Tubaon RM, Haddad PR, Quirino JP. Membrane-Free Electrokinetic Device Integrated to Electrospray-Ionization Mass Spectrometry for the Simultaneous Removal of Sodium Dodecyl Sulfate and Enrichment of Peptides.
Anal Chem 2018;
90:10122-10127. [PMID:
30074774 DOI:
10.1021/acs.analchem.8b01707]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The removal of sodium dodecyl sulfate (SDS) in SDS-assisted proteomics with electrospray-ionization-mass-spectrometric (ESI-MS) analysis is an essential step in the analysis. Off-line state-of-the-art sample-preparation strategies can allow 100% removal of DS- and up to 100% peptide recoveries. These strategies, however, are typically laborious and require long analysis times and a complex experimental setup. Here, we developed a simple, membrane-free, electrokinetic, on-line, integrated SDS removal-ESI-MS device that was able to enhance ESI-MS signals of bradykinin and peptides from trypsin-digested bovine serum albumin (BSA) in samples that contained SDS micelles. The significant peptide-signal improvements were contributed by the complete removal of DS- and the enrichment of the peptides in the presence of an electric field. Enrichment was via micelle-to-solvent stacking, initially developed in capillary electrophoresis. Bradykinin percent recovery was 800%, and BSA peptide percent recovery was 87%. Enhancement factors in ESI-MS signals (after and before removal) for selected m/ z values of peptides from the BSA digest were 535-693.
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