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- W2024816814 abstract "Six amino acids with pIs that ranged from 3.2 to 9.7 were used as ampholytes to establish a pH gradient in capillary isoelectric focusing. This amino acid-based capillary isoelectric focusing (cIEF) was coupled with ESI-MS/MS using an electrokinetically pumped sheath-flow interface for peptide analysis. Amino acid-based isoelectric focusing generates a two-order of magnitude lower background signal than commercial ampholytes in the important m/z range of 300–1800. Good focusing was achieved for insulin receptor, which produced ∼10 s peak width. For 0.1 mg mL−1 bovine serum albumin (BSA) digests, 24 ± 1 peptides (sequence coverage 47 ± 4%) were identified in triplicate analysis. As expected, the BSA peptides were separated according to their pI. The concentration detection limit for the BSA digests is 7 nM and the mass detection limit is 7 fmole. A solution of six bovine protein tryptic digests spanning 5 orders of magnitude in concentration was analyzed by amino acid based cIEF-ESI-MS/MS. Five proteins with a concentration range spanning 4 orders of magnitude were identified in triplicate runs. Using amino acid based cIEF-ESI-MS/MS, 112 protein groups and 303 unique peptides were identified in triplicate runs of a RAW 264.7 cell homogenate protein digest. In comparison with ampholyte based cIEF-ESI-MS/MS, amino acid based cIEF-ESI-MS/MS produces higher resolution of five acidic peptides, much cleaner mass spectra, and higher protein spectral counts." @default.
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- W2024816814 date "2012-10-01" @default.
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- W2024816814 title "On-line amino acid-based capillary isoelectric focusing-ESI-MS/MS for protein digests analysis" @default.
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- W2024816814 doi "https://doi.org/10.1016/j.aca.2012.04.026" @default.
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