关于澄清FDA政策的建议,用于评估通用治疗药物更高阶结构的"相似性"
Jessica A Rogers-Crovak1, Edward J Delaney1, David J Detlefsen2
1Novatia, LLC, 54 Walker Ln, Newtown, Pennsylvania, 18940, USA.
The AAPS journal
|November 25, 2024
概括
类药物样本中的微小的pH值变化可以改变NMR光谱数据,可能导致仿制药失败"相同性"测试. 建议对样品的pH值进行最小调整,以准确评估更高阶结构.
科学领域:
- 制药科学 制药科学
- 分析化学 分析化学
- 生物化学 生物化学
背景情况:
- 美国FDA的2021年指南协助仿制药制造商向创新产品展示"相似性".
- 核磁共振 (NMR) 和主要成分分析 (PCA) 是评估高阶结构的关键方法.
- 需要直接,非侵入性样本分析,限制对NMR添加氧化的修改.
研究的目的:
- 调查样本pH值变化对NMR光谱数据对类药物分析的影响.
- 为了确定观察到的光谱变化是由于更高阶结构变化或质子化状态.
- 提出一种调整样本pH值的方法,以确保准确的"相似性"评估.
主要方法:
- 使用核磁共振 (NMR) 光谱学分析类药物样本.
- 使用主要成分分析 (PCA) 来进行光谱数据的定量比较.
- 研究受控的pH值变化和氧化添加对质子共振的影响.
主要成果:
- 微小的pH值差异显著转移了质子共振,表明了氨基酸残留质子化的变化.
- 这些共振转移是可逆的,并不表明更高阶结构的改变.
- 样本队列之间的pH值变化经常导致未能达到FDA对"相同性"的定量基准.
结论:
- 样品的pH值,而不是更高阶结构,是影响类药物的NMR光谱数据的关键因素.
- 目前的分析约束可能会不公平地惩罚仿制类药物候选者.
- 建议在样品制备过程中允许轻微的,可控的pH调整,以准确评估更高阶结构和确定"性".
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