On-plate desalting and SALDI-MS analysis of peptides with hydrophobic silicate nanofilms on a gold substrate.

ABSTRACT: We report the use of silicate nanofilms for on-plate desalting and subsequently direct laser desorption/ionization-mass spectrometric (LDI-MS) analysis of peptides. A hydrophobic octadecyltrichlorosilane (OTS) monolayer is formed on a calcinated nanofilm on a gold substrate to facilitate sample deposition and interaction with the surface that allows effective removal of MS-incompatible contaminants such as salts and surfactants by simple on-plate washing while the peptides are retained on the spot. By elimination of interferences from matrix-related ions and contaminants, sensitivity of MS analysis has been enhanced over ca. 20 times, leading to improved detection of peptides at the low-femtomolar level. A high recovery rate of the peptides is obtained by using relatively rough nanofilms,

SUBMITTER: Duan J 

PROVIDER: S-EPMC3022020 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature