Fluorogenic Sensing of Carcinogenic Bisphenol A using Aptamer-Capped Mesoporous Silica Nanoparticles

Area of Science:

• Nanotechnology
• Chemical Sensing
• Environmental Science

Background:

• Bisphenol A (BPA) is a toxic chemical with widespread environmental presence.
• Accurate and sensitive detection methods for BPA are crucial for environmental monitoring and public health.
• Existing detection methods may lack selectivity or sensitivity for low BPA concentrations.

Purpose of the Study:

• To develop a novel sensor for the selective and sensitive detection of bisphenol A.
• To utilize mesoporous silica nanoparticles functionalized with a BPA-specific aptamer for targeted chemical sensing.
• To achieve a low limit of detection for bisphenol A in environmental samples.

Main Methods:

• Mesoporous silica nanoparticles were synthesized and loaded with rhodamine B.
• The nanoparticles were capped with a bisphenol A aptamer, creating a responsive nanostructure.
• The selective opening of nanoparticle pores upon binding with bisphenol A triggered rhodamine B release for detection.

Main Results:

• The developed sensor demonstrated selective detection of bisphenol A.
• A highly sensitive detection was achieved, with a limit of detection as low as 3.5 μm.
• The aptamer-nanoparticle interaction effectively controlled the release of the dye, enabling signal generation.

Conclusions:

• Aptamer-functionalized mesoporous silica nanoparticles offer a promising platform for sensitive and selective bisphenol A detection.
• This approach provides a new tool for monitoring environmental contaminants like BPA.
• The study highlights the potential of smart nanomaterials in chemical sensing applications.