Fabrication and characterization of a microfluidic module for chemical gradient generation utilizing passive pumping

Area of Science:

• Biomedical Engineering
• Neuroscience
• Microfluidics

Background:

• Axonal guidance is crucial for neural development and function.
• Generating precise chemical gradients is challenging for current experimental methods.
• Microfluidic devices offer potential for controlled biochemical delivery.

Purpose of the Study:

• To introduce a novel micro-biochemical administration module (μBAM) for generating chemical gradients.
• To design a user-friendly, low-profile device operated solely by a pipette.
• To facilitate controlled biochemical delivery for axonal guidance studies.

Main Methods:

• A passive pumping mechanism was employed to drive fluid flow.
• Liquid was pumped through a SU-8 microchannel and a Parylene cap micropore.
• Flow rate was characterized and manipulated by varying drop volumes.

Main Results:

• The micro-biochemical administration module (μBAM) was successfully developed.
• The device demonstrated simple operation using only a pipette.
• Flow rates were characterized and controlled by adjusting drop volumes.

Conclusions:

• The μBAM provides a simple and effective method for generating chemical gradients.
• This module can be integrated with neuronal cell cultures for axonal guidance research.
• The device offers a low-cost, accessible tool for neuroscience laboratories.