Fresh Food Preservation Using Alkaline and Ascorbate Solutions
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Solution Overview
Problem
Existing food preservation methods for fresh produce fail to simultaneously address oxidation, browning, and microbial contamination effectively, often requiring multiple steps and chemicals that can alter the taste, texture, and appearance of the food.
Innovation Solution
A two-step process involving an alkaline solution with a pH of 10.0 or higher for antimicrobial treatment, followed by an ascorbate solution to neutralize and prevent browning, effectively extending the shelf life of fresh produce while maintaining its sensory qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a single preservation solution containing ascorbate and carbonate is applied, then antioxidative and anti-browning properties are improved, but microbial inhibition capability deteriorates
Solution Approach 1:
The preservation process is divided into two separate steps: first applying an alkaline solution (pH 10.0 or higher) for microbial inhibition, then applying an ascorbate solution for anti-browning and neutralization. This segmentation allows each solution to perform its specialized function without compromising the other, resolving the contradiction between microbial inhibition and browning prevention.
Solution Approach 2:
The alkaline solution is applied first to establish microbial inhibition before the ascorbate solution is applied for anti-browning. The preliminary alkaline treatment creates a foundation that protects the produce, and the subsequent ascorbate application builds upon this by preventing browning while neutralizing residual alkalinity.
2Reliability
If multiple preservation chemicals are applied in sequence, then comprehensive preservation coverage is improved, but process complexity deteriorates
Solution Approach 1:
The patent combines multiple preservation functions into just two solution applications: the first solution (alkaline) handles microbial inhibition, and the second solution (ascorbate) handles both anti-browning and neutralization. This merging of functions into a concise two-step process reduces complexity while maintaining comprehensive preservation coverage.
Solution Approach 2:
The ascorbate solution serves multiple functions: it prevents browning through antioxidative action, neutralizes the residual alkalinity from the first solution, and extends shelf life. This multi-functionality reduces the need for additional separate treatment steps, simplifying the overall process.
3Reliability
If strong alkaline solution is applied for microbial inhibition, then antimicrobial effectiveness is improved, but risk of tissue damage and discoloration deteriorates
Solution Approach 1:
The patent converts the potential harm of strong alkaline solution (tissue damage and discoloration) into a benefit by immediately following it with an ascorbate solution. The ascorbate neutralizes the residual alkalinity and prevents discoloration, transforming what would be a harmful side effect into a controlled and beneficial outcome.
Solution Approach 2:
The ascorbate solution is applied as a preliminary protective measure against the harmful effects of the alkaline solution. By anticipating and preventing tissue damage and discoloration before they can occur, the ascorbate treatment counteracts the potential negative effects of the strong alkaline environment.
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 achieves a significant reduction in microbial contamination by up to 3 log, prevents undesired browning, and maintains the texture, taste, and appearance of fresh produce, thereby extending its shelf life and improving its sensorial character.
Implementation Method 1
providing an aqueous solution (1), wherein the solution (1) is an alkaline solution with a pH value of from 10.0 to 13.0... applying the solution (1) on the fresh food... achieves a significant reduction in microbial contamination by up to 3 log
Implementation Method 2
providing an aqueous solution (2), comprising 0.5% to 25% w/w ascorbate and/or isoascorbate ions... applying the solution (2) on the same fresh food... prevents undesired browning
Implementation Method 3
providing an aqueous solution (2), comprising 0.5% to 25% w/w ascorbate and/or isoascorbate ions... applying the solution (2) on the same fresh food... ascorbate solution to neutralize
Data Source
AI summary
The present invention relates to a new process for preserving fresh food, in particular fresh produce, by applying an alkaline solution and subsequently an acidic solution onto the fresh food.