Fast and accurate enzyme activity measurements using a chip-based microfluidic calorimeter

Area of Science:

• Biophysical Chemistry
• Analytical Chemistry
• Biotechnology

Background:

• Microfluidic and nanofluidic technologies have enabled the development of chip-based microfluidic calorimeters.
• These devices offer potential for accurate, high-throughput enzyme activity measurement, unlike conventional calorimeters.
• Miniaturization challenges like incomplete mixing and reduced heat generation have limited their application.

Purpose of the Study:

• To introduce a novel calibration method for chip-based microfluidic calorimeters.
• To develop a convenient protocol for utilizing these calorimeters for enzyme activity assays.
• To address limitations hindering the application of microfluidic calorimeters in enzyme analysis.

Main Methods:

• Development of a new calibration method for chip-based microfluidic calorimeters.
• Establishment of a user-friendly protocol for calorimeter operation.
• Measurement of alkaline phosphatase activity using the developed method and protocol.

Main Results:

• The new calibration method successfully addressed miniaturization issues.
• The developed protocol enabled accurate measurement of enzyme activity.
• Progress curves for alkaline phosphatase matched those obtained via UV-visible spectroscopy, confirming reliability.

Conclusions:

• The improved chip-based microfluidic calorimeter is a viable tool for high-throughput enzyme activity screening.
• This advancement facilitates applications in drug discovery and enzyme engineering.
• The developed method simplifies the use of microfluidic calorimeters for enzyme analysis.