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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Development of a Generic Bio-Interface for Immuno-Biodetection on an Oxide Surface Targeting Pathogen Bacteria.

Thibaut Zwingelstein1, Thérèse Leblois1, Vincent Humblot1

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This study presents a novel antibody-based biointerface for detecting pathogenic bacteria. The developed biointerface demonstrates high specificity and sensitivity, offering a cost-effective solution for microbial contamination detection in various fields.

Keywords:
biointerfacelithium niobatepathogen bacteria biosensorspecific bacteria detection

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Area of Science:

  • Biosensing and Bioengineering
  • Materials Science
  • Microbiology

Background:

  • Increasing microbial contamination necessitates rapid, selective, and sensitive detection methods.
  • Acoustic wave biosensors offer potential for meeting these detection criteria.
  • Existing methods often lack selectivity, sensitivity, or cost-effectiveness.

Purpose of the Study:

  • To develop a generic, antibody-based biointerface for detecting a wide range of pathogenic bacteria.
  • To functionalize various surfaces, including fragile materials, using silane-oxide chemistry.
  • To demonstrate the specificity and sensitivity of the developed biointerface for bacterial detection.

Main Methods:

  • Utilized self-assembled monolayers (SAMs) of aminopropyltriethoxysilane (APTES) and phenylene diisothiocyanate (PDITC) for antibody grafting.
  • Developed biointerfaces on titanium and lithium niobate surfaces using two APTES grafting routes (toluene/heat vs. chloroform/room temperature).
  • Employed surface characterization techniques (FTIR-ATR, XPS, WCA) and static biodetection experiments.

Main Results:

  • Achieved comparable APTES grafting efficiency on titanium using both toluene and chloroform routes.
  • Demonstrated successful biointerface elaboration on fragile surfaces using a mild chloroform-based method.
  • Achieved high specificity in detecting *L. monocytogenes* (98% vs. *E. coli*, 85% vs. *L. innocua*) in static conditions.

Conclusions:

  • Successfully developed a versatile biointerface for pathogenic bacterial detection using APTES and PDITC.
  • The developed method is transferable to various surfaces, including fragile materials, and offers a mild functionalization route.
  • The biointerface exhibits high specificity and sensitivity, making it suitable for microbial contamination monitoring.