Essential oils are volatile chemical compounds found in plants that give them their characteristic flavour and aroma. These compounds are very sensitive to temperature, light and oxygen, making their preservation a challenge.
As freeze-drying is a dehydration process that allows food to be preserved for long periods of time without altering its flavour, aroma and texture, it is the most suitable and ideal of the drying processes.
Freeze-drying is a gentle process that does not alter the molecular structure of the food, allowing essential oils to retain their organoleptic properties for long periods of time.
Freeze-drying is the best option for preserving the essential oils of herbs and spices. This process allows these ingredients to maintain their natural flavour and aroma for years, even without refrigeration, as no heat is applied in the drying process and they remain free of moisture, preventing their biological activity to a minimum during preservation.