What is pharmaceutical spray drying?
Pharmaceutical spray dryers are designed to create fine powder substances by atomizing a mist of drug in a liquid feedstock under high temperature through a high pressure nozzle.
What is a spray dried dispersion?
A spray dried dispersion (SDD) is a single-phase, amorphous molecular dispersion of a drug in a polymer matrix. It is a solid solution with the compound molecularly “dissolved” in a solid matrix.
Where is spray drying used?
Spray-drying is often used for encapsulation. Active substances can be homogenized into emulsions or slurries prior to spray-drying and dried into functional ingredients. Encapsulation has many advantages, two of which are protection against thermal degradation and improved final product functionality.
Is spray drying a CCP?
If spray drying your products reduces bacteria levels to safe levels or kills pathogens that are present then the inlet temperature or the outlet temperature should be regarded as a CCP.
What is the difference between spray drying and freeze drying?
Product temperatures in freeze drying are generally below 0°C in primary drying and 20–30°C during secondary drying, whereas product temperatures in spray drying are regularly above 80°C. The direct impact of working with these higher temperatures can be an overall loss of: Efficacy. Taste.
Why is spray drying used?
Spray drying is a method of producing a dry powder from a liquid or slurry by rapidly drying with a hot gas. This is the preferred method of drying of many thermally-sensitive materials such as foods and pharmaceuticals, or materials which may require extremely consistent, fine, particle size.
How does spray drying work?
Spray drying involves the atomisation of a liquid feed into very small droplets within a hot drying gas leading to flash drying of the droplets into solid particles. The particles are then separated from the drying gas, using a cyclone and/or a filter bag, as a final spraydried product.
What is cyclone in spray dryer?
Cyclone separators are used in the dairy industry for • gas–solids separation, mainly for separating product fines from the air leaving spray dryers and fluidized bed dryers, both to increase yield and to minimize air pollution. This is the commonest application of cyclones.
Is spray drying safe?
The risk of adverse events is ever-present in any spray drying operation. Spray drying is a physical–chemical process in which evaporation transforms liquid into dry powder – and wherever there’s powder or dust in spray drying plants there’s a risk of explosion or even fire. This can heighten the danger of explosion.
How do you spray dry milk?
Spray drying involves atomizing the milk concentrate from the evaporator into fine droplets. This is done inside a large drying chamber in a flow of hot air (up to 200 °C) using either a spinning disk atomizer or a series of high pressure nozzles.
How the liquid gets separated in freeze dryer?
How the liquid does gets separated in freeze dryer? Explanation: The material is first frozen so that the liquid gets frozen and is separated as crystals. Explanation: Since the contact time is less the flash dryer can be used to dry heat sensitive or easily oxidizable materials.