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- W2012779454 abstract "Specific capture of phosphopeptides from protein digests is a critical step for identification of phosphoproteins by mass spectrometry. In this study, we report a novel phosphopeptide-capture approach based on the specific interaction of phosphopeptides with a stainless steel target modified with magnetic affinity nanoparticles. The modification which was carried out by loading the suspension of nanoparticles into sample wells of the target did not require any pretreatment procedure to the target and did not involve chemical binding reactions. To isolate phosphopeptides, digests were loaded into the wells of the modified target for 10 min incubation, followed by rinsing with washing buffer to remove unbound species; matrix was then added to the captured phosphopeptides prior to analysis by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS). Capturing the phosphopeptides on the modified target simplified significantly analytical operations and reduced sample loss. This approach has been applied to solution digests of alpha-casein, beta-casein, and a mixture of five proteins; a number of phosphopeptides were confidently detected. Phosphopeptides from digests of 10 fmol beta-casein could be isolated and detected by MALDI-TOFMS with this method. In addition, this approach has been applied successfully to the isolation of phosphopeptides from in-gel digestive products of sub-pmol phosphoproteins after separation by sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE)." @default.
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- W2012779454 date "2007-06-20" @default.
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- W2012779454 title "Specific capture of phosphopeptides on matrix-assisted laser desorption/ionization time-of-flight mass spectrometry targets modified by magnetic affinity nanoparticles" @default.
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- W2012779454 doi "https://doi.org/10.1002/rcm.3100" @default.
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