摘要：Highlights•Packaging film modified with PLA was prepared and fully characterized.•Modified packaging will be extend the shelf life time for food packaging.•Treatment of chicken fillet with lactic acid was compared with packaging film.•Sensory score of chicken fillet packaged in PLA were significantly higher.AbstractCoated packaging film with nano-emulsified polylactic acid (PLA) was prepared as an extended shelf life package for chicken fillet. PLA was prepared by direct polycondensation to be prepared after that nanoparticles by solvent displacement as potential coating for packaging systems. The characterizations of PLAwere done by thermo-gravimetric measurement size exclusion chromatography and differential scanning calorimetry. Additionally, the particle size distribution was measured by dynamic light scattering which exhibited narrow particle size distribution with mean particle size ≈70 nm. The effect of PLA nanoparticles coating was evaluated as an active packaging for a chicken fillet stored at 4 °C. An aerobic plate, coliforms counts (APC) and sensory score were also studied. The Low molecular weight PLA (LM-PLA) reduces APC by 1.5 log cfu/g and coliforms count by 75 MPN/g than the control and extended the storage time more than 2 days. Meanwhile, a high molecular weight PLA (HM-PLA) significantly reduces APC by 2.1 log cfu/g and coliforms count by 107 MPN/g lower than the control beside extended the storage time by more than 3 days. Although dipping in lactic acid 1% for 5 min and 2% for 10 min was increased the storage time to 11th and 15th days respectively. Moreover, the sensory score of chicken fillet packaged in PLA were significantly high.
关键词：Antimicrobial packaging;Biodegradable polymers;Polylactic acid (PLA);Bioactive packaging films;Chicken fillet shelf life
