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Geometric Flow Control Lateral Flow Immunoassay Devices (GFC-LFIDs): A New Dimension to Enhance Analytical

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Geometric flow control (GFC) in nitrocellulose membranes enhances lateral flow immunoassay devices (LFIDs). This innovation boosts sensitivity and reduces antibody use for point-of-care diagnostics.

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Materials Science

Background:

  • Nitrocellulose (NC) membrane-based lateral flow immunoassay devices (LFIDs) are crucial for point-of-care (PoC) diagnostics.
  • Current LFID optimization is limited by bioassay chemistry, membrane porosity, and biolabel systems, hindering advanced applications.
  • The fundamental design of conventional LFIDs has remained largely unchanged, presenting a bottleneck for performance improvements.

Purpose of the Study:

  • To introduce a novel design principle for LFIDs based on geometric flow control (GFC) of NC membranes.
  • To enhance the analytical performance and broaden the applicability of LFIDs through precise fluid dynamics manipulation.
  • To develop a scalable and cost-effective method for fabricating improved LFID devices.

Main Methods:

  • Implementing GFC by precisely engineering geometric features of NC membranes, including constriction width (w), length (l), and angles (θ1, θ2).
  • Utilizing high-throughput laser ablation for scalable fabrication of GFC-LFID membranes.
  • Evaluating the analytical performance, specifically sensitivity and limit of detection (LoD), for interleukin-6 (IL-6) detection.

Main Results:

  • The optimized GFC-LFID (w=0.5 mm, l=7 mm, θ1=60°, θ2=45°) demonstrated a 10-fold increase in sensitivity for IL-6 detection compared to conventional LFIDs.
  • Antibody consumption was reduced by 10-fold with the GFC-LFID design.
  • The GFC-LFID achieved a linear detection range of 0.1–10 ng/mL for IL-6, with an LoD of 29 pg/mL, outperforming some commercial devices.

Conclusions:

  • Geometric flow control offers a new dimension for LFID design and optimization, significantly improving analytical performance.
  • The facile and scalable laser ablation fabrication process is suitable for mass production of GFC-LFIDs.
  • This GFC-LFID approach, with its improved sensitivity, reduced reagent consumption, and scalable manufacturing, is poised to impact future LFID design and applications in diagnostics.