Your applications Freeze-drying

Lyophilisation is a technical process for removing water by means of sublimation drying. This is achieved through a freezing phase and a drying phase of the product, whereby the water is removed from the product via sublimation drying. By removing water, the structural properties of the product are retained, resulting in longer shelf lives and improved stability.</p

If a solution of an amorphous substance is present, it changes into a glassy state. Stabilisation of the starting products in the freezing phase is achieved by so-called cryoprotectors.
The cryoprotectors stabilise the starting product by increasing viscosity or prefentional exclusion. The latter means that the protein is kept in its native form by adding certain substances such as polyols or carbohydrates.
A vacuum is then applied for sublimation drying, which sublimates the ice and removes the water from the frozen solution.

The lyophilisation process consists of several steps. First, the product is filled into containers or vessels in liquid form. It is then quickly frozen, often using refrigerants such as liquid nitrogen or R729. Once the product is frozen, the pressure in the freeze dryer is reduced and the water in the product is removed by sublimation. The water passes directly from the solid phase to the gaseous phase. This process step is known as primary drying. This process can take several hours or even days, depending on the size and type of product. In the subsequent secondary drying process, the temperature in the product is increased in order to remove any residual water. What remains is the dissolved substance as a porous cake with a large surface area, which can later be easily dissolved in water again. In the final step, the dried product is sealed to keep moisture out of the environment.</p

As explained above, lyophilisation is used in various industries, including the food and pharmaceutical industries.

Freeze drying offers several advantages over conventional drying processes such as hot air drying. By freezing the goods, the structural properties are preserved, resulting in better rehydration. Lyophilisation also makes many food and pharmaceutical products lighter and more compact, which facilitates logistics and storage. In addition, the taste and nutritional composition is preserved, as no high temperatures are used that could lead to losses or changes.
Lyophilisation is a complex process that requires careful planning and monitoring. Selecting the appropriate freezing and drying agents and controlling the temperature and pressure are crucial to achieving a high-quality end product. In addition, the right packaging materials must be used to protect the dried product from humidity and other environmental influences.</p

Another important aspect of lyophilisation is the validation of the process. This involves carrying out tests to ensure that the product has the required characteristics and meets the requirements. The tests include determining the residual moisture, particle size and stability of the product.</p

Freeze drying is also used in R&D to develop new products and formulations. By combining lyophilisation with other techniques such as microencapsulation, innovative products with improved properties can be manufactured.

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Overall, lyophilisation is an important process used in various industries to extend the shelf life of products and improve their stability. By removing water, the structural characteristics of the product are preserved, resulting in better quality. The controlled environment and careful planning are crucial to achieving ideal results.

Lyophilisation has a long history and was first developed in the 1940s. Initially, the process was mainly used to preserve blood and serums in medical research. However, it was quickly realised that lyophilisation could also be beneficial for other food and pharmaceutical products, and so lyophilisation began to gain traction in various industries.

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In the early years of lyophilisation, applications were mainly focused on medical and military fields. Freeze-drying enabled the long-term storage of medicines, blood plasma and vaccines, which was particularly important in military supplies. It also enabled the production of blood products in powder form, which could be rehydrated if required.</p

In recent decades, significant advances have been made in lyophilisation technology. Equipment and machinery have been improved to make the process more efficient and controllable. New refrigerants and vacuum systems have been developed to speed up sublimation and shorten drying times. In addition, there are increased efforts in the formulation of products to further improve stability and rehydration properties.

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Lyophilisation could find further areas of application in the future. For example, work is underway to develop lyophilisation techniques for the manufacture of personal care products such as creams and lotions. Lyophilisation could also be used in nanotechnology to produce nanostructured materials. With advancing technology and research, the possibilities for freeze-drying are endless.</p

Overall, lyophilisation offers an effective method for preserving and stabilising products in various industries. With advances in technology and ongoing research, lyophilisation will continue to play an important role and offer new opportunities for product development.