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Related Concept Videos

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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Fully Automated Centrifugal Microfluidic Device for Ultrasensitive Protein Detection from Whole Blood
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Ultra-sensitive microfibre absorption detection in a microfluidic chip.

Lei Zhang1, Pan Wang, Yao Xiao

  • 1State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou, 310027, China. zhang_lei@zju.edu.cn

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|September 28, 2011
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Summary
This summary is machine-generated.

This study presents a novel microfibre absorption sensor for highly sensitive and reversible detection of methylene blue and bovine serum albumin. The sensor achieves ultra-low detection limits, requiring minimal sample volume and light power for biological specimen analysis.

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Area of Science:

  • Optoelectronics
  • Biomedical Engineering
  • Chemical Sensing

Background:

  • Microfibre-based sensors offer potential for high-sensitivity detection.
  • Existing methods may require larger sample volumes or higher power.
  • Need for sensitive, low-volume detection methods in biological analysis.

Purpose of the Study:

  • To develop and characterize a microfibre absorption sensor for chemical and biological analytes.
  • To evaluate the sensor's sensitivity, reversibility, and sample volume requirements.
  • To demonstrate the sensor's applicability for detecting biologically relevant molecules.

Main Methods:

  • Fabrication of a silica microfibre embedded in a microchannel.
  • Measurement of methylene blue absorbance using the microfibre sensor.
  • Application of the sensor for bovine serum albumin quantification.
  • Assessment of sensor performance including detection limit and reversibility.

Main Results:

  • Achieved a detection limit of 50 pM for methylene blue with excellent reversibility (0-5 nM range).
  • Demonstrated a detection limit of 10 fg mL(-1) for bovine serum albumin.
  • Required only 500 nL sample volume and 150 nW probing light power.
  • Sensor shows promise for single or few-molecule detection of biological specimens.

Conclusions:

  • The developed microfibre absorption sensor exhibits high sensitivity and reversibility.
  • Low sample volume and power requirements make it suitable for sensitive biological detection.
  • This technology holds significant potential for analyzing trace amounts of biological molecules safely.