Cell Density Detector Based on Light Beam Focusing.

Area of Science:

• Biomedical Engineering
• Optical Sensing
• Cell Biology

Background:

• Lab-on-a-chip systems offer versatile applications but achieving simple, low-cost, high-accuracy cell counters remains a research challenge.
• Accurate cell density measurement is crucial for various biological and medical applications, including drug discovery and diagnostics.

Purpose of the Study:

• To develop and characterize a novel cell counter utilizing light beam focusing for measuring adherent cell density.
• To demonstrate the feasibility of a simple, low-cost optical sensor for cell counting applications.

Main Methods:

• A polydimethylsiloxane (PDMS)-based collimating lens was fabricated for optical fibers.
• Adherent cells were utilized as convex lenses to focus collimated light.
• The intensity of the focused light was measured to correlate with cell density.

Main Results:

• The sensor achieved a detection limit of 8.3 × 10⁴ cells/mL for Hela cells.
• A detection range from 0.1 × 10⁶ cells/mL to 1.0 × 10⁶ cells/mL was established.
• The focused light intensity directly correlated with the density of adherent cells.

Conclusions:

• The developed light beam focusing cell counter offers a simple, low-cost, and accurate method for measuring adherent cell density.
• This technology shows significant potential for applications in drug screening, cell pathology analysis, and cancer pre-diagnosis.