A facile MALDI-TOF mass spectrometric platform for quantitative analysis of protein biomarkers was developed based on magnetic ZnFeO nanoparticles and mass tagging signal amplification. In this platform, magnetic ZnFeO nanoparticles functionalized with an aptamer of the biomarker of interest was used to magnetically separate silica nanoparticles modified with another aptamer of the target biomarker and a barcoding peptide from solution phase in the presence of the biomarker of interest. After the silica nanoparticles were dissolved by KHF, the released barcoding peptide was detected by MALDI-TOF mass spectrometry with magnetic ZnFeO nanoparticles used as assisting matrix of laser desorption ionization.
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