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DBDA as a Novel Matrix for the Analyses of Small Molecules and Quantification of Fatty Acids by Negative Ion MALDI-TOF MS
Journal of the American Society for Mass Spectrometry ( IF 3.2 ) Pub Date : 2018-01-18 , DOI: 10.1007/s13361-017-1881-y
Ling Ling 1 , Ying Li 1 , Sheng Wang 1 , Liming Guo 1 , Chunsheng Xiao 2 , Xuesi Chen 2 , Xinhua Guo 1, 3
Affiliation  

Matrix interference ions in low mass range has always been a concern when using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) to analyze small molecules (<500 Da). In this work, a novel matrix, N1,N4-dibenzylidenebenzene-1,4-diamine (DBDA) was synthesized for the analyses of small molecules by negative ion MALDI-TOF MS. Notably, only neat ions ([M–H]-) of fatty acids without matrix interference appeared in the mass spectra and the limit of detection (LOD) reached 0.3 fmol. DBDA also has great performance towards other small molecules such as amino acids, peptides, and nucleotide. Furthermore, with this novel matrix, the free fatty acids in serum were quantitatively analyzed based on the correlation curves with correlation coefficient of 0.99. In addition, UV-Vis experiments and molecular orbital calculations were performed to explore mechanism about DBDA used as matrix in the negative ion mode. The present work shows that the DBDA matrix is a highly sensitive matrix with few interference ions for analysis of small molecules. Meanwhile, DBDA is able to precisely quantify the fatty acids in real biological samples.

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中文翻译:

DBDA作为一种新型的小分子分析和通过负离子MALDI-TOF MS进行脂肪酸定量的基质

当使用基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF MS)分析小分子(<500 Da)时,低质量范围的基质干扰离子一直是一个令人关注的问题。在这项工作中,合成了一种新的基质N 1,N 4-二亚苄基苯-1,4-二胺(DBDA),用于通过负离子MALDI-TOF MS分析小分子。值得注意的是,只有纯离子([M–H] -质谱中出现无基质干扰的脂肪酸,检测限(LOD)达到0.3 fmol。DBDA对氨基酸,肽和核苷酸等其他小分子也有出色的表现。此外,使用该新型基质,根据相关系数为0.99的相关曲线对血清中的游离脂肪酸进行了定量分析。此外,还进行了UV-Vis实验和分子轨道计算,以探讨DBDA在负离子模式下作为基质的机理。目前的工作表明,DBDA基质是一种高度敏感的基质,几乎没有干扰离子可用于分析小分子。同时,DBDA能够精确定量真实生物样品中的脂肪酸。

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更新日期:2018-01-18
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