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Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Using Micro-Electro-Mechanical Systems (MEMS) to Develop Diagnostic Tools
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Chiral sensing using a complementary metal-oxide semiconductor-integrated three-transducer microsensor system.

Petra Kurzawski1, Volker Schurig, Andreas Hierlemann

  • 1ETH Zurich, Department of Biosystems Science and Engineering, CH-4058 Basel, Switzerland.

Analytical Chemistry
|October 22, 2009
PubMed
Summary
This summary is machine-generated.

Chiral cyclodextrin derivatives in a polysiloxane matrix enabled three chemical sensors to discriminate chiral analytes. This sensor system enhances chiral recognition beyond traditional methods.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Chemical Sensing

Background:

  • Chiral recognition is crucial in pharmaceuticals and chemical industries.
  • Developing sensitive and selective chiral sensors remains a challenge.
  • Cyclodextrin derivatives are known for their chiral recognition capabilities.

Purpose of the Study:

  • To develop and evaluate a multi-transducer microsystem for chiral discrimination.
  • To investigate the role of cyclodextrin derivatives in chiral sensing.
  • To understand the underlying mechanisms of chiral analyte-receptor interactions.

Main Methods:

  • Incorporation of chiral cyclodextrin derivatives into a polysiloxane matrix.
  • Coating a three-transducer microsystem (calorimetric, mass-sensitive, capacitive) with the matrix.
  • Exposure of the coated sensors to chiral analytes like methyl lactate.
  • Analysis of sensor responses using a model combining Langmuir and Henry isotherms.

Main Results:

  • All three transducers exhibited distinct chiral discrimination of analytes.
  • Sensor signals resulted from a combination of sorption thermodynamics and transducer-specific effects.
  • Capacitive sensor showed molecular orientation effects, leading to opposite-sign signals for enantiomers.
  • A model involving Langmuir and Henry isotherms accurately described sensor response curves.

Conclusions:

  • Sensor techniques can elucidate enantioselective interactions between analytes and receptors/matrices.
  • The developed sensor system offers enhanced chiral discrimination compared to gas chromatography.
  • Transducer-specific contributions significantly improve chiral recognition capabilities.