Abstract
The development of peptide/protein analyte assays for the purpose of diagnostic tests is driven by multiple factors, including sample availability, required throughput, and quantitative reproducibility. Laser Desorption/ionization mass spectrometry methods (LDI-MS) are particularly well suited for both peptide and protein characterization, and combining chromatographic surfaces directly onto the MS probe in the form of surface enhanced laser desorption/ionization (SELDI)-biochips has improved the reproducibility of analyte detection and provided effective relative quantitation. Here, we provide methods for developing reproducible SELDI-based assays by providing a complex artificial protein matrix background within the sample to be analyzed that allows for a common and reproducible ionization background as well as internal normalization standards. Using this approach, quantitative assays can be developed with CVs typically less than 10% across assays and days. Although the method has been extensively and successfully implemented in association with a protein matrix from E. coli, any other source for the complex protein matrix can be considered as long as it adheres to a set of conditions including the following: (1) the protein matrix must not provide interferences with the analyte to be detected, (2) the protein matrix must be sufficiently complex such that a majority of ion current generated from the desorption of the sample comes from the complex protein matrix, and (3) specific and well-resolved protein matrix peaks must be present within the mass range of the analyte of interest for appropriate normalization.
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© 2012 Springer Science+Business Media, LLC
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Lomas, L., Clarke, C.H., Thulasiraman, V., Fung, E. (2012). Optimized Conditions for a Quantitative SELDI TOF MS Protein Assay. In: Clarke, C., McCarthy, D. (eds) SELDI-TOF Mass Spectrometry. Methods in Molecular Biology, vol 818. Springer, New York, NY. https://doi.org/10.1007/978-1-61779-418-6_1
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DOI: https://doi.org/10.1007/978-1-61779-418-6_1
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Online ISBN: 978-1-61779-418-6
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