Spray congealing

Spray congealing, also known as spray cooling, is a solvent free process that transforms a melt into well defined spherical particles.

In recent years the technology has been used for controlled release formulation and also for taste masking. In the latter application it is particularly suitable for oral disintegrating tablets since it provides perfect encapsulation at particle level.

How it works

The API is dissolved (or suspended) in a melted excipient (typically a low melting point polymer) and atomized into cold nitrogen leading to solidification of the droplets and particle formation. The particles are then separated from the gas stream in a cyclone and/or a filter bag. This is a solvent-free process that makes use of spray drying assets as a means of isolating the newly formed particles.

Applications


Solid dispersions

Amorphous materials (drug + polymer) used to overcome solubility limitations of BCS class 2 and 4 drugs.

Microencapsulated particles

Crystalline drug encapsulated with a coating polymer. For example, enteric polymers can be used to protect drug from the gastric conditions or for enhanced delivery to the site of maximum absorption. Similar approaches can be used for taste masking and for for protecting the drug from physical environments (e.g. light, moisture).

Pharmaceutical cocrystals

Cocrystals are multicomponent crystals of, at least, two molecules (API+coformer) combined in a stoichiometric ratio. Cocrystals have shown efficacy on improving aqueous solubility of poorly water-soluble APIs, hygroscopicity, stability, taste, and downstream processing capacity.

Also in Technologies

Hot melt extrusion

Hot melt extrusion is a fast growing technology platform thas is utilized to solve difficult formulation challenges, primarily in the area of solubilization.

Jet milling

Jet milling is widely used in the pharmaceutical industry and remains the leading technology for particle size reduction and is most commonly used for having consistent and uniform particles during formulation.

Spray drying

Spray drying has become one of the most successful particle engineering technologies for improving drug bioavalability through the amorphous solid dispersion platform.