Abstract：
:This article describes a procedure to facilitate scale-up for the primary drying phase of lyophilization using a combination of empirical testing and numerical modeling. Freeze dry microscopy is used to determine the temperature at which lyophile collapse occurs. A laboratory scale freeze-dryer equipped with manometric temperature measurement is utilized to characterize the formulation-dependent mass transfer resistance of the lyophile and develop an optimized laboratory scale primary drying phase of the freeze-drying cycle. Characterization of heat transfer at both lab and pilot scales has been ascertained from data collected during a lyophilization cycle involving surrogate material. Using the empirically derived mass transfer resistance and heat transfer data, a semi-empirical computational heat and mass transfer model originally developed by Mascarenhas et al. (Mascarenhas et al., 1997, Comput Methods Appl Mech Eng 148: 105-124) is demonstrated to provide predictive primary drying data at both the laboratory and pilot scale. Excellent agreement in both the sublimation interface temperature profiles and the time for completion of primary drying is obtained between the experimental cycles and the numerical model at both the laboratory and pilot scales. Further, the computational model predicts the optimum operational settings of the pilot scale lyophilizer, thus the procedure discussed here offers the potential to both reduce the time necessary to develop commercial freeze-drying cycles by eliminating experimentation and to minimize consumption of valuable pharmacologically active materials during process development.
journal_name
J Pharm Scijournal_title
Journal of pharmaceutical sciencesauthors
Kramer T,Kremer DM,Pikal MJ,Petre WJ,Shalaev EY,Gatlin LAdoi
10.1002/jps.21430subject
Has Abstractpub_date
2009-01-01 00:00:00pages
307-18issue
1eissn
0022-3549issn
1520-6017pii
S0022-3549(16)32837-4journal_volume
98pub_type
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doi：10.1016/j.xphs.2017.11.011
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更新日期：2010-02-01 00:00:00
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