
草莓保鲜膜的制备与性能研究
张晔, 崔立东
草莓保鲜膜的制备与性能研究
Preparation and Properties Study of Strawberry Cling Film
由于石油基塑料资源的供应日益减少,生物质资源的开发受到研究人员的广泛关注,对环保型抗菌包装材料的研究日益成为一种新兴趋势。来源于生物质的纳米纤维素(cellulos nano-cellulose,CNC)尤其引起关注,纳米纤维素近些年在包装材料、医疗和过滤介质等领域广泛研究应用,是一种良好的基材、改性剂和添加剂。聚乳酸(polylactic acid,PLA)是一种环保可再生型聚合物,可广泛应用到食品包装领域替代石油基塑料。但其高脆性和较差的抗菌性限制了PLA在包装领域的应用。为此,采用溶液浇铸法和静电纺丝法制备具有抗菌效果的F-PLA/香芹酚(CRV)20%/纳米纤维素(CNC)-氧化锌(ZnO)3%复合膜和PLA/CRV 20%/CNC-ZnO 3%复合膜,研究CRV和CNC–ZnO杂化物的添加对复合膜性能的影响;同时将2种复合膜应用于草莓保鲜试验当中,探讨其对草莓的保鲜效果。选用溶剂浇铸法制备的PLA/CRV20%/CNC–ZnO3%复合膜及静电纺丝法制备的F-PLA/CRV20%/CNC–ZnO3%复合膜在相同环境下对草莓进行保鲜,并通过感官评定、失重率等测试对草莓的保鲜效果进行评价,对比分析不同工艺方法制备的包装膜对草莓保鲜效果的影响。结果表明,浇铸膜和纺丝膜均对草莓保鲜效果较好,F-PLA/CRV20%/CNC–ZnO3%纺丝膜对草莓的保鲜效果优于PLA/CRV20%/CNC–ZnO3%浇铸膜,并在环境温度为25℃下成功延长草莓的货架期至10 d。此研究对拓展PLA复合膜在抗菌食品包装的应用具有一定指导作用。
Due to the decreasing supply of petroleum based plastics resources, the development of biomass resources has attracted extensive attention of researchers recently. The research on environmental friendly antibacterial packaging materials has increasingly become a new trend. Nanocellulose (CNC) derived from biomass has attracted particular attention. In recent years, nanocellulose has been widely used in packaging materials, medical fields, filter media and other fields. It is a good substrate, modifier and additive. Polylactic acid (PLA) is an environmentally friendly and renewable polymer, which can be widely used in the field of food packaging to replace petroleum based plastics. However, its high brittleness and poor antibacterial properties limit the application of PLA in the field of packaging. In this study, two kinds of polylactic acid/carvacrol/nanocelluluse-zinc oxide (PLA/CRV/CNC-ZnO) composite films with antibacterial effect were successfully prepared by solution casting and electrospinning. The effects of CRV and CNC-ZnO hybrid on the properties of the composite films were studied. At the same time, two kinds of composite films were applied to strawberry preservation experiment to explore their preservation effect on strawberry. The PLA/CRV20%/CNC-ZnO3% composite film prepared by solvent casting method and F-PLA/CRV20%/CNC-ZnO3% composite film prepared by electrospinning method were used to freshen strawberries in the same environment, and the fresh-keeping effect of strawberries was evaluated by sensory evaluation, weight loss rate and other tests, and the effects of packaging films prepared by different processes on the fresh-keeping effect of strawberries were compared and analyzed. The results showed that both casting film and spinning film had better preservation effect on strawberry, and the preservation effect of F-PLA/CRV20%/CNC-ZnO3% spinning film on strawberry was better than PLA/CRV20%/CNC-ZnO3% casting film, and the shelf life of strawberry was successfully extended to 10 days at 25 ℃. This study has a certain guiding role in expanding the application of PLA composite film in antibacterial food packaging.
聚乳酸 / 香芹酚 / 纳米纤维素–氧化锌 / 复合膜 / 抗菌性
Polylactic acid / carvacrol / nanocellulose zinc oxide / composite membrane / antibacterial activity
TB33
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