Tissue imaging using nanospray desorption electrospray ionization mass spectrometry.

Tissue imaging using nanospray desorption electrospray ionization mass spectrometry.
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DOI:
10.1021/ac2021322
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发表时间:
2012-01-03
影响因子:
7.4
通讯作者:
Semmes, O. John
Semmes, O. John
中科院分区:
化学1区
文献类型:
--
作者:
Laskin, Julia;Heath, Brandi S.;Roach, Patrick J.;Cazares, Lisa;Semmes, O. John

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环境电离成像质谱法特别适合对生物样品在其自然环境中进行详细的空间分辨化学表征。然而,使用现有方法可获得的空间分辨率受到从电离区域到质谱仪的离子转移效率的限制。在这里,我们提出了使用纳喷雾解吸电离(nano-DESI)对生物样品进行环境成像的第一项研究。 Nano-DESI 是一种新的环境压力电离技术,它使用限制在两个毛细管(包括 Nano-DESI 探针和固体分析物)之间的微量溶剂来控制基质上存在的分子的解吸,然后通过自吸气纳米喷雾进行电离。我们展示了无需样品制备即可对组织样品进行高度灵敏的空间分辨分析。我们的第一个原理验证实验表明,nano-DESI 在空间分辨率优于 12 μm 的环境成像方面具有潜力。纳米 DESI 成像提供的空间分辨率的显着提高与高检测效率相结合,将使成像质谱在临床诊断、药物发现、分子生物学和生物化学中的新应用成为可能。
Ambient ionization imaging mass spectrometry is uniquely suited for detailed spatially-resolved chemical characterization of biological samples in their native environment. However, the spatial resolution attainable using existing approaches is limited by the ion transfer efficiency from the ionization region into the mass spectrometer. Here we present a first study of ambient imaging of biological samples using nanospray desorption ionization (nano-DESI). Nano-DESI is a new ambient pressure ionization technique that uses minute amounts of solvent confined between two capillaries comprising the nano-DESI probe and the solid analyte for controlled desorption of molecules present on the substrate followed by ionization through self-aspirating nanospray. We demonstrate highly sensitive spatially resolved analysis of tissue samples without sample preparation. Our first proof-of-principle experiments indicate the potential of nano-DESI for ambient imaging with a spatial resolution of better than 12 μm. The significant improvement of the spatial resolution offered by nano-DESI imaging combined with high detection efficiency will enable new imaging mass spectrometry applications in clinical diagnostics, drug discovery, molecular biology, and biochemistry.
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