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Genetically engineered viruses form target-specific, colorimetric biosensors. These novel sensors detect harmful chemicals like trinitrotoluene (TNT) with high selectivity, offering new protective applications.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Natural and synthetic materials lack chemical selectivity for sensor applications.
  • Developing specific and responsive sensor platforms remains a significant challenge.

Purpose of the Study:

  • To engineer genetically modified M13 phage viruses for self-assembly into target-specific, colorimetric biosensors.
  • To demonstrate the capability of these biosensors for detecting volatile organic chemicals and specific toxicants.

Main Methods:

  • Genetically engineered M13 phage viruses were self-assembled into nanostructures.
  • Phage displayed peptide motifs for specific target binding (e.g., trinitrotoluene - TNT).
  • Colorimetric changes in response to volatile organic chemicals and TNT were analyzed.

Main Results:

  • Phage-bundle nanostructures exhibited viewing-angle independent color.
  • Exposure to volatile organic chemicals induced rapid swelling and distinct color changes.
  • TNT-specific sensors detected down to 300 parts per billion (p.p.b.) of TNT, distinguishing it from similar chemicals.

Conclusions:

  • Self-assembled, genetically engineered M13 phage create tunable, colorimetric biosensors.
  • These biosensors demonstrate high selectivity and sensitivity for target chemical detection.
  • The technology holds potential for detecting toxicants and pathogens, enhancing human health and national security.