Tip-enhanced laser ablation sample transfer for biomolecule mass spectrometry.

Tip-enhanced laser ablation sample transfer for biomolecule mass spectrometry.
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DOI:
10.1007/s13361-014-1005-x
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发表时间:
2015-01
影响因子:
3.2
通讯作者:
Murray, Kermit K.
Murray, Kermit K.
中科院分区:
化学3区
文献类型:
--
作者:
Ghorai, Suman;Seneviratne, Chinthaka A.;Murray, Kermit K.

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原子力显微镜 (AFM) 尖端增强激光烧蚀用于将分子从薄膜转移到悬浮银线,以便使用激光解吸电离 (LDI) 和基质辅助激光解吸电离 (MALDI) 进行离线质谱分析。使用具有 30 nm 半径镀金硅尖端的 AFM 对样品进行成像,并将尖端保持在距表面 15 nm 的位置,以便使用 355 nm Nd:YAG 激光器去除材料。被烧蚀的材料被捕获在银线上,该银线与尖端垂直保持 300 μm,水平保持 100 μm。对于小分子蒽和罗丹明 6G,将线切割并使用双面导电胶带粘贴到金属靶上,并使用商用激光解吸飞行时间质谱仪通过 LDI 进行分析。从每个 1 μm 烧蚀点烧蚀大约 100 fg 的材料,并以大约 3% 的效率转移。对于较大的多肽分子血管紧张素 II 和牛胰岛素,将捕获的材料溶解在饱和基质溶液中并沉积在 MALDI 分析的靶标上。
Atomic force microscope (AFM) tip enhanced laser ablation was used to transfer molecules from thin films to a suspended silver wire for off-line mass spectrometry using laser desorption ionization (LDI) and matrix-assisted laser desorption ionization (MALDI). An AFM with a 30 nm radius gold-coated silicon tip was used to image the sample and to hold the tip 15 nm from the surface for material removal using a 355 nm Nd:YAG laser. The ablated material was captured on a silver wire that was held 300 μ m vertically and 100 μm horizontally from the tip. For the small molecules anthracene and rhodamine 6G, the wire was cut and affixed to a metal target using double-sided conductive tape and analyzed by LDI using a commercial laser desorption time-of-flight mass spectrometer. Approximately 100 fg of material was ablated from each of the 1 μ m ablation spots and transferred with approximately 3% efficiency. For larger polypeptide molecules angiotensin II and bovine insulin, the captured material was dissolved in saturated matrix solution and deposited on a target for MALDI analysis.
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