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Related Concept Videos

Automated Microbial Diagnostics01:24

Automated Microbial Diagnostics

Automated diagnostic analyzers have transformed clinical microbiology by providing rapid and reliable methods for pathogen identification and antibiotic susceptibility testing. Among these systems, the Vitek 2 is widely used because it automates the traditionally labor-intensive processes of microbial identification (ID) and antibiotic susceptibility testing (AST), delivering standardized and timely results that are essential for effective patient care.Microbial Identification with ID CardsThe...
Enzyme-Linked Immunosorbent Assay01:33

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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
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Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays
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Micromotor-based lab-on-chip immunoassays.

Miguel García1, Jahir Orozco, Maria Guix

  • 1Department of Nanoengineering, University of California-San Diego, La Jolla, CA 92093, USA. josephwang@ucsd.edu.

Nanoscale
|November 6, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces self-propelled, antibody-functionalized microengines for capturing and transporting proteins on lab-on-a-chip devices. These innovative nanomotors enable efficient immunoassays without fluid flow, advancing diagnostic technologies.

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Chemical Engineering

Background:

  • Traditional immunoassays on lab-on-a-chip (LOC) devices often require bulk fluid flow and washing steps.
  • Developing efficient methods for selective biomolecule capture and transport within LOC systems is crucial for advanced diagnostics.

Purpose of the Study:

  • To demonstrate the first use of self-propelled, antibody-functionalized synthetic catalytic microengines for protein capture and transport in LOC devices.
  • To develop a novel microchip immunoassay platform that eliminates the need for bulk fluid flow and common washing steps.

Main Methods:

  • Fabrication of catalytic polymer/Ni/Pt microtube engines with antibody functionalization for selective protein recognition.
  • Implementation of a microchip format for 'on-the-fly' double-antibody sandwich assays (DASA) and antigen transport.
  • Utilizing secondary antibodies with polymeric-sphere tracers for visualization and anti-protein-A modified microengines for bacterial capture and detection.

Main Results:

  • Selective capture and transport of target proteins in the presence of non-target proteins using antibody-functionalized microengines.
  • Successful demonstration of a label-free optical detection of Staphylococcus aureus bacteria using anti-protein-A modified microengines.
  • Visualization of binding events through secondary antibodies tagged with polymeric-sphere tracers.

Conclusions:

  • Self-propelled antibody-functionalized microengines offer a novel approach for efficient immunoassays on LOC devices.
  • This nanomotor-based microchip immunoassay platform has significant potential for clinical diagnostics, environmental monitoring, and security applications.
  • The developed technology enables active transport of captured analytes, simplifying assay procedures and enhancing detection capabilities.