我们使用太赫兹波测量了 4 种具有不同结晶形式(文石、低镁方解石、高镁方解石、白云石)的碳酸盐矿物。我们发现,结晶的形式或形状很突出,使得可以通过太赫兹波的吸收光谱清楚地将它们区分开来,因为太赫兹频带对结晶度非常敏感。这使得鉴定碳酸盐矿物成为可能,这些矿物在全球环境评估中起着重要作用。晶体多态性评估的其他潜在用途包括药物开发和质量控制。
数据提供者:S. Sakai 博士,JAMSTEC(日本海洋地球科学技术厅)
ACS Omega 4, 2702-2707 (2019)。
在更改结晶硝苯地平与非结晶硝苯地平的比例时,我们测量了水中的悬浮液。由于太赫兹波频带对结晶度非常敏感,我们能够确认吸收峰随着晶体含量的增加而增加。硝苯地平这样的低可溶性化学物质在结晶状态下不会被吸收到水中。因此必须找到一种方法来评估它们在水中的结晶状态。进行定量评估和测定晶态和非晶态是非常重要的,因为它们是药品稳定性和溶解性的指标,并被证明对药品的开发和质量控制至关重要。
Takebe et al., J.Pharm.Sci. 102, 4065 (2013)。
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