Abstract: In this research, bagasse was used as a carrier for nano silver oxide to prepare a new environmentally friendly preservative. Sucrose ester was used as a surfactant in the reaction between sodium hydroxide and silver nitrate. Nano silver oxide was adsorbed onto bagasse in an ultrasonic field. The optimal conditions for product formation were determined with respect to NaOH, AgNO3 and sucrose ester concentration, reaction time and ultrasonic power. The product was characterized by X-ray diffraction and scanning electron microscopy (SEM). Its antibacterial properties against Escherichia coli and Bacillus subtilis were examined by determining its minimum inhibitory concentration (MIC). The results showed that nano silver oxide with the lowest particle size of 63.38 nm was prepared under the conditions of 0.02 mol/L AgNO3, 0.03 mol/L NaOH, 1.4 g/L sucrose ester, temperature 40 ℃, reaction time 110 min, and ultrasonic power 400 W. The MICs were 289.662 5 and 579.325 μg/mL for E. coli and B. subtilis, respectively.

Key words: bagasse, nano silver oxide, preservative