Determination of estredox, a compound with sustained estradiol function, and its impurity profile by HPLC
作者:Patthy、Seres、Toth-Sarudy、Hazai、Pallagi、Simay, Antal、Bodor
DOI:10.1691/ph.2008.7321
日期:——
The HPLC methods described here for the assay and purity test of Estredox (E2CDS), a molecule with a redox-based, brain-targeted chemical delivery system for estradiol, allow reliable conclusions to be made on the potency and purity of API and E2CDS/HPCD complex samples. Extensive work was done to isolate and characterize the major, potential contaminants, and ensure the required stability of solutions of E2CDS, an inherently labile compound by design. Both the sample solvent and the eluent were thoroughly tested to avoid unwanted changes in sample solutions during analyses. The 12 minute isocratic assay method at 220 or 360 nm is simple, well-founded, highly precise and accurate. Purity profiling of E2CDS raised several problems in detection, stability and accuracy, owing to the fact that the pattern of the UV spectra and the stability of the compound and those of the potential contaminants often differed greatly. As a result of meticulous analysis of the UV spectra and the factors influencing the behaviour, in solution, of the compounds concerned, the 20 minute gradient method developed for the purity test, at 220 nm, of E2CDS and E2CDS/HPCD complex samples has proved to be a reliable means of adequately resolving 15–20 peaks of known and unknown compounds, and establishing the purity of various E2CDS samples. Sample impurity can be expressed as area % at 220nm, and/or as approximate w/w % (if needed), since the relative response factors, at 220 nm, of the 6 major, potential contaminants have also been determined.
这里描述的 HPLC 方法用于 Estredox (E2CDS) 的测定和纯度测试,E2CDS 是一种具有基于氧化还原的脑靶向雌二醇化学输送系统的分子,可以对 API 和 E2CDS/ 的效力和纯度得出可靠的结论。 HPCD 复杂样品。我们进行了大量工作来分离和表征主要的潜在污染物,并确保 E2CDS(一种本质上不稳定的化合物)溶液所需的稳定性。样品溶剂和洗脱液都经过彻底测试,以避免分析过程中样品溶液发生不必要的变化。 220 或 360 nm 的 12 分钟等度测定方法简单、有依据、高度精确和准确。 E2CDS 的纯度分析在检测、稳定性和准确性方面提出了一些问题,因为紫外光谱的模式以及化合物和潜在污染物的稳定性通常差异很大。通过对 UV 光谱和影响相关化合物在溶液中行为的因素进行仔细分析,为 E2CDS 和 E2CDS/HPCD 复合样品的纯度测试开发的 20 分钟梯度方法(在 220 nm 处)已证明成为充分分离已知和未知化合物的 15-20 个峰并确定各种 E2CDS 样品纯度的可靠方法。样品杂质可以表示为 220 nm 处的面积百分比和/或近似 w/w %(如果需要),因为 6 种主要潜在污染物在 220 nm 处的相对响应因子也已确定。