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Direct detection of peptides and proteins on a microfluidic platform with MALDI mass spectrometry

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Abstract

The ability to detect and quantify proteins of individual cells in high throughput is of enormous biological and clinical relevance. Most methods currently in use either require the measurement of large cell populations or are limited to the investigation of few cells at a time. In this report, we present the combination of a polydimethylsiloxane-based microfluidic device to a matrix-assisted laser desorption ionization time-of-flight mass spectrometer (MALDI-TOF-MS) that allows the detection of as few as 300 molecules at the peptide level and ∼106 to 107 molecules at the protein level. Moreover, we performed an immunoassay with subsequent MALDI-TOF-MS to capture and detect insulin immobilized on a surface (∼0.05 mm2) in this device with a detection limit of 106 insulin molecules. This microfluidic-based approach therefore begins to approach the sample handling and sensitivity requirements for MS-based single-cell analysis of proteins and peptides and holds the potential for easy parallelization of immunoassays and other highly sensitive protein analyses.

Combined immunoassay and MALDI/TOF-MS for insulin in a microfluidic platform

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Acknowledgments

The authors thank Chad Borges and Matthew Schaab at the Biodesign Institute at ASU for technical assistance. The authors also thank Nicole Hansmeier for providing a tryptic BSA digest for this study.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287, USA

    Mian Yang, Tzu-Chiao Chao & Alexandra Ros

  2. Biodesign Institute, Arizona State University, Tempe, AZ, 85287, USA

    Randall Nelson

Authors
  1. Mian Yang
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  2. Tzu-Chiao Chao
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  3. Randall Nelson
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  4. Alexandra Ros
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Corresponding author

Correspondence to Alexandra Ros.

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Yang, M., Chao, TC., Nelson, R. et al. Direct detection of peptides and proteins on a microfluidic platform with MALDI mass spectrometry. Anal Bioanal Chem 404, 1681–1689 (2012). https://doi.org/10.1007/s00216-012-6257-3

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  • DOI: https://doi.org/10.1007/s00216-012-6257-3

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