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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Medical Diagnostics

Background:

  • Accurate detection and quantification of nano-sized bioparticles (DNA, proteins, viruses, exosomes) are crucial for disease diagnostics.
  • Current methods often require complex labeling or are less sensitive.

Purpose of the Study:

  • To develop and demonstrate a sensitive, label-free method for detecting and quantifying nano-sized bioparticles.
  • To explore the potential of deterministic lateral displacement (DLD) for bioparticle sensing.

Main Methods:

  • Utilized a DLD device with micrometer-sized pillars to analyze 1 µm polymer beads.
  • Measured changes in bead size and/or electrostatic charge caused by captured target bioparticles.
  • Quantified bioparticles by analyzing the lateral displacement of beads in the DLD array.

Main Results:

  • Successfully detected albumin protein at concentrations as low as 10 ng/mL (150 pM).
  • Detected nano-sized polymer vesicles at concentrations of 3.75 μg/mL.
  • Demonstrated a sensitive, label-free detection mechanism based on bead displacement.

Conclusions:

  • The developed label-free DLD method provides sensitive detection of nano-sized bioparticles.
  • This approach is suitable for point-of-care diagnostics due to its low cost, speed, and sensitivity.
  • Requires only a standard laboratory microscope for detection, enhancing accessibility.