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Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
Published on: March 22, 2020
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Gold nanoclusters stabilized with dopa-containing ligands: Catalyst-indicator integrated probe for tumor cell
Jin-Ao Li1, Nana Pan2, Zichun Qi1
1State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China.
Talanta
|October 5, 2024
Summary
Researchers developed a novel fluorescent gold nanocluster system for detecting hydrogen peroxide (H2O2) inside cells. This enzyme-free method offers sensitive detection of H2O2, aiding in disease diagnosis and monitoring physiological states.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Analytical Chemistry
Background:
- Elevated hydrogen peroxide (H2O2) levels are linked to cellular damage and disease, particularly in tumor cells.
- Accurate detection of H2O2 is crucial for monitoring physiological status and early cancer diagnosis.
Purpose of the Study:
- To develop an enzyme-free, monomeric system for sensitive intracellular H2O2 detection.
- To create a novel fluorescent probe for real-time monitoring of H2O2 levels within cells.
Main Methods:
- Synthesis of fluorescent gold nanoclusters (AuNCs) using dopa-containing peptidomimetics.
- Utilizing AuNCs as both peroxidase-like catalysts and fluorescent indicators for H2O2.
- Evaluating the sensitivity and linear detection range of the AuNCs for H2O2.
Main Results:
- The synthesized GDpE-AuNCs demonstrated high sensitivity for H2O2 detection, with a limit of detection of 0.49 μM.
- A linear detection range of 5–1000 μM was established for the AuNCs.
- The integrated catalyst-indicator system showed efficient cellular uptake and enabled intracellular H2O2 detection and tumor cell discernment.
Conclusions:
- The developed enzyme-free AuNC system provides a sensitive and efficient platform for intracellular H2O2 detection.
- This approach facilitates real-time monitoring of physiological states and holds promise for early disease diagnosis, especially for cancers.
- The combined catalytic and fluorescent properties of the AuNCs offer a unique advantage for biological sensing applications.
