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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

  • Ling Ling
  • Ying Li
  • Sheng Wang
  • Liming Guo
  • Chunsheng Xiao
  • Xuesi Chen
  • Xinhua Guo
Research Article

Abstract

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.

Graphical Abstract

Keywords

MALDI-TOF MS Matrix Small molecules Fatty acids Quantification Negative ion mode 

Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (51273080, 21675060, and 51203153) and International Collaboration Program of Jilin province (20160414010GH).

Supplementary material

13361_2017_1881_MOESM1_ESM.doc (10.5 mb)
ESM 1 (DOC 10772 kb)

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Copyright information

© American Society for Mass Spectrometry 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Supramolecular Structure and Materials, College of ChemistryJilin UniversityChangchunChina
  2. 2.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina
  3. 3.Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education, College of Life ScienceJilin UniversityChangchunChina

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