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Updated: Jan 26, 2026

A Spin-Tip Enrichment Strategy for Simultaneous Analysis of N-Glycopeptides and Phosphopeptides from Human Pancreatic Tissues
Published on: May 4, 2022
Instrument-free enrichment and detection of phosphopeptides using paper-based Phos-PAD
Liping Li1, Yimeng Geng1, Yuhong Xiang1
1Department of Chemistry, Capital Normal University, Beijing, 100048, China.
Abstract:
The facile detection of phosphopeptides is important for clinical screening and phosphoproteomic research. This work develops an instrument-free, cost-effective, convenient paper-based method for quantitative analysis of phosphorylated peptides. With a novel portable device, Phos-PAD, this method can achieve selective enrichment and colorimetric detection of phosphopeptides within 15 min TiO2 nanoparticle-based chemisorption and tetrabromophenol blue-based colorimetric assay were integrated into the single paper-based analytical device. The color change can indicate the presence of phosphopeptides and the mean pixel intensity of the red channel can be used for phosphopeptide quantification. With capability of quantifying phosphopeptides in serum samples, this Phos-PAD assisted phosphopeptide assay may attract significant attention to clinical analysis of endogenous serum phosphopeptides.
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