How to Preserve Walnut Kernels

The specific methods for preserving walnut kernels include low-temperature refrigeration, keeping them dry and moisture-proof, light-proof storage, airtight sealing to isolate air, and avoiding odor absorption.
1. Low-Temperature Refrigeration
Walnut kernels are rich in oil and prone to oxidation and rancidity in high-temperature environments. Place the walnut kernels in a sealed bag or airtight container, then store them in the refrigerator's crisper drawer. Control the temperature between 0-4°C, which can slow down the oxidation rate, inhibit the growth of microorganisms, and extend the shelf life.
2. Keeping Dry and Moisture-Proof
Humid environments easily cause walnut kernels to absorb moisture, which not only affects the taste but also creates conditions for mold growth. Walnut kernels should be stored in a dry and well-ventilated place. You can put desiccants (such as food-grade silica gel desiccants) in the storage container to absorb excess moisture and maintain dryness.
3. Light-Proof Storage
Light accelerates the oxidation of oil in walnut kernels, leading to the loss of nutrients and deterioration of flavor. Therefore, use opaque containers or dark packaging materials for storage to avoid direct sunlight and reduce the risk of oxidation.
4. Airtight Sealing to Isolate Air
Oxygen in the air causes walnut kernels to undergo oxidation, resulting in a rancid taste. Use containers with good airtightness or store the walnut kernels after vacuum sealing to reduce contact with air. This can effectively prevent oxidation and spoilage, and maintain the quality and taste of the walnut kernels.
5. Avoiding Odor Absorption
Walnut kernels easily absorb the odors of other foods. When storing them, keep them separate from foods with strong odors (such as garlic and onions) to prevent contamination by strange smells and avoid affecting the eating flavor.