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Use of MALDI matrices as dopant in Atmospheric Pressure Photoionisation

机译:使用MALDI矩阵作为掺杂剂的大气压光激酶

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Atmospheric Pressure Photoionization (APPI) has recently emerged as a promising ionization method that allows coupling of mass spectrometry and liquid chromatography. The technique is based on formation of a spray containing the solvent and analyte and on which UV photons from a discharge lamp are shone. Hence, the basic phenomenon in APPI is photoionization of the analyte. Due to the high UV absorption from the nebulizing gas and the solvents and due to the low concentration of the analyte, direct photoionization lacks sometimes sentivity. Usually, a third molecule (the dopant), possessing a good photoionization cross section at the lamp wavelength, is introduced in the source. Ionization of the dopant molecule generates radical cations that may either react through charge transfer or proton transfer with the analyte, if conditions on the ionization energies and proton affinities are met. Among the most used dopant molecules are acetone, toluene and anisole.
机译:最近允许大气压力 - 光相(APPI)作为允许质谱和液相色谱的偶联的有前途的电离方法。该技术基于含有溶剂和分析物的喷雾的形成,并且在该喷雾器上闪亮了来自放电灯的UV光子。因此,APPI中的基本现象是分析物的光离子化。由于从雾化气体和溶剂的高紫外线吸收,并且由于分析物的低浓度,直接的光化有时缺乏束光度。通常,在源中引入具有在灯波长的灯波长处具有良好光离子横截面的第三分子(掺杂剂)。掺杂剂分子的电离产生可自由基阳离子,如果相应电离能量和质子亲和力的条件,则可以通过对分析物通过电荷转移或质子转移反应。在最常用的掺杂剂分子中是丙酮,甲苯和苯甲醚。

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