Dynamic Oxygen Control for Fruit Preservation
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Solution Overview
Problem
Current controlled atmosphere systems for food preservation, particularly for fruits like apples, face challenges in maintaining optimal oxygen levels to prevent respiratory processes that lead to energy reserve depletion and oxidation, which can result in spoilage and diseases such as scald and vitrescence.
Innovation Solution
A method that dynamically controls the oxygen levels by establishing stress inducer peaks and setpoints to limit the respiratory process while avoiding excessive fermentation, using ethanol as a stress marker and dioxygen as the stress inducer, maintaining a low fermentation state to prolong preservation without impacting organoleptic qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen levels are maintained at 21% (normal atmosphere), then respiratory processes occur leading to energy reserve consumption, but this results in short-term combustion of carbohydrates and spoilage
Solution Approach 1:
The system dynamically adjusts oxygen levels by creating periodic peaks and maintaining setpoints rather than using a constant low oxygen level. This dynamic approach allows the system to respond to the metabolic state of the produce, alternating between respiratory inhibition (during peaks) and metabolic recovery (during setpoints), thereby reducing overall energy consumption while maintaining preservation.
Solution Approach 2:
The invention implements periodic oxygen peaks superimposed on a baseline setpoint. These periodic fluctuations in oxygen concentration create cycles of metabolic stress and recovery, preventing continuous respiratory consumption of energy reserves while avoiding sustained fermentation conditions. This periodic action optimizes the balance between preservation and quality maintenance.
2Reliability
If oxygen levels are completely suppressed, then respiratory process is stopped, but this causes metabolic inversion to fermentary process which is unfavorable to conservation
Solution Approach 1:
The system applies partial oxygen suppression rather than complete elimination. By maintaining a baseline oxygen setpoint (e.g., 2-5%) and superimposing periodic peaks, the system achieves sufficient respiratory inhibition for preservation while preventing the complete metabolic inversion to fermentation. The partial oxygen presence maintains aerobic metabolism without allowing uncontrolled respiration.
Solution Approach 2:
The invention changes the oxygen parameter dynamically through periodic peaks and setpoints rather than maintaining a static low oxygen level. This parameter modulation allows the system to shift between conditions that inhibit respiration (during peaks) and conditions that support aerobic metabolism (during setpoints), preventing harmful fermentation while achieving preservation.
3Reliability
If controlled atmosphere systems maintain oxygen at 5%, then respiratory process is reduced, but this requires continuous oxygen injection and CO2 purification which increases system complexity
Solution Approach 1:
Instead of continuous atmosphere control, the system uses periodic oxygen peaks combined with a baseline setpoint. This periodic approach reduces the need for continuous active intervention, allowing the system to leverage natural metabolic cycles while achieving preservation goals with simpler control requirements compared to continuous 5% oxygen maintenance.
Solution Approach 2:
The periodic peak and setpoint system allows the produce's own metabolic processes to play a role in atmosphere regulation. During setpoints, aerobic metabolism consumes oxygen naturally; during peaks, oxygen is replenished. This self-service approach reduces reliance on complex continuous purification and injection systems.
4Reliability
If low oxygen levels are maintained continuously, then energy reserve consumption is limited, but this impacts organoleptic properties of fruits after storage
Solution Approach 1:
The periodic oxygen peaks provide intermittent periods of enhanced oxygen availability that allow metabolic recovery and maintenance of organoleptic properties. These peaks occur at intervals that prevent quality degradation while the baseline setpoint maintains preservation, creating a rhythm that protects both shelf life and sensory quality.
Solution Approach 2:
The periodic peaks serve as preliminary recovery actions before quality degradation occurs. By providing intermittent oxygen enrichment, the system proactively maintains metabolic functions and quality attributes before they deteriorate, rather than attempting to correct problems after they arise during continuous low oxygen storage.
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 approach effectively extends the preservation of fruits by reducing energy reserve consumption, preventing spoilage, and maintaining quality by managing stress markers and oxygen levels, ensuring longer storage without adverse effects on taste or quality.
Implementation Method 1
follow a quantity of stress marker in or around at least one of the foodstuffs over time, establishing in the enclosure, a stress inducer peak, said stress inducer being correlated with said stress marker such that the peak induces an increase in the amount of stress marker
Implementation Method 2
the maintenance of a normal atmosphere with 21% of oxygen leads to a short-term combustion of the energy reserves of the plant, namely carbohydrates, by respiratory processes of the fruits
Data Source
AI summary
The invention relates to a process for controlling the atmospheres of foodstuffs, in particular plant foodstuffs (1), in a chamber (2), wherein the process comprises steps of - preferably, monitoring an amount of a fermentation stress marker in or around at least one of the foodstuffs (1) over time, - (b, c, d) establishing, in the chamber, a stress inducer peak (P1), said stress inducer being correlated to said stress marker such that the peak (P1) induces an increase in the amount of stress marker, and - (e) establishing, in the chamber, a stress inducer setpoint (C(O2)) limiting the decrease in the amount of stress marker, the setpoint (C(O2)) being below, in particular above, said peak. The invention also relates to an automated device and system for atmosphere control.