摘要
以新型纳米Fe3+-TiO2、紫胶、琥珀酸单甘油酯(succinylated monoglycerides,SMG)添加量为影响因素,对乳化紫胶聚乙烯醇(polyvinyl alcohol,PVA)溶液体系改性,以成膜透湿率为指标,通过响应面试验方法优化复合膜制备工艺,并对复合膜抑菌性能进行研究。结果表明:紫胶协同纳米Fe3+-TiO2交联改性PVA能显著降低PVA基膜材料的透湿率(P<0.05);复合膜中紫胶添加量与纳米Fe3+-TiO2及SMG添加量对成膜透湿率有显著的交互作用(P<0.05);以复合膜透湿率为指标的回归优化结果:纳米Fe3+-TiO2添加量9.18 mg/100 m L、紫胶添加量1.33 g/100 m L、SMG添加量0.92 g/100 m L,此时成膜透湿率为(392.43±8.37)g/(m2·24 h),比PVA单膜降低了60%以上;复合膜在可见光催化反应180 min后,与PVA单膜相比,沙门氏菌和李斯特菌的活菌数量分别降低1.8(lg(CFU/m L))和1.6(lg(CFU/m L)),说明纳米Fe3+-TiO2改性PVA基紫胶复合涂膜材料能赋予其可见光催化靶向抑菌性能。
The preparation of nano-Fe3+-TiO2 modified PVA/shellac composite film was optimized in the present study. NanoFe3+-TiO2 particles were used to modify polyvinyl alcohol(PVA) solution, and succinylated monoglycerides(SMG) was used to emulsify and stabilize PVA/shellac solution, and then the solution was dried to form a film. By using the concentration of nano-Fe3+-TiO2, shellac and SMG as the experimental factors and moisture permeability as the response variables, we optimized the film formation process by response surface methodology. Antibacterial properties of composite films were investigated. The results showed that shellac and nano-Fe3+-TiO2 modified PVA could significantly reduce the water vapor transmission rate of the PVA-based film material(P < 0.05). Shellac concentration had significant interaction effects on the water vapor transmission rate with nano-Fe3+-TiO2 and SMG concentration(P < 0.05). The optimal concentrations of Fe3+-TiO2 nanoparticles, shellac and SMG were 9.18, 1.33, and 0.92 g/100 m L, respectively. These results indicated that appropriate proportion of different components could achieve the lowest water vapor transmission rate for the composite film. Under visible light irradiation, the composite film produced by the optimized process conditions had high antibacterial properties, and the viable cell numbers of Salmonella and Listeria were reduced by 1.8(lg(CFU/m L)) and 1.6(lg(CFU/m L)) after photocatalysis for 180 min, respectively, compared with single PVA films.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2015年第4期50-57,共8页
Food Science
基金
安徽省高校特色专业建设项目(20101032)
“十二五”国家科技支撑计划项目(2012BAD28B01)
关键词
纳米Fe3+-TiO2
聚乙烯醇
紫胶
成膜透湿率
光催化抑菌
nano-Fe3+-TiO2
polyvinyl alcohol(PVA)
shellac
water vapor transmission
photocatalytic antibacterial property
