Freeze drying, or lyophilization, is a sophisticated dehydration process that takes place entirely within a freeze dryer. This process is designed to preserve perishable materials while maintaining their structure and nutritional content. Here's how the process works inside a freeze dryer, broken down into the key steps:
The food is frozen to -40℉ or lower.
After the food is frozen, the freeze dryer uses a vacuum pump to pull out the air inside its chamber. The ice in the food then changes into a misty gas. The freeze dryer takes this gas away, leaving only dry food behind.
When the freeze-dried food is ready to be consumed, just add water. It will taste, smell, and look as if it's fresh.
Once the freeze drying process is complete, the product must be promptly sealed in moisture-proof packaging to prevent reabsorption of water and maintain its quality until rehydrated. For added protection against oxidation and to prolong shelf life, it's recommended to include oxygen absorbers inside the packaging. When ready to use, the freeze-dried product is rehydrated with water, returning almost to its original state, while retaining its original structure and nutritional content.
The Harvest Right Freeze Dryer is a versatile appliance that can freeze dry a wide range of items, including candy, pharmaceuticals, homeopathic remedies, camping food, pet food, coffee, mushrooms, guacamole/salsa, herbs, fruits, veggies, meats, fish, ice cream, eggs, baby food, easy-to-make meals, soups, and cannabis products (where legal). It preserves flavors, nutrients, and textures while extending shelf life, making it a valuable tool for various purposes.