ABSTRACT
Purpose
Temozolomide dry powder formulations for inhalation, performed with no excipient or with a lipid or lactose coating, have been evaluated.
Methods
The particle size of raw temozolomide in suspension was reduced by a high-pressure homogenizing technique, and the solvent was evaporated by spray-drying to obtain a dry powder. The physicochemical properties of this powder were evaluated and included its crystalline state, thermal properties, morphology, particle size and moisture and drug content, and these properties were determined by X-ray powder diffraction, differential scanning calorimetry, scanning electron microscopy, laser light scattering, thermogravimetric analysis and high-performance liquid chromatography, respectively. The aerodynamic properties and release profiles were also evaluated using a multistage liquid impinger and a modified USP type 2 dissolution apparatus adapted for inhaler products, respectively.
Results
The dry powder inhalation formulations had a high temozolomide content that ranged from 70% to 100% in the crystalline state and low moisture content. Aerodynamic evaluations showed high fine-particle fractions of up to 51% related to the metered dose. The dissolution profile revealed a similarly fast temozolomide release from the formulations.
Conclusions
Dry temozolomide powder formulations, based on the use of acceptable excipients for inhalation and showing good dispersion properties, represent an attractive alternative for use in local lung cancer therapy.
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Abbreviations
- DLPC:
-
1,2-dilauroyl-sn-glycero-3-phosphocholine
- DMPC:
-
1,2-dimyristoyl-sn-glycero-3-phosphocholine
- DPI:
-
dry powder inhaler
- DPPC:
-
dipalmitoyl phosphatidylcholine
- DSC:
-
differential scanning calorimetry
- FPD:
-
fine particle dose
- FPF:
-
fine particle fraction
- HPH:
-
high-pressure homogenizing
- HPLC:
-
high-performance liquid chromatography
- HPMC:
-
hypromellose
- IV:
-
intravenous
- MMAD:
-
mass median aerodynamic diameter
- MsLI:
-
multi-stage liquid impinger
- MTIC:
-
5-(3-methyltriazen-1-yl)imidazole-4-carboxamide
- NGI:
-
next generation impactor
- NSCLC:
-
non-small cell lung cancer
- P90H:
-
phospholipon 90H
- SCLC:
-
small cell lung cancer
- SEM:
-
scanning electron microscopy
- SLF:
-
simulated lung fluid
- TGA:
-
thermogravimetric analysis
- TMZ:
-
temozolomide
- XRPD:
-
X-ray powder diffraction
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ACKNOWLEDGMENTS
The authors would like to thank the Industrial Chemistry Department of ULB for the X-Ray Powder Diffraction. Robert Kiss is a Director of Research with the Fonds National de la Recherche Scientifique (FRS-FNRS, Brussels, Belgium).
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Wauthoz, N., Deleuze, P., Saumet, A. et al. Temozolomide-Based Dry Powder Formulations for Lung Tumor-Related Inhalation Treatment. Pharm Res 28, 762–775 (2011). https://doi.org/10.1007/s11095-010-0329-x
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DOI: https://doi.org/10.1007/s11095-010-0329-x