纳米ZnO/LDPE抗菌食品包装材料研制  

Preparation of A Nano-structural ZnO/LDPE Antimicrobial Food Packaging Material

作　　者：高艳玲[1] 姜国伟[2] 张少辉[1] 

机构地区：[1]上海交通大学农业与生物学院,上海200240 [2]中国科学院应用化学研究所,吉林长春130022

出　　处：《食品科学》2010年第2期102-105,共4页Food Science

摘　　要：以低密度聚乙烯作为食品包装的基材,将活化处理的纳米级ZnO通过融熔共混的方法添加到基材中,再将所得的粒料经过单螺杆挤出机及吹膜机吹塑成薄膜,即制得抗菌型纳米改性聚烯烃复合材料。以大肠杆菌、枯草芽孢杆菌、金黄色葡萄球菌、鼠伤寒沙门氏菌、单核增多性李氏杆菌、铜绿假单胞菌6种食品中常见的污染菌作为测试菌株,在3种不同条件下对其抗菌性能进行测试。结果表明:该材料对其中的4种细菌具有明显的抗菌作用,在自然光、室温下材料的抗菌能力较强;在6种细菌中对枯草芽孢杆菌的抗菌作用最强,其抗菌率在室温且有自然光照射的条件下达到最高值99.99%,在37℃、无光照的条件下最低为95.01%。A nano-structural ZnO/LDPE antimicrobial food packaging material was developed through the following steps： in the first step, activated nano-structural ZnO was dispersed into low density polyethylene （LDPE）, a matrix material, by dissolving-melting-blending technique; in the second step, the resulted particulate polymer composite was blown into film by sequential treatment with a single screw extruder followed by a plastic film blowing machine; and finally the target product was obtained. Six species of common food-contaminating bacteria including Escherichia coliform, Bacillus subtilis, Staphylococcus aureus, Salmonella aertrycke, Listeria monocytogenes and Pseudomonas aeruginosa were used for testing the antimicrobial capability of the material under different illumination conditions： energy-saving lamp light （5 W, （37 ± 1） ℃）, darkness （37 ±1） ℃ and sunlight （20 ± 1） ℃. Results showed that the material had a significant antimicrobial activity against four of the 6 species of food-contaminating bacteria, which was stronger under sunlight than under other illumination conditions. Of all the tested bacterial species, the strongest inhibitory effect against Bacillus subtilis was observed, with a maximum inhibitory rate as high as 99.99% under sunlight illumination and a minimum value of 95.01% in darkness.

关 键 词：纳米氧化锌 抗菌 食品包装 低密度聚乙烯 

分 类 号：TS206.4[轻工技术与工程—食品科学]