Abstract
Bioactive packaging contains natural antimicrobial agents, which inhibit the growth of microorganisms and increase the food shelf life. Solvent casting method was used to prepare the Poly (lactide)-Poly (butylene adipate-co-terephthalate) (PLA-PBAT) film incorporated with the thyme oil and clove oil in various concentrations (1 wt%, 5 wt% and 10 wt%). The clove oil composite films depicted less green and more yellow as compared to thyme oil composite films. Clove oil composite film has shown an 80% increase in the UV blocking efficiency. The tensile strength (TS) of thyme oil and clove oil composite film decreases from 1.35 MPs (control film) to 0.96 MPa and 0.79, respectively. A complete killing of S. aureus that is a reduction from 6.5 log CFU/mL to 0 log CFU/mL was observed on the 10 wt% clove oil incorporated composite film. Clove oil and thyme oil composite film had inhibited E. coli biofilm by 93.43% and 82.30%, respectively. Clove oil composite film had exhibited UV blocking properties, strong antimicrobial activity and has high potential to be used as an active food packaging.
Highlights
Active packaging is a novel method used to prolong the shelf-life of perishable foods, maintain or improve the quality and safety of prepared foods due to its interaction with the product
Active packaging for consumable goods has the potential to reduce the addition of active compounds into foods, reduction in the movement of particles from film to food and localisation activities could introduce the pathogenic microorganism into the product [1]
The results showed that thyme essential oil/β-cyclodextrin ε-polylysine nanoparticles (TCPNs) incorporated into gelatin nanofibers significantly improved the antimicrobial properties against bacteria such as
Summary
Active packaging is a novel method used to prolong the shelf-life of perishable foods, maintain or improve the quality and safety of prepared foods due to its interaction with the product. Biodegradable polymer incorporated with an active compound could ensure the food safety, quality and monitor environmental health [3]. Depending on the types of additives incorporated into the film, active packaging can be categorised into chemoactive and bioactive. Chemoactive packaging has an impact on the chemical composition of the food product and gaseous atmosphere inside a pack. It includes ethylene scavengers, modified atmosphere packaging, and moisture control systems. Bioactive packaging contains antioxidant and antimicrobial agents within the package that interact with biological molecules and may inhibit the growth of various microorganisms [3] A study by Azadbakht et al [4] used Eucalyptus globulus essential oil in chitosan to examine the antimicrobial activity in the packaging of sliced sausages. Films are usually thin sheets that are made beforehand and can be used as covers, wrappers, layer separation or packaging for various foods
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