Performic Acid Sterilization for Polymer Packaging
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Solution Overview
Problem
Current sterilization and disinfection methods for food, pharmaceutical, and medical packaging using hydrogen peroxide require high temperatures, which can deform polymeric materials and are energy-intensive, and struggle to achieve the required residue limits efficiently, especially at high processing speeds on automated lines.
Innovation Solution
Contacting spores with an aqueous solution containing performic acid at temperatures below 35°C for short durations, such as 15 seconds or less, achieving a significant log reduction in spore viability without the need for heat activation, and using a mixture of formic acid and hydrogen peroxide in an aerosolized form to enhance microbial inactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen peroxide sterilization is performed at high temperatures (120-135°C), then microbial inactivation is achieved, but polymeric packaging materials deform and energy consumption increases
Solution Approach 1:
The patent changes the temperature parameter from high (120-135°C) to low (≤35°C) and introduces performic acid as a new chemical agent to achieve the same microbial inactivation effect without the harmful thermal effects on polymeric materials
Solution Approach 2:
The patent replaces the thermal activation mechanism with a chemical activation mechanism, where performic acid generates hydroxyl radicals through chemical decomposition rather than thermal energy, thereby eliminating the need for high temperature treatment
2Reliability
If hydrogen peroxide sterilization is performed at high temperatures, then sterilization efficacy is improved, but energy consumption increases
Solution Approach 1:
The patent changes the temperature parameter from high (120-135°C) to low (≤35°C) and introduces performic acid as a new chemical agent to achieve the same microbial inactivation effect without the harmful thermal effects on polymeric materials
Solution Approach 2:
The patent replaces the thermal activation mechanism with a chemical activation mechanism, where performic acid generates hydroxyl radicals through chemical decomposition rather than thermal energy, thereby eliminating the need for high temperature treatment
3Reliability
If extended contact time with disinfectant is used (15 seconds), then microbial inactivation is improved, but processing line speed and productivity are reduced
Solution Approach 1:
The patent introduces performic acid which achieves complete microbial inactivation in ≤15 seconds at room temperature, dramatically reducing the required contact time compared to conventional hydrogen peroxide methods while maintaining sterilization efficacy
Solution Approach 2:
The patent employs aerosolized delivery of performic acid solution to achieve rapid, uniform distribution and immediate action on microbial surfaces, enabling complete inactivation within the shortened contact time window required for high-speed processing
4Reliability
If hydrogen peroxide is used for sterilization, then microbial inactivation is achieved, but chemical residuals are difficult to remove to meet FDA limits
Solution Approach 1:
The patent introduces performic acid as a new chemical agent that decomposes more completely than hydrogen peroxide, and uses lower operating temperatures to prevent polymer absorption of residuals, thereby achieving easier compliance with FDA residue limits
Solution Approach 2:
The patent extracts the active sterilizing component (hydroxyl radicals) through chemical decomposition of performic acid, which then decomposes further into water and carbon dioxide, effectively removing the chemical agent from the system and leaving minimal residuals
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
This method effectively reduces spore populations by at least 4 to 6 log cycles at room temperature or below, minimizing material deformation and energy consumption, while allowing for rapid processing on high-speed automated lines and efficient removal of chemical residuals.
Implementation Method 1
contacting the spores with an aqueous solution containing performic acid... the contacting effects at least a 4 log reduction in a number of spores capable of reproduction, metabolism, and/or growth
Implementation Method 2
using a mixture of formic acid and hydrogen peroxide in an aerosolized form to enhance microbial inactivation
Data Source
AI summary
Methods for killing spores include contacting the spores with an aqueous solution containing performic acid. The contacting occurs at a temperature of less than or equal to about 35° C. for a period of time of less than or equal to about 15 seconds, and the contacting effects at least a 4 log reduction in a number of spores capable of reproduction, metabolism, and/or growth.