Short review on Controlled Nucleation

Freeze-drying (also known as lyophilization or cryodesiccation) is a dehydration process mainly used to preserve for perishable material and this method make the material more convenient for transport. Freezedrying works by freezing the material and then reducing the surrounding pressure and giving sufficient heat to allow the frozen water into the material to sublime directly from the solid phase to gas phase. Sublimation is the transition of a substance from the solid to the vapor state, without first passing through an intermediate liquid phase. A method to achieve controlled ice nucleation during the freeze-drying process using an ice fog, vial treatment, ultrasound, additives and electro freezing technique was demonstrated in an earlier report. And by the potential of a high electric field was utilized to induce ice nucleus formation in aqueous solutions. Using this technique it was possible to reduce the primary drying time during lyophilization. [1] Many technical issues surrounding the freeze-drying process have been addressed over the past several decades. Better understanding of critical formulation characteristics and cycle conditions. There are two types of technique for nucleation 1) Uncontrolled Nucleation, 2) Controlled Nucleation. The objectives of the present study simply introduce controlled Nucleation is the rapid ice nucleation in freeze drying technique. [2]

Author(s): Gupta Anuj

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