蔗渣-纳米氧化银保鲜剂的制备

以蔗渣作为纳米氧化银的载体制备一种新型环保的保鲜剂。以蔗糖酯为表面活性剂，将其加入NaOH和AgNO3反应体系中，在超声场环境下用蔗渣吸附反应体系中的纳米氧化银，实验过程中通过改变NaOH、AgNO3浓度、蔗糖酯质量浓度、超声场中的反应时间和功率确定产物生成的最佳条件。通过X射线衍射和扫描电镜对样品进行表征，并通过研究蔗渣-纳米氧化银保鲜剂对大肠杆菌和枯草芽孢杆菌的抑菌性能，确定蔗渣-纳米氧化银抗菌液的最小抑菌浓度。结果表明：AgNO3浓度0.02 mol/L、NaOH浓度0.03 mol/L、蔗糖酯质量浓度1.4 g/L、反应温度40 ℃、反应时间110 min、超声功率400 W条件下制得的纳米氧化银粒径最小，为63.38 nm；蔗渣-纳米氧化银抗菌液对大肠杆菌和枯草芽孢杆菌的最小抑菌浓度分别为289.662 5 μg/mL和579.325 μg/mL。

Preparation of Bagasse-Nano Silver Oxide Preservative

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.