Abstract
Purpose
To study spatial heterogeneity in phase composition when mannitol is co-lyophilized with non-crystallizing lyoprotectant, such as sucrose or trehalose. To study the influence of formulation composition and processing conditions on the extent of mannitol hemihydrate (MHH) formation in the final lyophile.
Methods
We used synchrotron X-ray diffractometry (XRD) to spatially map and thereby comprehensively characterize mannitol phase composition in unperturbed lyophiles. Low temperature thermal analysis and XRD was used to study phase behavior of frozen systems.
Result
When colyophilized with sucrose, trehalose or lysozyme as a second solute, mannitol crystallized partially as MHH (mannitol hemihydrate). The MHH content, based on the intensity of characteristic MHH peak (d-spacing 4.92 Å), was highest in the middle region of lyophile. This heterogeneity, studied in detail in presence of sucrose, occurred irrespective of cosolute content. Annealing the frozen solution at −30°C for 2 h essentially eliminated the heterogeneity, accompanied by an overall increase in MHH content. From differential scanning calorimetry it was evident that annealing caused mannitol crystallization while XRD revealed the crystallizing phase to be MHH.
Conclusion
The intra-vial heterogeneity and total MHH content in the final lyophile is a complex interplay of formulation composition and processing conditions.
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Abbreviations
- API:
-
Active pharmaceutical ingredient
- MHH:
-
Mannitol hemihydrate
- RT:
-
Room temperature
- XRD:
-
X-ray diffractometry
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ACKNOWLEDGMENTS AND DISCLOSURES
The project was partially supported by the William and Mildred Peters endowment fund. Use of the Advanced Photon Source was supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Science, under Contract No. DE-AC02-06CH11357. We thank Dr. Wenqian Xu and Dr. Andrey Yakovenko for their help during the beamline experiments. Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program.
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Thakral, S., Koranne, S. & Suryanarayanan, R. Intra-Vial Heterogeneity in Physical Form of Mannitol in Colyophilized Binary Systems. Pharm Res 35, 214 (2018). https://doi.org/10.1007/s11095-018-2499-x
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DOI: https://doi.org/10.1007/s11095-018-2499-x