A refrigerator comprises a refrigerator body, an air-conditioning membrane assembly and an air pump assembly. The refrigerator body defines a storage space and a compressor chamber therein, a storage container is arranged in the storage space, and a freshness-keeping space is defined inside the storage container. The air-conditioning membrane assembly is configured to allow more oxygen than nitrogen in airflow in a surrounding space of the air-conditioning membrane assembly to pass through the air-conditioning membrane and enter an oxygen-rich gas collection chamber. An inlet end of the air pump is communicated with the oxygen-rich gas collection chamber in a controlled manner via a pipeline and a pipeline switching mechanism, for pumping gas in the oxygen-rich gas collection chamber to the outside of the freshness-keeping space, such that the actual content of oxygen in the freshness-keeping space is in a range of 2% to 19%.

The present disclosure describes methods and systems for packaging meat products, which may be organic, in low-oxygen preservation bags configured to extend the shelf-life of the meat. Packaging methods may involve placing a plurality of pre-proportioned organic meat products on a substrate and wrapping a film around the meat and substrate. The wrapped meat products may then be positioned in a bag containing ambient air. The ambient air may be purged from the bag using a first vacuum cycle, which may be followed by a second vacuum cycle. The method can also involve flushing the bag with a gas mixture after and/or between the vacuum cycles. The gas mixture may be comprised of nitrogen and/or carbon dioxide, but not carbon monoxide. The vacuumed, gas-flushed bags may then be sealed.

The current invention covers an improved meat-packaging procedure and machine for packaging meat cuts for long-term storage at temperatures of between 28 and 42 F. The process includes sealing meat cuts or full poultry birds or bird pieces within a master bag containing (i) oxygen scavenger materials capable of reducing the residual oxygen content of the atmosphere within the bag to 0 ppm within 96 hours of sealing, and (ii) a CO2 generator capable to generate CO2 in the amount of at least 100 mL per pound of meat or poultry within 7 days of sealing. Gas is injected into the master bag to form a CO2-rich storage environment of at least 50% CO2. Depending upon the gas-volume and oxygen scavengers design in the master-bag to maintain diffusion, the CO2 generators may not be needed in the master-bag. The over-wrap of the meat or poultry trays, if meat or poultry are packed in trays, can be perforated so that gas exchange occurs within the master bag between the interior and exterior of the meat tray to absorb the residual oxygen inside the meat trays. For meat trays containing meat with poor color stability, oxygen scavengers are preferably placed within the meat trays. For cuts with good color stability, the oxygen scavengers may be placed outside the meat trays. Meat can be stored by this system for up to 10 weeks and up to twelve days of retail display life. Poultry can be stored for 28+ days by this system. Poultry can be treated with PAA or without PAA and can either be air-chilled or water-chilled with or without PAA: in both instances substantial shelf-life extension is obtained. PAA treated poultry tend to show high microbial growth when compared with non-PAA treated poultry.

The current invention covers an improved meat-packaging procedure and machine for packaging meat cuts for long-term storage at temperatures of between 28 and 42 F. The process includes sealing meat cuts or full poultry birds or bird pieces within a master bag containing (i) oxygen scavenger materials capable of reducing the residual oxygen content of the atmosphere within the bag to 0 ppm within 96 hours of sealing, and (ii) a CO2 generator capable to generate CO2 in the amount of at least 100 mL per pound of meat or poultry within 7 days of sealing. Gas is injected into the master bag to form a CO2-rich storage environment of at least 50% CO2. Depending upon the gas-volume and oxygen scavengers design in the master-bag to maintain diffusion, the CO2 generators may not be needed in the master-bag. The over-wrap of the meat or poultry trays, if meat or poultry are packed in trays, can be perforated so that gas exchange occurs within the master bag between the interior and exterior of the meat tray to absorb the residual oxygen inside the meat trays. For meat trays containing meat with poor color stability, oxygen scavengers are preferably placed within the meat trays. For cuts with good color stability, the oxygen scavengers may be placed outside the meat trays. Meat can be stored by this system for up to 10 weeks and up to twelve days of retail display life. Poultry can be stored for 28+ days by this system. Poultry can be treated with PAA or without PAA and can either be air-chilled or water-chilled with or without PAA: in both instances substantial shelf-life extension is obtained. PAA treated poultry tend to show high microbial growth when compared with non-PAA treated poultry.

The present invention relates to Zero-OxTech process and method for preserving natural enzymes with the protein muscle, and its application for increasing the shelf-life of retail-ready meat & poultry cuts. This invention explicitly proves that the oxygen absorption is a FIRST-ORDER chemical reaction, and henceforth, an absolute zero-oxygen atmosphere is possible. This absolute zero-oxygen atmosphere prevents the natural enzymes within the protein muscle, which assists in the long-term shelf-life extension of proteins. The Zero-OxTech process, its components, and its application for proteins' enzymes preservation is described in detail in this invention and has application for domestic and inter-continental trade of proteins while retaining the natural protein enzymes.

The present invention relates to Zero-OxTech process and method for preserving natural enzymes with the protein muscle, and its application for increasing the shelf-life of retail-ready meat & poultry cuts. This invention explicitly proves that the oxygen absorption is a FIRST-ORDER chemical reaction, and henceforth, an absolute zero-oxygen atmosphere is possible. This absolute zero-oxygen atmosphere prevents the natural enzymes within the protein muscle, which assists in the long-term shelf-life extension of proteins. The Zero-OxTech process, its components, and its application for proteins' enzymes preservation is described in detail in this invention and has application for domestic and inter-continental trade of proteins while retaining the natural protein enzymes.

The disclosure discloses a processing and fresh-preserving method for a high-quality fresh noodle, and belongs to the field of flour product processing industry. The processing and fresh-preserving method provided by the disclosure prepares a fresh noodle by using a technology of adding more water, greatly reduces an initial bacterial content in the fresh noodle with the utilization of 33-40% of slightly acidic electrolytic water and in combination with a high-temperature and high-humidity dehydrating technology, guarantees that a product has a good textural property, and can effectively prolong a shelf life of the fresh noodle by preserving at a low temperature of 4-10 C. and make the preservation for 2-3 months at 4-10 C.

The invention discloses a food container for preserving freshness of food, comprising a container body having a cavity adapted for containing food items; a lid detachably secured on the container body to close the cavity of the container; and one or more food preserving elements capable of absorbing food spoiling gas to preserve freshness of the food items. The one or more food preserving elements are disposed inside the cavity and/or into a material of the food container to preserve the food items for an extended period of time and remove odors.

The invention discloses a food container for preserving freshness of food, comprising a container body having a cavity adapted for containing food items; a lid detachably secured on the container body to close the cavity of the container; and one or more food preserving elements capable of absorbing food spoiling gas to preserve freshness of the food items. The one or more food preserving elements are disposed inside the cavity and/or into a material of the food container to preserve the food items for an extended period of time and remove odors.

An oxygen scavenging formulation comprising an oxidizable polymer resin, a transition metal catalyst, and a photosensitizer selected from one or more carotenoids is provided. The oxygen scavenging formulation does not need an additional triggering agent, or heating or light irradiation to trigger an oxygen scavenging function. A method of reducing oxygen atmosphere in a packaging article is also provided.