Silicon dioxide Used in Pharmaceutical Industry

Silicon dioxide, also known as colloidal silica or fine silica, is widely used in the pharmaceutical industry. Its small particle size and high surface area make it ideal for improving the flowability of dry powders, such as in tablet compression. It can also be used to stabilize emulsions, as a thixotropic thickener and suspending agent in gels and semi-solid formulations.

When combined with other components with similar refractive indices, silicon dioxide can form transparent gels. The increase in viscosity depends on the polarity of the liquid, with polar solvents requiring higher concentrations of silica than non-polar solvents. Viscosity is unaffected by temperature, but changes in pH can affect it.

In non-canned aerosols, silicon dioxide is used to improve the suspension of particles and reduce nozzle blockages. It can also be used as a disintegrant in tablets, as a liquid adsorbing dispersant in powders, and to increase the viscosity of lipophilic suppositories to prevent sedimentation and lower release rate. Safe colloid silicon dioxide is widely used in oral and some topical preparations and is generally considered a non-toxic and non-irritant excipient.

In conclusion, silicon dioxide is a versatile ingredient in the pharmaceutical industry with several desirable properties, including excellent flowability, stabilizing emulsions, thixotropic properties, suspension of particles, and controlled release of drugs. All of these features contribute to the development of safe and effective drug formulations.

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