Easy-to-Operate Co-Flow Step Emulsification Device for High-Throughput Three-Dimensional Cell Culture

Area of Science:

• Biotechnology
• Microfluidics
• Cell Biology

Background:

• Three-dimensional (3D) in vitro cell culture offers superior mimicry of in vivo conditions compared to 2D cultures.
• Accurate cell-environment interactions are crucial for applications like tissue engineering and drug screening.
• Existing methods often lack scalability and integration for comprehensive cell monitoring.

Purpose of the Study:

• To develop an integrated droplet-based microfluidic chip for 3D cell culture and in situ monitoring.
• To achieve scalable and high-throughput cell culture using a novel microfluidic approach.
• To provide a low-cost, user-friendly platform for advanced in vitro cell studies.

Main Methods:

• Utilized a microfluidic "co-flow step emulsification" technique to create close-packed droplet arrays.
• Engineered a device capable of producing droplets ranging from 55.29 ± 1.52 to 95.64 ± 3.35 μm.
• Integrated cell distribution, 3D culture, and real-time cell monitoring within a single chip.

Main Results:

• Achieved an ultra-high droplet volume fraction of 72%, preventing cell adhesion and enabling 3D culture.
• Demonstrated successful 3D culture of Saccharomyces cerevisiae with an 80.34 ± 3.77% proliferation rate.
• The microfluidic chip costs approximately USD 3 per unit, highlighting its cost-effectiveness.

Conclusions:

• The developed microfluidic chip offers a low-cost, scalable, and integrated solution for 3D cell culture.
• Its high-throughput and miniaturized nature make it suitable for diverse biological applications.
• Potential applications include drug toxicology, pharmacokinetics, and advanced tissue engineering models.