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Ultrafast and Sensitive Screening of Pathogens by Functionalized Janus Microbeads-Enabled Rotational Diffusometry in

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  • 1Department of Biomedical Engineering National Cheng Kung University Tainan city 70101 Taiwan.

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Summary

A novel biosensing method combines rotational diffusometry and loop-mediated isothermal amplification (LAMP) for rapid detection of Escherichia coli. This ultrafast technique offers high sensitivity and requires minimal sample volume, addressing limitations of conventional polymerase chain reaction (PCR).

Keywords:
DNAEscherichia colifunctionalized Janus microbeadsloop-mediated isothermal amplificationnucleic acidpathogen screeningrotational diffusometry

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Area of Science:

  • Molecular Diagnostics
  • Biosensing Technology
  • Microbiology

Background:

  • Conventional polymerase chain reaction (PCR) is accurate but time-consuming, labor-intensive, and requires specialized equipment.
  • There is a significant need for faster, more sensitive nucleic acid amplification-based detection methods.
  • Escherichia coli (E. coli) detection is crucial for public health and food safety.

Purpose of the Study:

  • To develop and validate an ultrafast and sensitive biosensing method for rapid screening of E. coli.
  • To combine rotational diffusometry with loop-mediated isothermal amplification (LAMP) for enhanced detection capabilities.
  • To overcome the limitations of conventional PCR in terms of speed, labor, and equipment dependency.

Main Methods:

  • Utilized functionalized Janus microbeads for rotational diffusometry to measure solution viscosity changes.
  • Employed loop-mediated isothermal amplification (LAMP) for nucleic acid amplification.
  • Quantified rotational diffusivity from microbead blinking signals to detect E. coli presence.

Main Results:

  • Achieved a limit of detection of 42.8 fg/μL for E. coli within 10 minutes.
  • Required a minimal sample volume of 2 μL.
  • Successfully detected E. coli whole cells in artificially contaminated milk, juice, and water samples, with results validated against real-time PCR.

Conclusions:

  • The developed rotational diffusometry-LAMP biosensing technique provides a rapid, reliable, and low-volume screening tool for E. coli.
  • This method significantly improves upon the speed and efficiency of traditional diagnostic techniques.
  • It offers a promising advancement for microbial detection in various sample matrices, enhancing food and water safety protocols.