Regio- and stereoselective oxidation of linoleic acid bound to serum albumin: identification by ESI–mass spectrometry and NMR of the oxidation products
作者:Claire Dufour、Michèle Loonis
DOI:10.1016/j.chemphyslip.2005.08.003
日期:2005.12
outlining common fragmentation pathways for 9- and 13-regioisomers. Chemical synthesis of 9-(E,Z)-, 9-(E,E)-, 13-(Z,E)- and 13-(E,E)-KODE helped to their structural characterization by 1H NMR. Lipid peroxidation in the presence of albumin proved to be regioselective with a larger accumulation of 13-HPODE and 9-KODE isomers. Thermodynamically more stable E,E-stereoisomers were also favored by albumin
开发了一种有效的RP-HPLC方法,用于检测由AAPH引发的与人血清白蛋白结合的亚油酸过氧化引起的氧化产物。通过二极管阵列紫外检测,可以在234 nm处定量出四种区域异构的氢过氧十八碳二烯酸(HPODE)和四种羟基十八碳二烯酸(HODE),而在280 nm处可以检测到四种氧代十八碳二烯酸异构体(KODE)。通过负ESI-质谱分析概述了9-和13-区域异构体的常见裂解途径,可以完全鉴定出不同的未衍生化的HODE,HPODE和KODE异构体。9-(E,Z)-,9-(E,E)-,13-(Z,E)-和13-(E,E)-KODE的化学合成有助于通过1 H NMR表征其结构。在白蛋白的存在下,脂质过氧化被证明具有区域选择性,并且具有13-HPODE和9-KODE异构体的大量积累。热力学上更稳定的E,E-立体异构体也被白蛋白用于HPODE和KODE。