Detection of Biomolecules on Surfaces Using Ion-Beam-Induced Desorption and Multiphoton Resonance Ionization

D. M. Hrubowchak, M. H. Ervin, M. C. Wood, Nicholas Winograd

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Multiphoton resonance Ionization (MPRI) has been combined with Ion-beam-induced desorption to examine a set of thermally labile biological molecules present on surfaces. Specifically, we have examined films of adenine and β-estradiol, molecules with a rigid skeletal backbone. In both of these cases, molecular Ions could be produced efficiently without cooling the neutral molecules Into their ground vibrational state. We have also studied other more fragile molecules such as tryptamine, tryptophan, phenylalanine, and serotonin. The base peak In the mass spectra of these molecules Is fragment Ions formed by losses of the amine side chains. Even with this fragmentation, however, It Is possible to achieve sensitivity limits that are many orders of magnitude greater than for secondary Ion mass spectrometry, without preparing the samples in special matrices. For serotonin, detection limits of 40 fmol on the surface of a silicon target are achievable. The results also yield a linear relation between the serotonin base fragment ion intensity and the known surface concentration.

Original languageEnglish (US)
Pages (from-to)1947-1953
Number of pages7
JournalAnalytical Chemistry
Volume63
Issue number18
DOIs
StatePublished - Sep 1 1991

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Fingerprint Dive into the research topics of 'Detection of Biomolecules on Surfaces Using Ion-Beam-Induced Desorption and Multiphoton Resonance Ionization'. Together they form a unique fingerprint.

Cite this