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Cyclone selection influences protein damage during drying in a mini spray-dryer
Jürgen Bögelein1, Geoffrey Lee
1Division of Pharmaceutics, Friedrich-Alexander-University, Cauerstr 4, 91058 Erlangen, Germany.
International Journal of Pharmaceutics
|October 5, 2010
Summary
A small cyclone separator in spray-drying lysozyme significantly increases protein inactivation. This is likely due to the enhanced retention of fine particles, which experience greater protein damage during the drying process.
Area of Science:
- Biochemistry
- Chemical Engineering
- Materials Science
Background:
- Spray drying is a common method for protein preservation.
- Lysozyme is a model protein used in various biochemical studies.
- Cyclone separators are crucial for particle collection in spray drying.
Purpose of the Study:
- To investigate the effect of cyclone dimension on protein inactivation during spray drying.
- To determine the influence of fine particle retention on protein damage.
Main Methods:
- Spray drying of aqueous lysozyme solution using a mini spray dryer.
- Comparison of a small-dimensioned cyclone separator with a standard cyclone.
- Analysis of protein inactivation at various drying-air outlet temperatures (50°C–105°C).
Main Results:
- The small-dimensioned cyclone consistently produced higher protein inactivation across all tested temperatures.
- Higher retention of fine particles in the small cyclone was observed.
- Fine particles, with their greater specific surface area, exhibited increased protein damage.
Conclusions:
- The use of a small-dimensioned cyclone separator enhances protein inactivation during spray drying.
- Fine particle retention within the cyclone is a key factor contributing to increased protein damage.
- Further investigation is needed to understand the irregular residual moisture profiles observed.
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