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Soft Matrix–Assisted Laser Desorption/Ionization for Labile Glycoconjugates

  • Chuping Lee
  • Chi-Kung NiEmail author
Research Article

Abstract

Since its introduction, matrix-assisted laser desorption/ionization (MALDI) has been widely used for the mass analysis of biomolecules. The “soft ionization” of MALDI enables accurate mass determination of intact biomolecules. However, the ionization and desorption processes of MALDI are not adequately soft as many labile biomolecules, such as glycoconjugates containing sialic acid or the sulfate functional group, easily dissociate into fragments and sometimes, no intact molecules are observed. In this study, we compared the conventional matrix of MALDI, namely 2,5-dihydroxybenzoic acid, to various soft matrices of MALDI—specifically, 5-methoxysalicylic acid, diamond nanoparticle trilayers, HgTe nanostructures, ionic liquid, and droplets of frozen solutions—by using three labile glycoconjugates as analytes: gangliosides, heparin, and pullulan. We demonstrated that droplets of frozen solution are the softest matrices for gangliosides and heparin. In particular, droplets of frozen solution do not generate fragments for gangliosides and can be used to determine the relative abundance of various gangliosides, whereas ionic liquid 2,5-dihydroxybenzoic acid butylamine is the most suitable matrix for pullulan mass analysis.

Graphical Abstract

Keywords

MALDI Glycoconjugates Glycans Frozen solution Diamond nanoparticle trilayers Ionic liquid Gangliosides Heparin Pullulan 

Notes

Acknowledgements

We thank Dr. Chang, Huan-Tsung, and Dr. Chang, Hsiang-Yu for providing HgTe nanostructures. We also thank Dr. Wang, Yi Sheng, and Dr. Wang, Chia-Chen, for their help in preparing the trilayer samples. We acknowledge the support of the Ministry of Science and Technology, Taiwan (NSC 106-2113-M-001-023-MY3).

Supplementary material

13361_2019_2208_MOESM1_ESM.docx (220 kb)
ESM 1 (DOCX 220 kb)

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Copyright information

© American Society for Mass Spectrometry 2019

Authors and Affiliations

  1. 1.Institute of Atomic and Molecular Sciences, Academia SinicaTaipeiTaiwan
  2. 2.Department of ChemistryWayne State UniversityDetroitUSA
  3. 3.Department of ChemistryNational Tsing Hua UniversityHsinchuTaiwan

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