Preserving Mooncake Freshness with Oxygen Absorbers

Preserving Mooncake Freshness with Oxygen Absorbers
Published On:August 7, 2018 Revised On:July 1, 2023

Mooncakes, a beloved delicacy enjoyed during traditional Chinese festivals like the Mid-Autumn Festival, are known for their exquisite flavours and rich symbolism. These round pastries have been savoured with a sweet or savoury filling for centuries. However, preserving the freshness and quality of mooncakes can be challenging, especially if they are intended for long-term storage.

Oxygen absorbers or oxygen scavengers can help maintain mooncake freshness, ensuring they can be enjoyed at their best even after an extended period. In this article, we explore the role of oxygen absorbers in extending the shelf life and enhancing the flavour of mooncakes.

Importance of Freshness of Mooncakes

Mooncakes are often gifted and exchanged as a token of goodwill and celebration. Their freshness ensures a delightful experience for both the giver and the recipient. Freshly baked mooncakes are characterized by their soft texture, aromatic fillings, and harmonious flavours. However, as time passes, exposure to air can cause moisture loss, oxidation, and staleness, compromising these delectable treats’ overall taste and texture.

Role of Oxygen in Food Spoilage

Oxygen is essential for various biochemical processes but also catalyzes food spoilage. When exposed to air, mooncakes undergo a process called oxidative rancidity, resulting in flavour deterioration, changes in texture, and the development of off-putting odours.

Oxygen facilitates the growth of aerobic microorganisms, further accelerating the spoilage process. Thus, controlling the presence of oxygen is crucial for preserving the quality and extending the shelf life of mooncakes.

Introducing Oxygen Absorbers

Oxygen Absorber

Oxygen absorbers are small packets designed to reduce oxygen levels in a sealed environment. They consist of a mixture of iron powder, salt, and a natural clay binder, which initiates the absorption process when exposed to oxygen.

Oxygen-absorbing sachets are designed to activate upon exposure to oxygen. When the packet is exposed to oxygen, the iron powder within the absorber reacts with the available oxygen, initiating the absorption process.

The iron powder oxidizes during this reaction and transforms into iron oxide (rust). As the oxygen is adsorbed, it is converted into a solid form, eliminating its presence within the packaging. This process occurs gradually, ensuring a controlled reduction of oxygen levels and minimizing the risk of sudden changes in atmospheric conditions.

Benefits of Using Oxygen Scavengers

Using oxygen absorbers offers several advantages for preserving mooncakes. By reducing the oxygen content, the oxygen eliminators inhibit the growth of microorganisms, mould, and other spoilage-causing agents. This extends the shelf life of mooncakes, ensuring they remain fresh and enjoyable for a longer period.

Oxygen exposure can negatively affect the taste and aroma of mooncakes, resulting in an unpleasant, stale flavour. However, oxygen absorbers prevent oxidation, maintaining the original taste and aroma of the mooncakes, even months after baking.

Mooncakes possess a delicate texture, and exposure to air can cause them to become dry and crumbly due to moisture loss. Fortunately, oxygen absorbers minimize moisture migration, helping retain the desired texture and keeping the mooncakes moist and enjoyable.

Oxygen-induced oxidation can lead to discolouration and the formation of unappetizing spots on mooncakes. Using the oxygen-absorbing sachets prevents these visual defects, allowing mooncakes to retain their attractive appearance.

How to use Oxygen Absorbers with Mooncakes

Creating an airtight and oxygen-resistant environment is essential to ensure the freshness and taste of these delicate treats. We will explore the steps to prepare the packaging.

  1. Prepare the Packaging: Ensure that the packaging is airtight and moisture-resistant. Vacuum-sealed bags or containers are ideal for this purpose.
  2. Insert oxygen scavengers: Place the required oxygen absorbers (depending on the packaging size) alongside the mooncakes. Be cautious not to directly touch the absorbers with the mooncakes, as they may alter the flavour or texture.
  3. Seal the Packaging: Seal the packaging tightly, making sure there are no gaps or leaks that could allow air to enter.

Other Applications of Oxygen Scavengers

Oxygen absorbers are beneficial for preserving the freshness and quality of mooncakes and find utility in various other applications. Here are a few examples where the use of oxygen absorbers proves advantageous:

  1. Food Storage: Oxygen-absorbing sachets are widely employed in storing various food products. Whether it’s grains, nuts, dried fruits, or dehydrated meals, oxygen absorbers help protect food items’ taste, texture, and nutritional value by preventing spoilage, rancidity, and insect infestation.
  2. Pharmaceuticals and Medical Supplies: Many pharmaceutical products, such as medications and diagnostic kits, can be negatively affected by exposure to oxygen. Oxygen scavengers assist in preserving the potency and stability of these sensitive medical supplies, ensuring their efficacy and reliability.
  3. Pet Food and Treats: Like human food, pet food can also lose its freshness and nutritional value due to exposure to oxygen. Oxygen absorbers aid in maintaining the quality and prolonging the shelf life of pet food, ensuring our furry companions receive the nourishment they need.
  4. Electronic Devices: Electronics and sensitive electronic components are prone to oxidation and corrosion caused by oxygen exposure. By placing oxygen scavengers in the packaging of electronic devices, the risk of damage and deterioration can be significantly reduced, increasing their lifespan.
  5. Collectables and Artifacts: Oxygen absorbers play a crucial role in preserving the condition and longevity of collectables, artefacts, and archival materials. They help prevent the degradation of valuable items caused by oxidation, moisture, and mould or mildew growth.
  6. Seeds and Garden Supplies: Gardeners and horticulturists can benefit from using oxygen absorbers for seed storage. By reducing the oxygen levels, these absorbers help maintain seed viability and prevent spoilage, ensuring higher germination rates and successful plant growth.

It is important to note that the appropriate type and size of oxygen absorbers should be chosen based on the specific application and the volume of the enclosed space. By leveraging the versatility and effectiveness of oxygen absorbers in these applications, extend the shelf life, enhance the quality and preserve products.


The art of mooncake making and sharing traditions have been passed down through generations, and preserving their freshness adds an extra layer of enjoyment to these treasured delicacies. Oxygen absorbers have helped how we store mooncakes, significantly extending their shelf life while maintaining their flavour, texture, and visual appeal.

By excluding oxygen, these packaging packets preserve the exquisite flavour of mooncakes, allowing us to relish their delectable taste for an extended duration beyond their initial preparation. As we anticipate the arrival of the forthcoming festival season, let us bear in mind the efficacy and marvel of oxygen absorbers and ensure that our mooncakes remain in their utmost state of perfection.