Sequential Sanitizing Process for Fresh Produce
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Solution Overview
Problem
Current sanitizing methods for produce, particularly leafy vegetables, are inadequate in effectively reducing bacterial contamination and extending shelf-life, as chlorine alone is not a complete kill step and other sanitizers either present additional problems or are not as effective.
Innovation Solution
A sequential treatment method using chlorine dioxide, chlorine, and peroxyacetic acid applied in various combinations and sequences to produce, which synergistically achieves a significant reduction in microbial load and eliminates pathogens like Listeria, pathogenic E. coli, and Salmonella.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorine alone is used to sanitize produce, then the sanitizing process is simple and cost-effective, but it does not provide a complete kill step and fails to eliminate pathogens effectively
Solution Approach 1:
The patent combines multiple sanitizing agents (chlorine dioxide, chlorine, and peroxyacetic acid) into a sequential treatment process. Each agent targets different aspects of microbial contamination, with chlorine dioxide providing initial reduction, chlorine delivering the primary kill step, and peroxyacetic acid eliminating residual pathogens and biofilms, achieving synergistic pathogen elimination that exceeds the sum of individual treatments
Solution Approach 2:
The sanitizing process is divided into distinct sequential stages, each employing a different sanitizing agent with specific functionality. This segmentation allows each agent to perform its optimal function without interference, creating a multi-hurdle approach where each stage contributes to overall pathogen elimination reliability
2Reliability
If multiple sanitizing agents are used sequentially, then pathogen elimination effectiveness increases significantly, but the processing time and operational complexity increase
Solution Approach 1:
Chlorine dioxide is applied first to reduce the initial microbial load and disrupt biofilm structures before the main chlorine treatment. This preliminary action prepares the produce surface by removing protective biofilm matrices and reducing overall microbial population, making the subsequent chlorine kill step more effective and potentially shorter in duration
Solution Approach 2:
The patent optimizes treatment parameters including concentration levels, exposure times, and sequence ordering of different sanitizing agents. By carefully controlling these parameters, the process achieves maximum microbial reduction while minimizing total processing time through optimized exposure durations for each agent
3Reliability
If stronger sanitizing agents are used to eliminate biofilms and pathogens, then sanitation effectiveness improves, but potential harm to produce quality and safety increases
Solution Approach 1:
Different sanitizing agents are applied in specific sequences to different aspects of contamination: chlorine dioxide targets biofilm disruption and initial microbial reduction, chlorine provides the primary kill step for pathogens, and peroxyacetic acid eliminates residual contaminants. Each agent is applied at optimized concentrations and durations to achieve maximum sanitation while minimizing impact on produce quality, with the final rinsing step removing any residual chemicals
Solution Approach 2:
The patent converts the potential harm of strong sanitizing agents by using a sequential approach where each agent's harshness is mitigated by the previous and subsequent treatments. The multi-stage process allows for thorough pathogen elimination while the controlled sequence and rinsing steps prevent excessive chemical exposure that could damage produce quality, transforming potentially harmful strong chemicals into a controlled, effective, and safe treatment
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 method provides at least a 3.5 to 4 log unit reduction in microbial load, significantly extending the shelf-life and ensuring greater sanitation than chlorine alone, while being compatible with existing commercial processing methods and safe for organic produce.
Implementation Method 1
treating the produce with a chlorine dioxide solution... treating the produce with a solution containing chlorine... treating the produce with a solution containing peroxyacetic acid
Data Source
AI summary
A method for sanitizing produce, by: treating the produce with a chlorine dioxide solution for a period of time sufficient to sanitize the produce; treating the produce with a solution containing chlorine for a period of time sufficient to further sanitize the produce; and treating the produce with a solution containing peroxyacetic acid for a period of time sufficient to further sanitize the produce, where treating with the chlorine dioxide solution, the solution containing chlorine, and the solution containing peroxyacetic acid yields at least an additional 1 log unit reduction in microbial load, as compared to produce treated with a single solution selected from the chlorine dioxide solution, the solution containing chlorine, and the solution containing peroxyacetic acid.