A Pipette for High-Resolution Sampling and Delivery of pL Bio-Samples

Area of Science:

• Biotechnology
• Microfluidics
• Environmental Science

Background:

• Conventional methods for biological sample handling, like pipettes and needles, suffer from dead volume and sample waste.
• Processing pathogenic bacteria, such as Escherichia coli (E. coli), from environmental wastewater is labor-intensive and complex.

Purpose of the Study:

• To develop an integrated system combining a pipette and microfluidic chip for efficient bacteria sampling and delivery.
• To overcome the limitations of conventional methods in terms of precision, waste, and procedural complexity.

Main Methods:

• Development of a pipette integrated with a microfluidic chip featuring a cross-channel structure for droplet generation.
• Incorporation of a constant temperature unit, automated control programs (suction, heating, liquid discharge, cleaning), and a display.
• Demonstration of picoliter (pL) droplet generation, transportation, storage, and quantitative detection of E. coli.

Main Results:

• Successful generation, transportation, and storage of pL droplets containing E. coli samples.
• Accurate quantitative detection of E. coli across various concentrations.
• Demonstrated overall system reliability and data consistency.

Conclusions:

• The integrated pipette and microfluidic chip system enables precise pL volume sampling.
• This innovative device offers a simplified and promising solution for bio-sample handling and delivery, particularly in remote settings.
• The system addresses challenges associated with conventional laboratory techniques for valuable and pathogenic bio-samples.