A novel liquid crystal sensing platform for highly selective UO₂²⁺ detection based on a UO₂²⁺-specific DNAzyme

Area of Science:

• Analytical Chemistry
• Materials Science
• Biotechnology

Background:

• Uranyl ion (UO2^2+) detection is crucial for environmental monitoring and nuclear safety.
• Existing methods for uranyl ion detection often require labels or lack selectivity.
• Development of sensitive and selective uranyl ion sensors is an ongoing challenge.

Purpose of the Study:

• To establish a label-free and selective sensor for uranyl ion (UO2^2+) detection.
• To utilize the unique properties of DNAzymes and liquid crystals (LCs) for sensing.
• To provide an efficient platform for detecting radioactive elements.

Main Methods:

• A uranyl ion (UO2^2+)-dependent DNAzyme was employed for specific substrate cleavage.
• Liquid crystals (LCs) were used as an optical signaling platform.
• The cleavage of substrate chains by the DNAzyme, triggered by uranyl ions, induced changes in LC orientation and optical signals.

Main Results:

• The sensor demonstrated high selectivity for uranyl ions (UO2^2+) due to the DNAzyme's specificity.
• A label-free detection method was successfully established.
• A low detection limit of 25 nM for uranyl ions was achieved.
• The sensor exhibited satisfactory analytical performance.

Conclusions:

• The developed sensor provides a highly selective and label-free method for uranyl ion (UO2^2+) detection.
• The combination of DNAzymes and liquid crystals offers a promising sensing platform.
• This approach can be extended for the detection of other radioactive elements.