by Malachova et al [13] where CTAB modified montmorillonite showed lower antibacterial effects by 18 orders of magnitude as compared to CTAB itself.…”

“…At 5.0 % of saline solution, Ag-bentonite showed no antibacterial activity. This is mainly due to the reaction between Ag ions that released from bentonite with the chloride ions in the saline solution forming precipitate AgCl [13,26]. Precipitation of the AgCl in the bacteria solution reduced the antibacterial activity since the free Ag ions are no longer exist in the bacteria solution to kill the bacteria.…”

“…The use of inorganic carrier to support antibacterial compounds could increase their antibacterial efficiency and could control the release of Ag ions. In previous studies, some of the ideal carrier system for antibacterial agents were montmorrilonite (a type of clay) [13][14][15], kaolinite [16], zeolite [17][18][19] and bentonite [20][21].…”

“…Therefore, combination of cationic surfactant and Ag could be developed on the support system such as bentonite. Cationic surfactant and Ag supported on the bentonite could firstly be prepared by loading bentonite with Ag ions [13] from AgNO 3 solution through ions exchange technique [15] so that the Ag ions are located inside the bentonite framework structure followed by the attachment of the cationic surfactant on the prepared Agbentonite [17,20].…”