Quantification and molecular imaging of fatty acid isomers from complex biological samples by mass spectrometry
作者:Hua Zhang、Meng Xu、Xudong Shi、Yuan Liu、Zihui Li、Justin C. Jagodinsky、Min Ma、Nathan V. Welham、Zachary S. Morris、Lingjun Li
DOI:10.1039/d1sc01614h
日期:——
fatty acids (FAs) in biological samples is essential to comprehend their biological functions in various physiological and pathological processes. Herein, we report a novel approach of using peracetic acid (PAA) induced epoxidation coupled with mass spectrometry (MS) for localization of the CC bond in unsaturated FAs, which enables both quantification and spatial visualization of FA isomers from biological
阐明生物样品中游离脂肪酸(FA)的异构结构对于理解其在各种生理和病理过程中的生物学功能至关重要。在此,我们报告了一种使用过乙酸(PAA)诱导环氧化结合质谱(MS)定位C的新方法 不饱和 FA 中的 C 键,可实现生物样品中 FA 异构体的定量和空间可视化。丰富的诊断碎片离子指示 C C 位置是在由游离 FA 的溶液内或组织上 PAA 环氧化衍生的 FA 环氧化物断裂时产生的。通过分析人类细胞系中的 FA 以及使用 MALDI-TOF/TOF-MS 绘制癌症组织样本中的 FA 异构体图谱来评估所提出方法的性能。新开发方法的优点包括灵敏度高、简单、反应效率高以及能够对组织样本中的 FA 异构体进行空间表征。
Oxygenation of Monoenoic Fatty Acids by CYP175A1, an Orphan Cytochrome P450 from <i>Thermus thermophilus</i> HB27
monooxygenation of the monoenoic fattyacids depending on the ethylenic double bond (C═C) configuration. When the double bond was in cis-configuration, an epoxy fattyacid was found to be the major product and two allyl-hydroxy fattyacids were found to be the minor products. But when the double bond was in trans-configuration the product distribution was reversed. The oxygenation efficiency was found to be
characterization and quantitation of unsaturated FAs by massspectrometry remain an analytical challenge. Here, we report the coupling of epoxidation reaction of the C═C in unsaturated FAs and tandemmassspectrometry (MS) for rapid and accurate identification and quantitation of C═C isomers of FAs in a shotgun lipidomics approach. Epoxidation of the C═C leads to the production of an epoxide which, upon
Heat insulating foamed material and method for manufacturing the same
申请人:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
公开号:EP0679681A1
公开(公告)日:1995-11-02
A heat insulating foamed material is manufactured by concurrently mixing and blowing a polyurethane material, thereby to form a polyurethane resin composition comprising a multiplicity of closed cells containing at least one volatile compound having a boiling point of 150°C or lower and a molecular weight of 70 or larger, and a blowing agent; and fixing the reactive blowing agent in said closed cells thereby to obtain a foamed material whose closed cells are substantially filled with a vapor of said volatile compound at a vapor pressure of 1 mmHg or higher at 25°C.