Traditional fruit preservation is highly dependent on the cold chain and chemical preservatives (such as antibacterial agents and growth regulators).The active fresh-keeping fruit box with the function of gas regulation (MA) spontaneously regulates the gas composition in the package through physical means (mainly to reduce O₂ and increase CO₂ concentration), creating a microenvironment that inhibits breathing and delays aging, and provides a potential technical path for reducing the dependence on chemical preservatives.Active gas regulation is usually achieved in two ways: first, the use of the fruit's own respiration, combined with the specific permeability of the packaging film (different transmittance for O₂ and CO₂), after sealing, naturally achieve a dynamically balanced gas ratio, which is called “passive air conditioning.”The second is to add gas adsorbents (such as oxygen absorbers, carbon dioxide generators) or sustained-release agents to the package to actively and quickly establish and maintain the ideal gas atmosphere, that is, “active air conditioning”.

This kind of active fresh-keeping box has significant value for extending the shelf life.For example, the use of air-conditioned packaging with high carbon dioxide concentration for strawberries can effectively inhibit mold growth and fruit softening; the treatment of cherries with low oxygen and high carbon dioxide can maintain the greenness of the stem and the hardness of the fruit.Compared with simple refrigeration, air-conditioned packaging can further extend the shelf life by 30% to 100%, which is of great significance for expanding the sales radius, responding to market fluctuations, and reducing waste.In terms of reducing the dependence on chemical preservatives, air conditioning preservation is a physical method that does not involve the direct addition of chemical substances. It is more in line with consumers' preferences for clean labels and natural products, and can enhance the market attractiveness and premium ability of products.

However, the realization of its potential value requires rigorous technical control.The tolerance window of different fruit varieties to gas concentration varies greatly. Too low oxygen may cause an odor in anaerobic breathing, and too high carbon dioxide may cause physiological damage.Therefore, the breathability parameters of the packaging material must accurately match the breathing rate of the fruit.At the same time, air conditioning packaging usually requires stricter temperature control, because temperature fluctuations can drastically change the breathing rate and destroy the gas balance.When evaluating applications, enterprises need to cooperate with professional packaging technology providers to conduct a large number of experiments on specific fruits, determine the best gas formula, packaging materials and storage temperature, and establish a corresponding quality control system.Although the technical complexity and cost are higher than ordinary packaging, for fruit products that are high-value, easy to lose, or committed to creating a high-end and healthy brand image, the active fresh-keeping air conditioning box represents a very promising direction of fresh-keeping technology development.