Cost-effective side-illumination darkfield nanoplasmonic marker microscopy.

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Optical Imaging

Background:

• Plasmonic nanoparticles (NPs) offer potential as biological markers.
• Multiplexed analysis requires sensitive and specific detection methods.
• Current methods for NP detection in cytology can be limited in contrast and resolution.

Purpose of the Study:

• To develop an innovative technology for quantitative multiplexed cytology analysis.
• To utilize spectrally distinctive plasmonic NPs as optical probes.
• To employ cost-effective side-illumination multispectral darkfield microscopy (SIM) for differential NP imaging.

Main Methods:

• Developed a novel side-illumination multispectral darkfield microscopy (SIM) system.
• Employed spectrally distinctive plasmonic nanoparticles (NPs) as optical probes.
• Utilized arrays of discrete color RGB LEDs for lateral illumination and a conventional CMOS color camera for detection.

Main Results:

• Demonstrated enhanced contrast and higher resolution for individual NP detection in liquid media.
• Showcased improved detection of NP markers attached to cell membranes in cytology preparations.
• Validated the effectiveness of the SIM method compared to conventional darkfield microscopy (DFM).

Conclusions:

• The developed SIM technology provides a cost-effective and efficient method for NP imaging.
• This system simplifies the adaptation of plasmonic NPs as reliable biological multiplexed chromatic markers.
• The technology is compatible with existing clinical microscopy equipment, facilitating biodetection and diagnosis.