Journal of Proteomics, Volume, 2014, 108, Pages: 369-372, DOI: 10.1016/j.jprot.2014.06.005
C. Fleith, S. Cantel, G. Subra, A. Mehdi, J. Ciccione, J. Martinez, C. Enjalbal
We report applications of new hybrid org.-inorg. silica based materials as laser desorption/ionization (LDI)-promoting surfaces for high-throughput identification of peptides. The driving force of our work was to design a new material composed of a conventional MALDI matrix covalently attached to silica with a high org./inorg. ratio in order to improve the UV absorption by such LDI hybrid matrixes. Amorphous CHCA-functionalized silica presenting an org. content up to 1.3 mmol g-1 (around 40% in wt. from TGA and elementary anal. measurements) gave very interesting LDI performances in terms of detection sensitivity as well as relative ionization discrepancy (spectral suppression) through the analyses of small synthetic peptide mixts. (550-1300 Da) taking CHCA and amorphous silica as model matrixes for control expts.