Introducing Nafion for In Situ Desalting and Biofluid Profiling in Spray Mass Spectrometry.

Introducing Nafion for In Situ Desalting and Biofluid Profiling in Spray Mass Spectrometry.
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DOI:
10.3389/fchem.2021.807244
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发表时间:
2021
影响因子:
5.5
通讯作者:
Zare RN
Zare RN
中科院分区:
化学3区
文献类型:
--
作者:
Song X;Mofidfar M;Zare RN

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我们将Nafion引入喷雾质谱法的环境电离技术,用于生物流体的现场脱盐和直接分析。将Nafion作为阳离子交换材料涂覆在三角形喷咀表面。由于来自Nafion膜的磺酸基有效地将其携带的质子与无机盐离子(例如Na+和K+)交换,因此通过减少离子抑制可以显著提高分析物的电离效率。脱盐效率可达90%,对绝对盐量的最大容忍度可达100 μmol。通过去除小分子药物和代谢物中的多种内合离子类型([M + Na]+和[M + K]+),或将蛋白质形成的带电离子([M + nNa]n+和[M + nK]n+)进行倍增,也可以简化质谱曲线。因此,Nafion涂层减少了从喷雾质谱法收集的用于目标分析物定性分析或定量测量的模糊数据解释。
We introduce Nafion into the ambient ionization technique of spray mass spectrometry to serve for in situ desalting and direct analysis of biological fluids. Nafion was coated onto the surface of the triangular spray tip as the cation exchange material. Because the sulfonic group from the Nafion membrane effectively exchanges their carried protons with inorganic salt ions (e.g., Na+ and K+), the analyte’s ionization efficiency can be significantly enhanced by reducing ion suppression. The desalting efficiency can reach 90% and the maximum tolerance of the absolute salt amount reaches 100 μmol. The mass spectral profile can also be simplified by removing the multiple adducted ion types from small-molecule drugs and metabolites ([M + Na]+ and [M + K]+), or multiply charged ions formed by proteins ([M + nNa]n+ and [M + nK]n+). Thus, the Nafion coating makes less ambiguous data interpretation collected from spray mass spectrometry for qualitative profiling or quantitative measurement of a target analyte.
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