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Partial Dehydration of Levothyroxine Sodium Pentahydrate in a Drug Product Environment: Structural Insights into Stability.
Molecular Pharmaceutics ( IF 4.5 ) Pub Date : 2020-09-22 , DOI: 10.1021/acs.molpharmaceut.0c00661
Navpreet Kaur 1 , Victor G Young 2 , Yongchao Su 3 , Raj Suryanarayanan 1
Affiliation  

Levothyroxine sodium pentahydrate (LSP; C15H10I4NNaO4·5H2O) gradually loses one molecule of water of crystallization as the water vapor pressure is decreased from 90% to 15% RH (40 °C), a behavior characteristic of nonstoichiometric hydrates. LSP loses four molecules of water of crystallization to form levothyroxine sodium monohydrate (LSM; C15H10I4NNaO4·H2O) under realistic storage conditions (40 °C/0% RH for 3 h). The crystal structure of LSP was determined following which the specimen was partially dehydrated in situ to form LSM. The crystal structure of LSM provided insight into its potential for high reactivity. Thus, its presence in a drug product is undesirable. In LSP–oxalic acid mixtures stored in a hermetic container at 40 °C, there was moisture transfer from drug to excipient. Synchrotron X-ray diffractometry revealed dehydration of LSP resulting in LSM, while anhydrous oxalic acid transformed to its dihydrate. In formulations of LSP, chemical degradation of levothyroxine sodium may be preceded by its partial dehydration.

中文翻译:

药品环境中左旋甲状腺素五水合物钠的部分脱水:稳定性的结构洞察。

左旋甲状腺素钠五水合物 (LSP; C 15 H 10 I 4 NNaO 4 ·5H 2 O) 随着水蒸气压从 90% 降低到 15% RH (40 °C),逐渐失去一分子结晶水,这是一种行为特征非化学计量的水合物。LSP在实际储存条件下(40 °C/0% RH,3 小时)失去四分子结晶水,形成左旋甲状腺素钠一水合物(LSM;C 15 H 10 I 4 NNaO 4 ·H 2 O)。LSP的晶体结构确定后,样品部分原位脱水形成 LSM。LSM 的晶体结构提供了对其高反应性潜力的深入了解。因此,它在药品中的存在是不可取的。在 40 °C 下储存在密封容器中的 LSP-草酸混合物中,水分从药物转移到赋形剂。同步加速器 X 射线衍射显示 LSP 脱水导致 LSM,而无水草酸转化为其二水合物。在 LSP 制剂中,左旋甲状腺素钠的化学降解可能先于其部分脱水。
更新日期:2020-10-05
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