New Approach for Chemometric Analysis of Mass Spectrometry Data

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Title: New Approach for Chemometric Analysis of Mass Spectrometry Data
Authors: Marhuenda Egea, Frutos Carlos | Gonsálvez Álvarez, Rubén D. | Lledó Bosch, Belén | Ten Morro, Jorge | Bernabeu, Rafael
Research Group/s: Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES) | Biotecnología
Center, Department or Service: Universidad de Alicante. Departamento de Agroquímica y Bioquímica | Universidad de Alicante. Departamento de Biotecnología
Keywords: Chemometric analysis | Mass spectrometry data
Knowledge Area: Bioquímica y Biología Molecular | Biología Celular
Issue Date: 8-Feb-2013
Publisher: American Chemical Society
Citation: Analytical Chemistry. 2013, 85(6): 3053-3058. doi:10.1021/ac303255h
Abstract: The search of metabolites which are present in biological samples and the comparison between different samples allow the construction of certain biochemical patterns. The mass spectrometry (MS) methodology applied to the analysis of biological samples makes it possible for the identification of many metabolites. Each obtained signal (m/z) is characteristic of a particular metabolite. However, the mass data (m/z) interpretation is difficult because of the large amount of information that they contain. In this work, we present a relatively simple tool that allows us to deal with the whole of the mass information from the chemometric analysis. The statistical analysis is a key stage in order to identify the metabolites involved in a particular biochemical pattern. We transformed the mass data matrix in a vector. By having the data as a vector, it was possible to keep all the information and also avoid the signals overlapping, which is the major problem when the total ion chromatogram (TIC) is obtained. In the approach proposed here, the mass data (m/z) matrix was split in 100 different TIC in order to avoid the signal overlapping. The 100 chromatograms were concatenated in a vector. This vector, which can be plotted as a continuous (2D pseudospectrum), greatly simplifies for one to understand the subsequent dimensional multivariate analysis. To validate the method, 19 samples from two human embryos culture medium were analyzed by high-pressure liquid chromatography–mass spectrometry (HPLC–MS). Our methodology would be applied to the obtained raw data. Later on, a multivariate analysis was conducted using a robust principal components analysis interval (robPCA) and interval partial least squares algorithm (iPLS). The results obtained allow one to differentiate the two sample populations undoubtedly, although their composition was similar.
Sponsor: This work has been supported by grants from Instituto Bernabeu (Grant INSTITUTOBERNABEU1-08I) and the University of Alicante (Grant UAUSTI09-08) Project.
ISSN: 0003-2700 (Print) | 1520-6882 (Online)
DOI: 10.1021/ac303255h
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 American Chemical Society
Peer Review: si
Publisher version:
Appears in Collections:INV - GFES - Artículos de Revistas
INV - GIDBT - Artículos de Revistas

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