Stabilization of aroma compounds through sorption-release by packaging polymers

Area of Science:

• Food Science
• Polymer Science
• Chemical Engineering

Background:

• Plastic packaging often leads to aroma loss and reduced food quality.
• Understanding aroma-polymer interactions is crucial for effective food preservation.

Purpose of the Study:

• To identify conditions where plastics regulate, rather than deplete, aroma compounds in food.
• To develop a model for predicting aroma behavior in plastic packaging systems.

Main Methods:

• A two-step mechanism involving sorption and release of aroma compounds was proposed.
• A numerical model was developed to simulate aroma degradation and sorption.
• Experimental validation was performed using the limonene/low-density polyethylene (LDPE) system.
• Simulations explored various thermodynamic and kinetic parameters for different aroma-polymer interactions.

Main Results:

• The study identified specific conditions where polymers actively regulate aroma concentration.
• Key parameters for this regulatory behavior include high partition coefficients (>10), high diffusion coefficients (>10^-9 cm2/s), and large degradation constants.
• The limonene/LDPE system in an acidic medium demonstrated rapid sorption and degradation, validating the model.

Conclusions:

• Certain plastic packaging systems can effectively regulate aroma compounds, enhancing food quality.
• The developed model provides a framework for designing packaging with controlled aroma release.
• This research offers insights into optimizing food packaging to maintain sensory attributes.