Freeze-drying: A Revolution in Fruit Preservation
Freeze-drying, an innovative process in the field of food preservation, is increasingly used to preserve fruits while maintaining their nutritional and organoleptic qualities. Unlike traditional drying methods, freeze-drying involves a complex freezing and sublimation process, which offers significant advantages in terms of food preservation.
Principle of Freeze-drying
Freeze-drying is a multi-step process. First, the fruit is frozen at extremely low temperatures, usually around -40ºC. This freezing transforms the water present in the fruit into ice. Then, the pressure is reduced in a vacuum chamber, approximately to 0.01 mbar. Under these conditions, sublimation occurs, where the ice transforms directly into water vapor, bypassing the liquid state. This vapor is then collected in a condenser. Finally, a secondary drying step is performed to remove any residual water molecules trapped on the surface of the fruit.(1)
At the end of the process, the fruit contains only a tiny amount of water, usually between 1% and 5%, making it virtually moisture-free. This method preserves the fruit's shape, texture, flavor, and nutrients, resulting in a high-quality product and extended shelf life.
Benefits of Freeze Drying Fruits
Freeze drying has several significant advantages over traditional drying methods, including air drying or drying using food dehydrators.
First, freeze-drying allows for extended preservation of fruits while preserving their shape and volume. Unlike traditional drying, which can lead to physical and chemical changes, as well as a loss of texture, freeze-drying maintains the structural integrity of the fruits.(2)
Additionally, freeze-drying effectively preserves the nutrients in fruit. This process takes place at low temperatures, which allows up to 95% of the fruit's nutritional values to be retained. Essential vitamins and minerals are thus preserved, providing consumers with a healthy and nutritious product.(2)
Regarding organoleptic qualities, freeze-drying preserves the taste, color, smell, and texture of the fruit. Unlike traditional drying methods, which can alter these characteristics, freeze-drying preserves the sensory aspect of the fruit, making it attractive and appetizing for consumers.
Comparison with Classic Drying
The main difference between freeze-drying and conventional drying lies in the preservation quality of the fruits. While conventional drying can result in significant nutrient loss, as well as altered texture and taste, freeze-drying preserves the nutritional and organoleptic quality of the fruits.(3)
In fact, freeze-drying can preserve up to 95% of the nutritional value of fruit, while conventional drying can eliminate up to 60%. In addition, conventional drying often leaves some residual moisture, which can lead to premature deterioration of the fruit. In contrast, freeze-drying effectively removes all water, ensuring long-term preservation.(2)
In conclusion, freeze-drying is emerging as a revolutionary preservation method for fruits, offering an effective solution for preserving their freshness, nutritional value, and sensory qualities. Thanks to this innovative process, consumers can now enjoy delicious and nutritious fruits all year round, without compromising on quality.
Which Holyfat products contain freeze-dried fruit?
You can find freeze-dried fruit in most of our fruit purees, as well as in our bars.
Where do our freeze-dried fruits come from?
Our supplier is located in Europe. The fruits come from various sources (Turkish strawberries, Costa Rican pineapples, Ecuadorian bananas, etc.).
Sources:
1. Sagar Bhatta, Tatjana Stevanovic Janezic. Freeze-Drying of Plant-Based Foods. Foods, 2020 Jan; 9(1): 87
2.Xanyar Mohammadi, Yuhao Deng, Impact of Three Different Dehydration Methods on Nutritional Values and Sensory Quality of Dried Broccoli, Oranges, and Carrots. Foods, 2020 Oct; 9(10): 1464.
3. Norshahida Mohamad Shofian, Azizah Abdul Hamid. Effect of Freeze-Drying on the Antioxidant Compounds and Antioxidant Activity of Selected Tropical Fruits. Int. J. Mol. Sci. 2011, 12(7), 4678-4692