Laser desorption/ionization mass spectrometry of lipids using etched silver substrates.

Laser desorption/ionization mass spectrometry of lipids using etched silver substrates.
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使用蚀刻银基底对脂质进行激光解吸/电离质谱分析

DOI:
10.1016/j.ymeth.2016.01.014
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发表时间:
2016
期刊:
影响因子:
4.8
通讯作者:
Dreisewerd
Dreisewerd
中科院分区:
生物学3区
文献类型:
--
作者:
Schnapp;Niehoff;Dreisewerd

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银辅助激光解吸/电离质谱可用于小分子的分析。例如,与银阳离子的加合物形成使得能够对长链烃进行分子分析,而长链烃难以通过常规基质辅助激光解吸电离(MALDI)进行纯化。在这里,我们使用高度多孔的银箔,用硝酸蚀刻,作为样品基板的LDI质谱。作为分析复杂脂质混合物的模型系统,研究了果蝇(Drosophila melanogaster)和蜜蜂(Apis mellifera)的表皮提取物。通过将浸提液点样到蚀刻银基质上获得的质谱证明了对多种脂质类别(如长链饱和和不饱和烃、脂肪酰基醇、蜡酯和三酰甘油)的灵敏检测。在印迹之后,具有几十微米的横向分辨率的表皮表面的MS成像成为可能,即,在通过与基底物理接触转移脂质之后。的例子信息素生产男性后翅的斜视布什棕色蝴蝶(Bicyclus anynana)和指纹显示。由于该基材也易于生产,因此它们提供了胶体银纳米颗粒和迄今为止描述的其他银基材的可行替代物。
Silver-assisted laser desorption/ionization mass spectrometry can be used for the analysis of small molecules. For example, adduct formation with silver cations enables the molecular analysis of long-chain hydrocarbons, which are difficult to ionize via conventional matrix-assisted laser desorption ionization (MALDI). Here we used highly porous silver foils, produced by etching with nitric acid, as sample substrates for LDI mass spectrometry. As model system for the analysis of complex lipid mixtures, cuticular extracts of fruit flies (Drosophila melanogaster) and worker bees (Apis mellifera) were investigated. The mass spectra obtained by spotting extract onto the etched silver substrates demonstrate the sensitive detection of numerous lipid classes such as long-chain saturated and unsaturated hydrocarbons, fatty acyl alcohols, wax esters, and triacylglycerols. MS imaging of cuticular surfaces with a lateral resolution of a few tens of micrometers became possible after blotting, i.e., after transferring lipids by physical contact with the substrate. The examples of pheromone-producing male hindwings of the squinting bush brown butterfly (Bicyclus anynana) and a fingermark are shown. Because the substrates are also easy to produce, they provide a viable alternative to colloidal silver nanoparticles and other so far described silver substrates.
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