NDLI: The Effect of Excipients on the Molecular Mobility of Lyophilized Formulations, as Measured by Glass Transition Temperature and NMR Relaxation-Based Critical Mobility Temperature

Content Provider	Springer Nature Link
Author	Yoshioka, Sumie Aso, Yukio Kojima, Shigeo
Copyright Year	1999
Abstract	Purpose. The dependence of the molecular mobility of lyophilized formulations on pharmaceutical polymer excipients was studied. Molecular mobility as determined by NMR relaxation-based critical temperature of molecular mobility (T$_{mc}$) and glass transition temperature (T$_{g}$) is discussed in relation to the plasticizing effect of water in formulations. Methods. The T$_{mc}$ and T$_{g}$ of lyophilized γ-globulin formulations containing 6 different polymer excipients such as dextran, polyvinylpyrrolidone (PVP) and methylcellulose (MC) was determined by NMR and DSC. The molecular mobility of water in the formulations was determined by proton NMR and dielectric relaxation spectrometry (DRS). Results. T$_{mc}$ varied with polymer excipients. T$_{mc}$ increased as the ratio of bound water to mobile water increased and as the molecular mobility of mobile water decreased. The formulation containing MC exhibited a lower T$_{mc}$ than the formulation containing dextran because of the smaller ratio of bound water and the higher molecular mobility of mobile water. The T$_{mc}$ of the formulation containing PVP was higher than that expected from the higher T$_{2}$ values of water because of the lower molecular mobility of mobile water regardless of the higher ratio of mobile water. The T$_{mc}$ of these lyophilized formulations was higher than their T$_{g}$ by 23°C to 34°C, indicating that the formulations became a NMR-detected microscopically liquidized state below their T$_{g}$. Conclusions. The quantity and the molecular mobility of mobile water in lyophilized formulations can be considered to affect the T$_{mc}$ of lyophilized formulations, which in turn governs their stability.
Starting Page	135
Ending Page	140
Page Count	6
File Format	PDF
ISSN	07248741
Journal	Pharmaceutical Research
Volume Number	16
Issue Number	1
e-ISSN	1573904X
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1999-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pharmacology/Toxicology Pharmacy Biochemistry Medical Law Biomedical Engineering
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Pharmacology Molecular Medicine Pharmacology (medical) Biotechnology Pharmaceutical Science

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