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Development of spray-dried acetaminophen microparticles using experimental designs.
A Billon1, B Bataille, G Cassanas
1Laboratoire de Pharmacie Galénique, Pharmacotechnie et Biopharmacie, Faculté de Pharmacie, 15, Avenue Charles Flahault, 34060 Cedex 2, Montpellier, France.
International Journal of Pharmaceutics
|September 1, 2000
Summary
Optimizing spray drying conditions for pharmaceutical formulations maximized production yields above 80% and achieved low moisture content around 1%. Key factors influencing outcomes included inlet temperature and feed rate, though microparticle flowability remained a challenge.
Area of Science:
- Pharmaceutical Technology
- Chemical Engineering
- Materials Science
Background:
- Spray drying is a crucial technique for producing pharmaceutical powders.
- Optimizing process parameters is essential for achieving desired product characteristics like yield and moisture content.
- Formulation components, such as cellulose derivatives and acetaminophen, influence spray drying outcomes.
Purpose of the Study:
- To investigate the impact of five parameters on spray-dried product yield and moisture.
- To optimize operating conditions for maximizing production yields and minimizing moisture content.
- To evaluate the repeatability and reproducibility of the optimized spray-drying process.
Main Methods:
- Experimental factorial designs (fractional and central rotational composite) were employed.
- Response surface methodology was used to estimate optimal operating conditions.
- Three formulations with cellulose derivatives and acetaminophen were tested.
Main Results:
- Inlet temperature, feed rate, and their interaction were significant for sodium carboxymethylcellulose formulations.
- Feed rate and colloidal silica concentration were significant for microcrystalline cellulose formulations.
- Optimized conditions yielded >80% production yield and ~1% moisture content.
- Spray-dried microparticles exhibited poor flowability due to cohesiveness and small size (<55 microm).
Conclusions:
- The study successfully optimized spray drying parameters for enhanced yield and reduced moisture.
- Significant factors varied based on formulation composition.
- While yield and moisture were improved, microparticle characteristics like flowability require further attention.