Carvacrol, citral and α-terpineol essential oil incorporated biodegradable films for functional active packaging of Pacific white shrimp

Biodegradable poly(butylene adipate terephthalate) and poly(lactic acid) (PBAT/PLA) blend films compounded with carvacrol, citral and α-terpineol essential oils (EOs) were produced for food packaging via blown-film extrusion. PBAT/PLA interacted with citral and α-terpineol via hydrogen bonding and carbonyl groups. Microstructures and barrier properties against water vapor and oxygen were modified depending on types and concentrations (3% and 6%) of EOs. Films containing 6% citral showed outstanding smoothness due to plasticization effects and improved compatibility. Addition of EOs decreased PLA crystallinity, giving increased amorphous phase for oxygen permeation. Films containing EOs inhibited quality deterioration in Pacific white shrimp including microbial growth, lipid oxidation and textural change. Citral and carvacrol effectively stabilized protein conformation in muscle tissues, leading to delayed drip loss and retained adhesion between shrimp cephalothorax and abdomen. All EO compounded films prevented melanosis. Findings indicated high potential of EO compounded films as functional active packaging to preserve seafood qualities.