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Anal Chim Acta. 2009 Aug 26;648(2):207-14. doi: 10.1016/j.aca.2009.06.064. Epub 2009 Jul 5.

Analysis of MALDI FT-ICR mass spectrometry data: a time series approach.

Author information

1
Children's Oncology Group, Arcadia, CA 91006, USA. don.barkauskas@curesearch.org

Abstract

Matrix-assisted laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry is a technique for high mass-resolution analysis of substances that is rapidly gaining popularity as an analytic tool. Extracting signal from the background noise, however, poses significant challenges. In this article, we model the noise part of a spectrum as an autoregressive, moving average (ARMA) time series with innovations given by a generalized gamma distribution with varying scale parameter but constant shape parameter and exponent. This enables us to classify peaks found in actual spectra as either noise or signal using a reasonable criterion that outperforms a standard threshold criterion.

PMID:
19646586
PMCID:
PMC2772212
DOI:
10.1016/j.aca.2009.06.064
[Indexed for MEDLINE]
Free PMC Article
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