title: Analysis of megadalton ions using cryodetection MALDI time-of-flight mass spectrometry.
abstract: Presented are initial results from the first commercially available matrix-assisted laser desorption/ionization time-of-flight mass spectrometer specifically designed for the sensitive detection of very high mass ions (macromizer, Comet AG). This new instrument utilizes a 16-element superconducting tunnel junction detector coupled with a fully adjustable gimbal-mounted ion source/focusing region that allows unparalleled sensitivity for detection of singly charged high molecular weight ions. Using this new technology, the singly charged ions in the megadalton region are detected from immunoglobulin M and von Willebrand factor proteins. This detector technology also measures the kinetic energy of the particles impacting the detector, which can be correlated to the charge of the particles. Immunoglobulin G and streptavidin were used to demonstrate the ability of the macromizer instrument to detect high-mass ions and to discern the charge state of the ions.
authors: Department of Chemistry, ETH Hönggerberg, CH-8093 Zürich, Switzerland, and Comet AG, CH-3175 Flamatt, Switzerland.
authors: Ryan J
authors: RJ
authors: Wenzel
authors: Urs
authors: U
authors: Matter
authors: Lothar
authors: L
authors: Schultheis
authors: Renato
authors: R
authors: Zenobi