Fast and Precise Temperature Control for Axon Stretch Growth Bioreactor Based on Fuzzy PID Control

Area of Science:

• Biotechnology
• Neuroscience
• Control Systems Engineering

Background:

• Maintaining a constant temperature is critical for successful in vitro cell culture.
• Traditional cell incubators provide temperature control, but specialized equipment like bioreactors may require integrated solutions.
• Existing bioreactors face challenges with component longevity due to environmental factors within incubators.

Purpose of the Study:

• To design and implement a constant temperature control system for a multi-channel axon stretch growth bioreactor.
• To evaluate the effectiveness of fuzzy PID control compared to traditional PID control for bioreactor temperature regulation.
• To enable independent cell culture capabilities within the bioreactor.

Main Methods:

• Simulation and experimental application of fuzzy PID and traditional PID control algorithms using an STM32F4 microcontroller.
• Integration of the control system into a multi-channel axon stretch growth bioreactor.
• Culturing of human pluripotent stem cell-derived nerve cells in a specialized chamber within the controlled environment.

Main Results:

• Fuzzy PID control demonstrated reduced overshoot and improved precision compared to traditional PID control.
• Experimental data confirmed the effectiveness of fuzzy PID control in maintaining a constant temperature suitable for cell growth.
• Successful culture and observation of well-developed axons from human pluripotent stem cell-derived nerve cells.

Conclusions:

• The developed fuzzy PID control system effectively maintains a stable temperature for cell culture within the axon stretch growth bioreactor.
• This system enhances the functionality of the bioreactor, allowing for independent cell culture and improved equipment lifespan.
• The successful culture of nerve cells with developed axons highlights the potential for future applications in nerve damage repair.