Berlin 2005 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS 3: Cluster und Aerosole
MS 3.5: Gruppenbericht
Freitag, 4. März 2005, 15:15–15:45, HU 3088
Real-time characterization of individual bioaerosol particles with bioaerosol mass spectrometry — •Matthias Frank1, James M. Birch1, Abneesh Srivastava1, Paul T. Steele1, Keith R. Coffee1, David P. Fergenson1, Herbert J. Tobias1, Maurice E. Pitesky2, Vincent J. Riot1, Sue I. Martin1, Eric E. Gard1, Carlito Lebrilla2, Gregg A. Czerwieniec2, Scott C. Russell2, and Erica L. McJimpsey2 — 1Lawrence Livermore National Laboratory, Livermore CA 94551, USA — 2University of California Davis, Davis CA 95616, USA
We are developing a single-particle bioaerosol mass spectrometry system that can rapidly analyze individual biological particles (e.g. spores or vegetative bacteria) that are sampled directly from air into a mass spectrometer. Mass spectra from both positive and negative ions created by matrix-free or matrix-assisted laser desorption and ionization are recorded simultaneously and can be analyzed and classified in real-time. Our present system is capable of discriminating, particle by particle, between bacterial spores and other biological and non-biological background materials using the mass fingerprints obtained from those particles. We will describe recent results including the comprehensive identification of critical marker peaks from spores by isotope labeling, the reduction of the shot-to-shot mass spectral variability by laser profile conditioning, and the demonstration of sub-attomole detection limits for peptide standards. We will also discuss the prospects for potential future applications in the detection of respiratory diseases.