Ion-pair Reversed-phase×Low-pH Reversed-phase Two-dimensional Liquid Chromatography for In-depth Proteomic Profiling

Abstract

High-resolution liquid chromatography separation is essential to in-depth proteomic profiling of complex biological samples. Herein, we established an ion-pair reversed-phase×reversed-phase two-dimensional liquid chromatography (IPRP×RP 2DLC) strategy for comprehensive proteomic analysis. Both RPLC separation dimensions were performed at low pH, with trifluoroacetic acid(TFA) and formic acid(FA) as mobile phase addictive, respectively. As the good separation resolution offered by ion-pairing effect of TFA, the fractionation efficiency was greatly improved with 74.0% peptides identified in just one fraction. Comparing with conventional high pH RP fractionation, the overall separation rate of IPRP was about 1.6 times that of high-pH RP, which increased the number of identified peptides by 21%. Further, 2169 proteins and 8540 peptides were confidently identified from crude serum sample by our IPRP×RP 2DLC strategy, exhibiting great potential in clinical proteomics in the future.

Keywords

Two-dimensional liquid chromatography(2DLC) / Ion-pair reversed-phase liquid chromatography(IPRP-LC) / IPRP×low-pH RP 2DLC / Proteomics / Mass spectrometry

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