The ozonation of cholesterol: separation and identification of 2,4-dinitrophenulhydrazine derivatization products of 3β-hydroxy-5-oxo-5,6-secocholestan-6-al
作者:Keyang Wang、Eliezer Bermúdez、William A. Pryor
DOI:10.1016/0039-128x(93)90023-g
日期:1993.5
The ozonation products of cholesterol, which are of interest as possible biomarkers of O3 exposure, were studied by derivatization with 2,4-dinitrophenylhydrazine (DNPH). The DNPH derivatization of 3 beta-hydroxy-5-oxo-5,6-secocholestan-6-al (2) produces the expected trans (3b) and cis (3c) derivatives of 3 beta-hydroxy-5-oxo-5,6-secocholestan-6-al, and the unexpected DNPH derivative of 3,5-dihydr
通过用 2,4-二硝基苯肼 (DNPH) 衍生化,研究了胆固醇的臭氧化产物,它是 O3 暴露的可能生物标志物。3 beta-hydroxy-5-oxo-5,6-secocholestan-6-al (2) 的 DNPH 衍生产生预期的 3 beta-hydroxy-5-oxo-5 的反式 (3b) 和顺式 (3c) 衍生物, 6-secocholestan-6-al,以及意想不到的 3,5-dihydroxy-B-norcholestane-6-carboxaldehyde 的 DNPH 衍生物 (3a)。3a、3b和3c的结构通过1H核磁共振(NMR)、13C NMR、DEPT、COSY和HC相关二维NMR技术进行鉴定,并与已知化合物的光谱进行比较。提出了一种涉及烯胺官能团的可能机制来形成 3a。3a/(3b + 3c) 的比例取决于所用酸的浓度和反应时间。