This article introduces an integrated approach to improve sequence coverage and protein identification by combining liquid chromatography-matrix-assisted laser desorption ionization mass spectrometry (LC-MALDI MS/MS) and nanoflow liquid chromatography-tandem mass spectrometry (nano-LC/MS/MS). The coupling of RP-HPLC with MALDI via a MALDI spotting device provides an automated and robust solution for analyzing medium complexity samples using MALDI. The experimental results show that this integrated approach can improve protein coverage for complex protein samples and facilitate protein identification.
This document presents an application note detailing a method to improve proteome coverage by combining Liquid Chromatography-Matrix-Assisted Laser Desorption/Ionization (LC-MALDI) with nano-LC/MS/MS. The study utilized a three-dimensional separation strategy involving immunodepletion, strong cation exchange (SCX) fractionation, and reversed-phase chromatography to analyze human serum samples.
Direct MALDI MS/MS identified 23 proteins and 56 peptides.
Fifty fractions were collected during the offline SCX separation.