Abstract
In this chapter we outline the state-of-the-art of extraction and fractionation techniques for proteomic analysis of food proteins and peptides. The relevance of food sample preparation in the whole proteome analysis is to ensure an unbiased reliable map that gives accurate representation of all proteins and peptides present in the food, reducing the limitations associated with the broad protein concentration range present in a specific sample. The use of these techniques should not affect the final outcome of protein and peptide separation and their subsequent analysis. Classical and novel extraction and fractionation techniques for food proteins and peptides prior to their analysis by mass spectrometry are presented separately. Appropriate methods for proteome analysis such as cell disruption, protein solubilization, removal of interfering compounds, and protein enrichment methods are discussed. Finally, a brief overview is given on protein digestion, describing the typical enzymes and the most common processes used in this key step of proteomic studies. For peptidomic analysis different techniques are evaluated, among them extraction and preliminary sample cleanup, fractionation by ultrafiltration, low-pressure liquid chromatography, and solid-phase extraction.
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Acknowledgments
The authors thank the Spanish Ministry of Economy and Competitiveness for the financial support from Projects AGL2011-24643, FUN-C-Food CSD2007-0063, and Project P2009/AGR-1469. D. Martínez Maqueda and B. Hernández-Ledesma thank Spanish National Research Council (CSIC) for their JAE-Pre and Ramón y Cajal Contracts, respectively.
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Martínez-Maqueda, D., Hernández-Ledesma, B., Amigo, L., Miralles, B., Gómez-Ruiz, J.Á. (2013). Extraction/Fractionation Techniques for Proteins and Peptides and Protein Digestion. In: Toldrá, F., Nollet, L. (eds) Proteomics in Foods. Food Microbiology and Food Safety, vol 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-5626-1_2
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