Department of Chemistry
N-phosphorylation labeling for analysis of twenty natural amino acids and small peptides by using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
N-phosphorylation labeling was utilized to analyze the low molecular weight compounds by using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). A wide range of natural amino acids and short peptides was successfully analyzed by MALDI-TOF MS without matrix background interferences. The N-phosphorylation labeling reaction was carried out easily within 30 min in a one-pot reaction under mild reaction conditions. The phosphoryl derivatization reaction is a global labeling approach with high selectivity and high specificity with targeting only on the N-terminal and ε-amino group of Lys. The incorporation of a neutral phosphoryl group with high gas-phase affinity of protons not only improves the ionization efficiency of target molecules and simultaneously decreases the ion suppression effects in MALDI-TOF MS analysis, but also greatly reduces or eliminates the matrix background interferences by suppressing the matrix signals and increasing the molecular weight of the targeted compounds. By applying the N-phosphorylation labeling approach, many amino acids could be detected in serum samples by using MALDI-TOF MS. © 2013 The Royal Society of Chemistry.
Source Publication Title
Royal Society of Chemistry
Gao, Xiang, Xin Bi, Juntong Wei, Zhimin Peng, Hongxia Liu, Yuyang Jiang, Wei Wei, and Zongwei Cai. "N-phosphorylation labeling for analysis of twenty natural amino acids and small peptides by using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry." Analyst 138.9 (2013): 2632-2639.