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Sensitive targeted multiple protein quantification based on elemental detection of quantum dots.

Antonio R Montoro Bustos1, Marta Garcia-Cortes1, Hector González-Iglesias2

  • 1Department of Physical and Analytical Chemistry, University of Oviedo, Julián Clavería 8, Oviedo 33006, Spain.

Analytica Chimica Acta
|May 24, 2015
PubMed
Summary

This study introduces a universal method for quantifying proteins using Quantum Dots (QDs) and elemental mass spectrometry (ICP-MS). This approach simplifies protein detection in human serum, offering improved sensitivity over traditional methods.

Keywords:
Elemental mass spectrometryImmunoassayLabelingProtein quantificationQuantum Dots

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Materials Science

Background:

  • Traditional protein quantification methods often require specific antibody-QD bioconjugation for each target.
  • Elemental mass spectrometry (ICP-MS) offers high sensitivity but requires robust labeling strategies.

Purpose of the Study:

  • To develop a generic, adaptable strategy for protein quantification using Quantum Dots (QDs) as elemental labels.
  • To enable protein detection via immunoassays coupled with Inductively Coupled Plasma Mass Spectrometry (ICP-MS).

Main Methods:

  • Synthesis of streptavidin-modified QDs (QDs-SA) bioconjugated to biotinylated secondary antibodies (b-Ab2).
  • Application of the QDs-SA-b-Ab2 platform for sequential quantification of five target proteins in human serum.
  • Validation of results using UV-vis spectrophotometry and commercial ELISA kits.

Main Results:

  • The generic strategy successfully quantified five proteins (transferrin, complement C3, apolipoprotein A1, transthyretin, apolipoprotein A4) in human serum.
  • ICP-MS demonstrated a one order of magnitude lower detection limit (0.23 fmol absolute for transferrin) compared to spectrophotometry (3.2 fmol absolute).
  • ICP-MS enabled quantitative control of immunoassay steps and development of a faster indirect assay format.

Conclusions:

  • The developed generic QD-based immunoassay strategy simplifies protein quantification by eliminating the need for specific QD-antibody bioconjugation for each analyte.
  • ICP-MS detection provides superior sensitivity and allows for process control in immunoassays.
  • This method offers a versatile platform for sensitive protein analysis in complex biological samples.