Optical visualization and quantification of enzyme activity using dynamic droplet lenses

Area of Science:

• Biochemistry
• Materials Science
• Analytical Chemistry

Background:

• Enzyme activity assays are crucial for biological and diagnostic applications.
• Monitoring enzyme kinetics often requires complex instrumentation or specific reagents.
• Complex emulsions offer tunable properties sensitive to molecular interactions.

Purpose of the Study:

• To develop a novel, simplified method for measuring enzyme activity.
• To utilize changes in complex emulsion morphology for enzyme kinetic monitoring.
• To validate the method across different enzyme classes and reaction mechanisms.

Main Methods:

• Enzyme-responsive surfactants were designed to alter complex emulsion morphology.
• Changes in emulsion structure were correlated with light transmission.
• Photodetector measurements were used to quantify light modulation.
• Enzyme activity was measured for amylase, lipase, and sulfatase.

Main Results:

• Demonstrated a correlation between emulsion reconfiguration and enzyme activity.
• Successfully monitored enzyme kinetics using simple photodetector readings.
• Validated the approach for diverse enzymes (amylase, lipase, sulfatase).
• Showcased two distinct enzyme-responsive coupling mechanisms (host-guest interactions and molecular cleavage).

Conclusions:

• The developed method provides a sensitive and straightforward approach to enzyme activity measurement.
• Complex emulsion reconfiguration serves as a robust indicator for enzyme kinetics.
• This technique offers a versatile platform for enzyme analysis with potential diagnostic applications.