Definition and Characteristics of Deoxygenation Packaging Technology:
Definition of Deoxygenation Packaging Technology: Deoxygenation packaging refers to a packaging technique where a deoxygenating agent capable of chemically reacting with oxygen is enclosed in a sealed packaging container. This process removes oxygen from the packaging, creating conditions with very low or nearly zero oxygen concentration to preserve the packaged contents.
Characteristics of Deoxygenation Packaging Technology: Deoxygenation packaging is a relatively new method that emerged after the development of vacuum and gas-filled packaging. Its most significant feature, compared to vacuum and gas-filled packaging, is its ability to reduce oxygen levels to very low levels, creating an environment that is nearly oxygen-free. Deoxygenating agents not only eliminate oxygen within the packaging but also remove oxygen that may permeate from the external environment or dissolve in liquids or fill solid sponge-like structures.
Additionally, deoxygenation packaging has the following characteristics when compared to other packaging techniques:
It reduces or eliminates the need for antimicrobial and antioxidant food additives in the food production process, enhancing food safety.
It prevents oxidation damage to various foods, such as avoiding the development of off-flavors in oils and fats, preventing discoloration in animal and plant tissues (e.g., meat), minimizing flavor loss, and reducing the loss of nutritional elements.
It effectively prevents or delays decay and spoilage caused by aerobic microorganisms, thus extending the shelf life appropriately. In summary, deoxygenation packaging technology is an efficient, convenient, and safe food packaging method.
Classification and Mechanism of Deoxygenating Agents:
Classification of Deoxygenating Agents: Deoxygenating agents can be classified into two categories based on their composition:
Inorganic deoxygenating agents, primarily composed of inorganic matrices, such as iron-based deoxygenators, sulfite-based deoxygenators, and hydrogenation catalyst-type deoxygenators.
Organic deoxygenating agents, mainly composed of organic matrices, including enzymes, ascorbic acid derivatives, oleic acid, linoleic acid, or tocopherol. Among them, iron-based deoxygenators are the most widely used due to their ready availability, low cost, effective oxygen removal, and high safety.
Mechanism of Common Deoxygenating Agents:
Iron-Based Deoxygenators: Iron-based deoxygenators, mainly utilizing iron powder, operate by the principle of iron oxidation and rusting. The primary deoxygenation reactions are as follows:
Hydrogenation Catalyst-Type Deoxygenators: Deoxygenators using platinum, rhodium, palladium, etc., as hydrogenation catalysts operate by adsorbing active hydrogen in their porous state. They catalyze the reaction between hydrogen and oxygen, producing water and achieving oxygen removal.
In conclusion, deoxygenation packaging is a diverse and effective approach, with various deoxygenating agents available for specific applications. The choice of deoxygenating agent depends on factors such as the type of food, packaging conditions, and desired preservation outcomes.