Fractional Factorial Design of MALDI-TOF-MS sample preparations for the optimized detection of phospholipids and acylglycerols

Nagla Almasoud, Elon Correa, Drupad Trivedi, Roy Goodacre

    Research output: Contribution to journalArticlepeer-review


    Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has successfully been used for the analysis of high molecular weight compounds, such as proteins and nucleic acids. By contrast, analysis of low molecular weight compounds with this technique has been less successful due to interference from matrix peaks which have a similar mass to the target analyte(s). Recently, a variety of modified matrices and matrix additives have been used to overcome these limitations. An increased interest in lipid analysis arose from the feasibility of correlating these components with many diseases, e.g. atherosclerosis and metabolic dysfunctions. Lipids have a wide range of chemical properties making their analysis difficult with traditional methods. MALDI-TOF-MS shows excellent potential for sensitive and rapid analysis of lipids, and therefore this study focuses on computational-analytical optimization of the analysis of five lipids (4 phospholipids and 1 acylglycerol) in complex mixtures using MALDI-TOF-MS with fractional factorial design (FFD) and Pareto optimality. Five lipids were mixed at the same concentration, followed by MALDI-TOF-MS analysis in combination with chemometrics to achieve robust results and estimate ideal experimental setups. Five different experimental factors were investigated using FFD which reduced the number of experiments performed by identifying 720 key experiments from a total of 8064 possible analyses. Factors investigated included: matrices, matrix preparations, matrix additives, additive concentrations and deposition methods. This led to a significant reduction in time and cost of sample analysis with near optimal conditions. We discovered that the key factors to produce high quality spectra were the matrix and use of appropriate matrix additives. 
    Original languageEnglish
    Pages (from-to)6301–6308
    Number of pages8
    JournalAnalytical Chemistry
    Issue number12
    Publication statusPublished - 26 May 2016


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