N-(Diisopropyloxyphosphoryl)amino acids (N-Dipp-amino acids) are prepared from diisopropyl phosphite and amino acids in mixed aqueous media in one step. They can be activated by dicyclohexylcarbodiimide or other activating agents for the synthesis of N-(diisopropyloxyphosphoryl)dipeptides.
Suppression of matrix ions by N-phosphorylation labeling using matrix-assisted laser desorption–ionization time-of-flight mass spectrometry
作者:Xiang Gao、Zhi Tang、Minghua Lu、Hongxia Liu、Yuyang Jiang、Yufen Zhao、Zongwei Cai
DOI:10.1039/c2cc36091h
日期:——
N-Phosphorylation labeling was utilized to analyze small metabolites using matrix-assisted laser desorptionâionization time-of-flight mass spectrometry (MALDI-TOF MS). The incorporation of a neutral phosphoryl group with high gas-phase proton affinity not only improved the ionization efficiency of the target molecules, but also greatly reduced the matrix background interference.