We report a cyclic sample pooling technique devised in two-dimensional liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) shotgun proteomics that renders deeper proteome coverage; we combined low pH reversed-phase (RP) LC in trifluoroacetic acid in the first dimension, followed by cyclic sample pooling of the eluate and low-pH RP-LC in formic acid in the second dimension. The new protocol has a significantly higher resolving power suitable for LC-ESI-MS/MS shotgun proteomics.
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Kawashima et al. (2013) studied this question.
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