Application of polydopamine-coated nylon capillary-channeled polymer fibers as a stationary phase for mass spectrometric phosphopeptide analysis.
Electrophoresis
; 41(3-4): 215-224, 2020 02.
Article
em En
| MEDLINE
| ID: mdl-31823396
ABSTRACT
Capillary-channeled polymer (C-CP) fibers are demonstrated as a selective stationary phase for phosphopeptide analysis via LC-MS. Taking advantage of the oxidative self-polymerization of dopamine under alkaline conditions, a simple system involving a dilute aqueous solution of 0.2% w/v dopamine hydrochloride in 0.15% w/v TRIS buffer, pH 8.5 was utilized to coat polydopamine onto nylon 6 C-CP fibers. Confirmation of the polydopamine coating on the fibers (nylon-PDA) was made through attenuated total reflection-FTIR (ATR-FTIR) analysis. Imaging using SEM was also performed to examine the morphology and topography of the nylon-PDA. Subsequent loading of Fe3+ to the nylon-PDA matrix was confirmed by SEM/energy dispersive X-ray spectroscopy (SEM/EDX). The Fe3+ -bound nylon-PDA fibers packed in a microbore column format were tested in the off-line preconcentration of phosphopeptides from a 1100 mixture of ß-casein/BSA digests for MALDI-TOF analysis. The packed column was also installed onto an HPLC system as a platform for the online sample clean-up and enrichment of phosphopeptides from a 11000 mixture of ß-casein/BSA protein digests that were determined by subsequent ESI-MS analysis.
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Base de dados:
MEDLINE
Assunto principal:
Fosfopeptídeos
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Polímeros
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Espectrometria de Massas
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Indóis
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Nylons
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article