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Compact Quantum Dots for Single-molecule Imaging
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Quantum Dot Composite Colloids with Layer-by-Layer Shells: Biological Self-Assemblies for Signal Amplified Detection.

Wonseok Lee1, Junhwa Lee1, Hyunjung Lee1

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea.

ACS Nano
|August 20, 2025
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Summary

Quantum dot composite colloids (QDCCs) offer enhanced signal reporting. These robust, functionalized nanoparticles enable ultrasensitive, enzyme-free C-reactive protein detection, significantly improving quantification platforms.

Keywords:
immunoassaylayer-by-layerpolyelectrolytesquantum dotssignal amplificationsurface integrityzwitterions

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Quantum dot composite colloids (QDCCs) are submicron particles containing multiple quantum dots (QDs) used as signal reporters.
  • Amphiphilic polyethylenimine derivative (amPEI) encapsulates QDs to form amPEI-QDCCs (~100 nm hydrodynamic size), with each QDCC containing ~20 QDs.

Purpose of the Study:

  • To enhance the robustness and functionalization of QDCCs for improved signal reporting.
  • To develop a sensitive, enzyme-free immunoassay for C-reactive protein (CRP) detection using functionalized QDCCs.

Main Methods:

  • Layer-by-layer (LbL) assembly was used to create multilayer shells on amPEI-QDCCs, enhancing structural integrity and preventing ion intrusion.
  • QDCCs were functionalized with zwitterionic (ZW) moieties for improved colloidal stability across a wide pH and salt concentration range.
  • Streptavidin (SA)/biotin conjugation enabled specific labeling, and a sandwich immunoassay format was employed for CRP detection.

Main Results:

  • LbL shells improved QDCC robustness, allowing surface functionalization with various moieties, including ZW groups.
  • ZW-functionalized QDCCs demonstrated excellent stability in challenging conditions (pH 5-10, saturated NaCl).
  • The developed enzyme-free FL immunoassay achieved a highly sensitive CRP detection limit of 15.9 fM within 6 minutes.

Conclusions:

  • Functionalized QDCCs provide a stable and versatile platform for biosensing applications.
  • The developed immunoassay significantly outperforms conventional methods in sensitivity and speed for CRP quantification.
  • QDCCs show great promise for developing ultrasensitive detection platforms in diagnostics and research.