Antimicrobial Packaging Films Using Lauric Arginate Ethyl Ester Coating
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Solution Overview
Problem
Existing antimicrobial packaging solutions for food, particularly fresh and minimally processed foods, face challenges such as limited effectiveness, stability issues, and high costs due to the need for polymeric carriers and complex coating processes, which can lead to rapid release or loss of antimicrobial agents, reducing their protective duration against microbial contamination.
Innovation Solution
A thermoplastic film with surfaces coated using a solution or dispersion of lauric arginate ethyl ester in a mixture of water, ethanol, and ethyl acetate, without the need for polymers, providing a stable and effective antimicrobial coating that retains activity over time, potentially combined with additional antimicrobial agents and odor absorbers like zeolite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial agents are added to the blends used for extrusion of the packaging film, then the packaging film has antimicrobial properties, but the antimicrobial agent undergoes degradation due to high temperatures during extrusion and is partially immobilized within the film matrix
Solution Approach 1:
The packaging structure is divided into separate functional layers: a base film layer and a coating layer containing the antimicrobial agent. This segmentation allows the antimicrobial agent to be isolated from high-temperature extrusion processes while still providing protective coverage on the packaging surface.
Solution Approach 2:
The antimicrobial coating is applied to the base film before the actual packaging process. This preliminary application ensures the antimicrobial agent is already in position and protected when the packaging is assembled, avoiding exposure to degradation conditions during subsequent processing steps.
2Reliability
If antimicrobial agents are added to the blends used for extrusion of the packaging film, then the packaging film has antimicrobial properties, but a high amount of active compound is necessary since the antimicrobial material is partially immobilized within the film matrix
Solution Approach 1:
The antimicrobial agent is concentrated specifically in the coating layer that directly contacts the food product, rather than being distributed throughout the entire film matrix. This localized placement ensures maximum effectiveness at the critical interface where contamination occurs, reducing the total amount of active compound needed.
3Reliability
If an antimicrobial coating is applied on the food-contact surface of the packaging film, then the packaging has antimicrobial properties, but the coating has the tendency to be lost or abraded from the surface of the film
Solution Approach 1:
The coating is formulated as a composite material combining the antimicrobial agent (lauric arginate ethyl ester) with edible polymeric carriers. This composite structure provides both the antimicrobial function and the mechanical stability needed to prevent coating loss during handling and storage, while remaining safe for food contact.
4Ease of operation
If edible polymeric carriers are used to form an antimicrobial coating, then the coating is continuous and adhesive, but the antimicrobial coating still tends to be lost or abraded from the surface of the film
Solution Approach 1:
The formulation parameters of the coating are optimized by selecting specific edible polymers with appropriate molecular weights, functional groups, and viscosities. These parameter adjustments enhance the coating's cohesive strength and adhesion to the film substrate, reducing abrasion and loss during normal use while maintaining continuity and adhesion properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a stable and durable antimicrobial coating that effectively extends the shelf life of packaged food by maintaining antimicrobial activity for an extended period, improving food safety and organoleptic properties while being cost-effective and reproducible.
Implementation Method 1
LAE has been verified to be nontoxic and is 'Generally Recognized As Safe' (GRAS) by the U.S. Food and Drug Administration. It is hydrolyzed in the human body into arginine and lauric acid, which are common substances produced by metabolism of several foods.
Data Source
AI summary
The present invention is directed to a thermoplastic packaging film coated with an antimicrobial coating, a method for the preparation of the coated film and packaging articles made with the film.