聚乳酸/牛至精油抗氧化活性包装膜的制备及性能研究  

Preparation and properties of polylactic acid/oregano essential oil antioxidant active packaging film

作　　者：戴璐 张子怡 薛雯[1] 沈静 唐丽丽[1] 龙明华[1] DAI Lu;ZHANG Zi-yi;XUE Wen;SHEN Jing;TANG Li-li;LONG Ming-hua(Biological Engineering Faculty,Yangling Vocational&Technical College,Yangling 712100,Shaanxi,China)

机构地区：[1]杨凌职业技术学院生物工程分院,陕西杨凌712100

出　　处：《湖北农业科学》2021年第9期110-112,126,共4页Hubei Agricultural Sciences

基　　金：陕西省自然科学基础研究计划项目(2021JQ-901);杨凌职业技术学院自然科学研究基金项目(A2019044)。

摘　　要：以聚乳酸为基材、牛至精油为抗氧化活性成分、司班80为增塑剂,通过流延成膜工艺制备聚乳酸/牛至精油抗氧化活性包装膜并对其性能进行测定,通过测定拉伸强度、断裂伸长率及弹性模量评价牛至精油对聚乳酸包装膜力学性能的影响,测定水蒸气透过率及氧气透过率评价牛至精油对聚乳酸包装膜阻隔性能的影响,测定自由基清除率评价牛至精油对聚乳酸包装膜抗氧化性能的影响。结果表明,聚乳酸/牛至精油膜材料具有较好的抗氧化性能且其抗氧化效果随牛至精油添加量的增加而增强,添加不同量的牛至精油对聚乳酸膜的包装性能有不同程度的影响。当牛至精油添加量达到1.5%时,聚乳酸/牛至精油膜的自由基清除率可达82.6%,此时膜材料的厚度显著增加至(136.2±6.0)μm,拉伸强度、弹性模量分别显著下降至(10.0±0.9)MPa、(22.7±3.0)MPa,断裂伸长率轻微下降至(343.4±18.2)%,水蒸气透过率显著降低至(34.7±1.2)g/m^(2)·24 h,氧气透过率增高至(988.3±39.6)mL/m^(2)·24 h·atm。The polylactic acid/oregano essential oil antioxidant activity packaging films were prepared by a casting method using polylactic acid as the substrate,oregano essential oil as the antioxidant active component and Siban 80 as the plasticizer,and their properties were tested.The influence of oregano essential oils on the mechanical properties of polylactic acid packaging films was evaluated by measuring tensile strength,elongation at break and elastic modulus,the influence of oregano essential oils on the barrier propertiesof polylactic acid packaging films was evaluated by measuring water vapor transmission rate and oxygen transmission rate,the influence of oregano essential oils on the antioxidant properties of polylactic acid packaging films was measuredby radical scavenging rate.The results showed that the polylactic acid/oregano essential oil films possessed good antioxidant properties and the antioxidant effects increased with the increase of oregano essential oilconcentration.The addition of different amount of oregano essential oils had different effects on the packaging performance of polylactic acid packaging films.When oregano essential oil content reached 1.5%,the free radical scavenging rate of the polylactic acid/oregano essential oil film reached 82.6%.At this time,the thickness of the film material increased significantly to(136.2±6.0)μm,the tensile strength and elastic modulus were respectively significantly decreased to(10.0±0.9)MPa and(22.7±3.0)MPa,the elongation at break decreased slightly to(343.4±18.2)%,the water vapor transmission rate was significantly decreased to(34.7±1.2)g/m^(2)·24 h,and the oxygen transmission rate was slightly increased to(988.3±39.6)mL/m^(2)·24 h·atm.

关 键 词：聚乳酸 牛至精油 抗氧化活性 包装 

分 类 号：S377[农业科学—农产品加工] TS206.4[农业科学—农艺学]