Chemotactic separation of enzymes

Area of Science:

• Biochemistry
• Chemical Engineering
• Microfluidics

Background:

• Enzyme separation is crucial for biochemical applications.
• Existing methods can be inefficient for enzymes with similar properties.
• Molecular chemotaxis offers a novel separation principle.

Purpose of the Study:

• To demonstrate a microfluidic procedure for enzyme separation based on chemotaxis.
• To quantify the separation efficiency using an enrichment coefficient.
• To validate the method with different enzyme pairs.

Main Methods:

• Utilized a two-inlet, five-outlet microfluidic network.
• Introduced enzyme mixtures and substrate solutions into separate inlets.
• Analyzed enzyme concentration profiles using fluorescence microscopy.
• Performed multiphysics simulations to model chemotactic separation.

Main Results:

• Active enzymes showed preferential migration towards the substrate gradient.
• Demonstrated spontaneous separation of active from inactive enzymes.
• Achieved separation for enzymes with similar charge and size.
• Quantified separation via an enrichment coefficient.

Conclusions:

• Molecular chemotaxis is a viable strategy for enzyme separation in microfluidic devices.
• This technique offers a novel approach for purifying enzymes.
• The method is effective even for enzymes with similar biophysical properties.