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Updated: Jun 11, 2025

Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications

Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications

Published on: February 6, 2016

Highly Stable Biotemplated InP/ZnSe/ZnS Quantum Dots for In Situ Bacterial Monitoring.

Hanie Yousefi^1,2, Laxmi Kishore Sagar³, Armin Geraili⁴

¹Chan Zuckerberg Biohub Chicago, Chicago, Illinois 60607, United States.

ACS Applied Materials & Interfaces

|October 7, 2024

Summary

New quantum dots (QDs) offer a low-toxicity alternative for biomedical use. These water-soluble QD-aptamers provide stable, selective detection of bacterial proteins, enabling new diagnostic tools.

Keywords:

InP/ZnSe/ZnS quantum dots aptamers bacterial monitoring biosensing imaging nanoparticles quantum dots

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Last Updated: Jun 11, 2025

Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications

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Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Area of Science:

Nanotechnology and Materials Science
Biomedical Engineering
Analytical Chemistry

Background:

Traditional semiconductor quantum dots (QDs) face limitations in biomedical applications due to heavy metal toxicity and environmental concerns.
Existing QDs exhibit surface chemistry challenges, hindering stability in aqueous environments crucial for bioconjugation.
Indium phosphide/zinc selenide/zinc sulfide (InP/ZnSe/ZnS) QDs offer lower toxicity but still require improved bioconjugation strategies.

Purpose of the Study:

To develop water-soluble, stable quantum dots for biomedical applications.
To create a bioconjugation method for InP/ZnSe/ZnS QDs that enhances stability and targeting specificity.
To demonstrate the utility of these novel quantum dots for detecting bacterial membrane proteins.

Main Methods:

Synthesis of biotemplated InP/ZnSe/ZnS-aptamer quantum dots (QDAPTs) for water solubility and stability.
Evaluation of QDAPT binding kinetics, brightness, and stability in aqueous solvents over time.
Demonstration of bacterial membrane protein detection on surfaces using a hand-held imaging device.

Main Results:

QDAPTs exhibited long-term stability (up to 3 months) in aqueous solutions.
Fast binding reaction kinetics (less than 5 minutes) and high brightness were observed.
Successful detection of bacterial membrane proteins on common surfaces was achieved.

Conclusions:

Biotemplated InP/ZnSe/ZnS-aptamer quantum dots (QDAPTs) provide a stable, water-soluble, and highly selective platform for biomedical applications.
QDAPTs overcome previous surface chemistry limitations, enabling efficient bioconjugation and rapid detection.
This technology holds significant potential for developing advanced diagnostic tools for bacterial infections.