High‐performance thin‐layer chromatography plate blotting for liquid microjunction surface sampling probe mass spectrometric analysis of analytes separated on a wettable phase plate

A blotting method that transfers analytes separated on wettable high‐performance thin‐layer chromatography (HPTLC) plates to a hydrophobic reversed‐phase C8 HPLTC plate suitable for analysis with a liquid microjunction surface sampling probe electrospray ionization mass spectrometry system was described and demonstrated. The simple blotting procedure transfers the analyte from the wettable plate to the topmost surface of a rigidly backed, easy‐to‐mount hydrophobic substrate that already has been proven viable for analysis by this sampling probe/mass spectrometry system. The utility of the approach was demonstrated by the analysis of a four‐component peptide mixture originally separated on a ProteoChrom® HPTLC cellulose sheet and then blotted onto the reversed‐phase HPTLC plate. Published in 2011 by John Wiley & Sons, Ltd.