Laser-Emitting Droplet Assay for Enzymatic Evaluation Applications

Area of Science:

• Biochemistry
• Analytical Chemistry
• Microfluidics

Background:

• Accurate enzymatic activity analysis is crucial but challenging in complex biological settings.
• Existing methods often lack sensitivity or require labels, limiting real-time applications.

Purpose of the Study:

• To introduce a novel laser-emitting droplet assay (LEDA) for sensitive, real-time, label-free enzymatic activity detection.
• To demonstrate the application of LEDA in analyzing biological samples like saliva and milk.

Main Methods:

• Development of a platform using laser-emitting aqueous droplets as whispering-gallery-mode (WGM) microlasers.
• Monitoring enzymatic reactions via measurable shifts in laser signals induced by biochemical changes.
• Integration with microfluidic droplet technology for automated and scalable analysis.

Main Results:

• LEDA achieved a 90-fold sensitivity increase compared to conventional microlasers due to enhanced light-matter interactions.
• Successfully assessed α-amylase activity in saliva and protein concentration in milk samples.
• Distinct spectral signatures differentiated various sample types, showcasing analytical capability.

Conclusions:

• LEDA offers a highly sensitive, label-free approach for real-time enzymatic activity monitoring.
• The assay is adaptable for diverse biochemical analyses, including diagnostics and quality control.
• Integration with microfluidics promises automated, scalable, and ultrasensitive droplet-based analysis.