Simple Staining of Cells on a Chip

Area of Science:

• Biomedical Engineering
• Microfluidics
• Cell Biology

Background:

• Simple cell staining is crucial in diagnostics and research but generates significant toxic waste.
• Existing methods are costly and environmentally burdensome due to high reagent consumption.

Purpose of the Study:

• To develop an eco-friendly and cost-effective microfluidic chip for simple cell staining.
• To reduce toxic waste generated during cell staining procedures.
• To integrate microfluidics with mobile imaging for portable cell analysis.

Main Methods:

• A magnetically driven, compartmentalized passive microfluidic chip was designed and fabricated.
• Human eukaryotic cells (K562, lymphocytes) and patient-derived lymphocytes were stained using various dyes (trypan blue, methylene blue, crystal violet, safranin).
• Stained cells were imaged using microscopy and a cell phone, with pixel intensity changes analyzed.

Main Results:

• The microfluidic chip demonstrated effective simple staining across a range of cell densities.
• Staining enhanced cell signal intensity by 25-135 pixels in microscopic images.
• The system proved ultra-low cost, reduced waste generation, and showed practicality with patient blood samples.

Conclusions:

• The developed microfluidic chip offers a sustainable, cost-effective, and portable solution for simple cell staining.
• This approach represents a novel contribution to microfluidic biosensors, with potential for pathogen detection.
• The technology integrates microfabrication with accessible imaging for broader diagnostic applications.