Size-selected (2-10 nm) gold nanoparticles for matrix assisted laser desorption ionization of peptides. Academic Article uri icon

abstract

  • In this report, first use of size-selected gold nanoparticles (AuNPs) as matrixes for matrix assisted laser desorption/ionization (MALDI) is described for peptides and proteins. In comparison with conventional organic acid MALDI matrixes, the optimum matrix-to-analyte ratio with AuNP matrixes is reduced by 10-14 orders of magnitude. Significant differences in the relative abundances of the ions observed in positive and negative mode MALDI-time-of-flight mass spectrometry (TOFMS) are revealed as the AuNP size distribution is decreased from 10 to 2 nm, whereby 2-nm AuNPs exhibit quantum confinement effects prevalent in quantum dots. AuNP matrixes allow for selective analyte ionization, as demonstrated in the selective MALDI-TOFMS of phosphotyrosine in a background of phosphoserine and phosphothreonine peptides.

author list (cited authors)

  • McLean, J. A., Stumpo, K. A., & Russell, D. H

complete list of authors

  • McLean, John A||Stumpo, Katherine A||Russell, David H

publication date

  • January 1, 2005 11:11 AM