Yu J, Chudinov A, Li L, Liu J, Gao W, Huang Z, Zhou Z, Nikiforov S, Kozlovskiy V. Improvement of m/z accuracy for linear matrix-assisted laser desorption/ionization time-of-flight mass spectrometer.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020;
34:e8701. [PMID:
31845394 DOI:
10.1002/rcm.8701]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 11/09/2019] [Accepted: 12/13/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE
Linear matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) is widely used in analytical and biomedical applications. The use of delayed extraction increases the resolution, but the roughness of the matrix crystals and the misalignment of the target plate in the order of a few micrometers cause a substantial spread in the ion TOF values and a decrease in mass accuracy.
METHODS
The method of mass spectra correction based on the correlation of matrix fragment peaks in MALDI mass spectra was used. Experiments were performed using the MALDI-TOF instrument CMI-1600. SIMION 8.1 and MATLAB were used for ion motion simulations. Data analysis was done using the home-built custom-developed software and MATLAB.
RESULTS
It was shown that the peak position drift in the MALDI-TOF mass spectra depends linearly on the TOF in a wide mass range. While using the linear correction of the TOF scale, an increase in m/z accuracy of more than 10 times was achieved. The mass accuracy was limited by the resolution of the fast Analog-to-Digital Converter (ADC) used.
CONCLUSIONS
It is expected that the proposed method will significantly increase the dynamic range, since it becomes possible to sum up corrected individual mass spectra without a significant loss of resolution. Timescale adjusting can be used for both linear TOF instruments and reflector systems of various configurations.
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