Characterization of solid dispersions of itraconazole and hydroxypropylmethylcellulose prepared by melt extrusion—part I

Solid dispersions containing different ratios of itraconazole and hydroxypropylmethylcellulose (HPMC) were prepared by solvent casting. Based on dose, differential scanning calorimetry and dissolution results, a drug/polymer ratio of 40/60 w/w was selected in order to prepare dispersions by melt ext...

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Bibliographic Details
Published in:International journal of pharmaceutics 2003-01, Vol.251 (1), p.165-174
Main Authors: Verreck, Geert, Six, Karel, Van den Mooter, Guy, Baert, Lieven, Peeters, Jef, Brewster, Marcus E.
Format: Article
Language:English
Subjects:
Biological and medical sciences
General pharmacology
Hypromellose Derivatives
Itraconazole
Itraconazole - analysis
Itraconazole - chemistry
Itraconazole - pharmacokinetics
Medical sciences
Melt extrusion
Methylcellulose - analogs & derivatives
Methylcellulose - analysis
Methylcellulose - chemistry
Methylcellulose - pharmacokinetics
Pharmaceutical technology. Pharmaceutical industry
Pharmacology. Drug treatments
Solid dispersion
Technology, Pharmaceutical - methods
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Summary:Solid dispersions containing different ratios of itraconazole and hydroxypropylmethylcellulose (HPMC) were prepared by solvent casting. Based on dose, differential scanning calorimetry and dissolution results, a drug/polymer ratio of 40/60 w/w was selected in order to prepare dispersions by melt extrusion. The melt extrusion process was characterized using a design of experiments (DOE) approach. All parameter settings resulted in the formation of an amorphous solid dispersion whereby HPMC 2910 5 mPa s prevents re-crystallization of the drug during cooling. Dissolution measurements demonstrated that a significantly increased dissolution rate was obtained with the amorphous solid dispersion compared to the physical mixture. The outcome of DOE further indicated that melt extrusion is very robust with regard to the itraconazole/HPMC melt extrudate characteristics. Stability studies demonstrated that the itraconazole/HPMC 40/60 w/w milled melt extrudate formulation is chemically and physically stable for periods in excess of 6 months as indicated by the absence of degradation products or re-crystallization of the drug.
ISSN:0378-5173
1873-3476
DOI:10.1016/S0378-5173(02)00591-4