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.

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%.

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%.

An apparatus is provided including a sealable fluid-tight container comprising leafy organic material and a one-way fluid-tight valve, a pressure source, and means for connecting the pressure source to the sealable fluid-tight container such that the pressure source applies fluid pressure to the sealable fluid-tight container via the one-way fluid-tight valve. The pressure source is configured to provide fluid to the sealable fluid-tight container comprising the leafy organic material and the one-way fluid-tight valve keeps received fluid from escaping the sealable fluid-tight container.

A modified atmosphere packaging (MAP) lid (100) is provided. The lid includes a base (102); a sachet receiving surface (106) having a plurality of holes (110); and a raised perimeter wall (108) enclosing and defining the sachet receiving surface, wherein the sachet receiving surface lies level with or above the base. Also provided is a MAP container (150) including a MAP lid described herein, a dry chemical sachet (170) for placement on the sachet receiving surface; an adhesive patch (180) for sealing onto the raised perimeter wall to retain the dry chemical sachet on the sachet receiving surface; and a MAP carton.

A modified atmosphere packaging (MAP) lid (100) is provided. The lid includes a base (102); a sachet receiving surface (106) having a plurality of holes (110); and a raised perimeter wall (108) enclosing and defining the sachet receiving surface, wherein the sachet receiving surface lies level with or above the base. Also provided is a MAP container (150) including a MAP lid described herein, a dry chemical sachet (170) for placement on the sachet receiving surface; an adhesive patch (180) for sealing onto the raised perimeter wall to retain the dry chemical sachet on the sachet receiving surface; and a MAP carton.

Disclosed is a freshness preservation unit for a storage box of a refrigerator. At least one through hole is provided on at least one box wall of the storage box. The freshness preservation unit includes a housing wherein an accommodating space is formed. A freshness preservation film is provided in the accommodating space. The housing is provided with a fixing piece which is cooperatable with the box wall of the storage box such that the freshness preservation unit is assembled in the through hole of the storage box in a detachable manner. The freshness preservation unit realizes the functions of freshness preservation and storage for fruits and vegetables, and is assembled in the through hole of the storage box in a detachable manner, convenient to assembly and disassembly, convenient to cleaning and replacement, and low in the maintenance cost.

Disclosed is a freshness preservation unit for a storage box of a refrigerator. At least one through hole is provided on at least one box wall of the storage box. The freshness preservation unit includes a housing wherein an accommodating space is formed. A freshness preservation film is provided in the accommodating space. The housing is provided with a fixing piece which is cooperatable with the box wall of the storage box such that the freshness preservation unit is assembled in the through hole of the storage box in a detachable manner. The freshness preservation unit realizes the functions of freshness preservation and storage for fruits and vegetables, and is assembled in the through hole of the storage box in a detachable manner, convenient to assembly and disassembly, convenient to cleaning and replacement, and low in the maintenance cost.

A method is used for preserving dlmetmyoglobin enzyme in meat and poultry. The method comprises the steps of: packing a master bag containing the meat or poultry; flushing the master bag with a non-oxygen gas to reduce a residual oxygen level within the master bag to 1% or less; sealing the master bag; and storing the master bag at a temperature between 28? and 42? F. The master bag comprises: a material exhibiting gas permeability for oxygen of less than 10 mL/m.sup.2/24 hours at 23? C.; and a self-activated oxygen scavenger material in an atmosphere of greater than 70% relative humidity. An oxygen absorption rate of the self-activated oxygen scavenger material is calculated by a first order oxygen absorption using Arrhenius equation, so as to achieve a zero oxygen storage atmosphere within 24 hours after sealing, and being able to function at a temperature range between 28? and 40? F.

A method is used for preserving dlmetmyoglobin enzyme in meat and poultry. The method comprises the steps of: packing a master bag containing the meat or poultry; flushing the master bag with a non-oxygen gas to reduce a residual oxygen level within the master bag to 1% or less; sealing the master bag; and storing the master bag at a temperature between 28? and 42? F. The master bag comprises: a material exhibiting gas permeability for oxygen of less than 10 mL/m.sup.2/24 hours at 23? C.; and a self-activated oxygen scavenger material in an atmosphere of greater than 70% relative humidity. An oxygen absorption rate of the self-activated oxygen scavenger material is calculated by a first order oxygen absorption using Arrhenius equation, so as to achieve a zero oxygen storage atmosphere within 24 hours after sealing, and being able to function at a temperature range between 28? and 40? F.