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Sodium‐tolerant matrix for matrix‐assisted laser desorption/ionization mass spectrometry and post‐source decay of oligonucleotides
Author(s) -
Lavanant Hélène,
Lange Catherine
Publication year - 2002
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.816
Subject(s) - chemistry , mass spectrometry , analytical chemistry (journal) , reflectron , matrix assisted laser desorption/ionization , mass spectrum , matrix (chemical analysis) , desorption , analyte , adduct , ionization , ion , chromatography , time of flight mass spectrometry , organic chemistry , adsorption
A mixture of 2′,4′,6′‐trihydroxyacetophenone in acetonitrile and aqueous triammonium citrate solution in a 1:1 molar proportion (0.2 M concentration) was found to be a good matrix for the detection of synthetic oligodeoxynucleotide samples. A high proportion of volatile solvent as well as the high salt content ensure fast co‐crystallization of the matrix, co‐matrix and analyte molecules. Matrix‐assisted laser desorption/ionization (MALDI) mass spectra obtained in negative ion reflectron mode from samples prepared with this protocol show deprotonated molecules [M − H] − , rather than sodium adducts, as the most abundant ions even when up to 50 mM of sodium chloride is present in the sample. The matrix is shown to be effective for low mass modified single nucleotides as well as for longer oligodeoxynucleotides (up to 18mer). Post‐source decay (PSD) mass spectra can also be obtained by increasing the laser fluence. Simple sequence information such as the identity and localization of a deleted base or the 5′/3′ orientation can then easily be obtained. The calibration method and mass accuracy required are discussed depending on the type of information required. Copyright © 2002 John Wiley & Sons, Ltd.