How do freeze dryers/lyophilizers preserve fruits?
Freeze dryers, also known as lyophilizers, preserve fruits through a process called **lyophilization**, which removes moisture from the fruit while retaining its nutrients, flavor, and structure. Here's how it works: 1. **Freezing**: The fruit is first frozen at a very low temperature, turning the water content inside into ice. 2. **Vacuum**: Once frozen, the fruit is placed in a vacuum chamber. Under low pressure, the ice turns directly from solid to gas (a process called sublimation) without passing through the liquid phase. 3. **Moisture Removal**: As the ice sublimates, it leaves the fruit dry while maintaining its original shape and most of its nutrients. This ensures the fruit remains lightweight and shelf-stable for long periods. 4. **Sealing**: The dried fruit is then sealed in airtight packaging to protect it from moisture and air, preventing spoilage. This method preserves the fruit’s natural taste, color, and nutritional content while extending its shelf life withou...
