Predicting Crystallization of Amorphous Drugs with Terahertz Spectroscopy
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Predicting Crystallization of Amorphous Drugs with Terahertz Spectroscopy. / Sibik, Juraj; Löbmann, Korbinian; Rades, Thomas; Zeitler, J Axel.
In: Molecular Pharmaceutics, Vol. 12, No. 8, 03.08.2015, p. 3062-68.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Predicting Crystallization of Amorphous Drugs with Terahertz Spectroscopy
AU - Sibik, Juraj
AU - Löbmann, Korbinian
AU - Rades, Thomas
AU - Zeitler, J Axel
PY - 2015/8/3
Y1 - 2015/8/3
N2 - There is a controversy about the extent to which the primary and secondary dielectric relaxations influence the crystallization of amorphous organic compounds below the glass transition temperature. Recent studies also point to the importance of fast molecular dynamics on picosecond-to-nanosecond time scales with respect to the glass stability. In the present study we provide terahertz spectroscopy evidence on the crystallization of amorphous naproxen well below its glass transition temperature and confirm the direct role of Johari–Goldstein (JG) secondary relaxation as a facilitator of the crystallization. We determine the onset temperature Tβ above which the JG relaxation contributes to the fast molecular dynamics and analytically quantify the level of this contribution. We then show there is a strong correlation between the increase in the fast molecular dynamics and onset of crystallization in several chosen amorphous drugs. We believe that this technique has immediate applications to quantify the stability of amorphous drug materials.
AB - There is a controversy about the extent to which the primary and secondary dielectric relaxations influence the crystallization of amorphous organic compounds below the glass transition temperature. Recent studies also point to the importance of fast molecular dynamics on picosecond-to-nanosecond time scales with respect to the glass stability. In the present study we provide terahertz spectroscopy evidence on the crystallization of amorphous naproxen well below its glass transition temperature and confirm the direct role of Johari–Goldstein (JG) secondary relaxation as a facilitator of the crystallization. We determine the onset temperature Tβ above which the JG relaxation contributes to the fast molecular dynamics and analytically quantify the level of this contribution. We then show there is a strong correlation between the increase in the fast molecular dynamics and onset of crystallization in several chosen amorphous drugs. We believe that this technique has immediate applications to quantify the stability of amorphous drug materials.
U2 - 10.1021/acs.molpharmaceut.5b00330
DO - 10.1021/acs.molpharmaceut.5b00330
M3 - Journal article
C2 - 26090554
VL - 12
SP - 3062
EP - 3068
JO - Molecular Pharmaceutics
JF - Molecular Pharmaceutics
SN - 1543-8384
IS - 8
ER -
ID: 161484325