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Evanescent field-fiber loop ringdown glucose sensor.

Chuji Wang1, Malik Kaya, Charlotte Wang

  • 1Mississippi State University, Department of Physics and Astronomy, Starkville, Mississippi 39759, USA. cw175@msstate.edu

Journal of Biomedical Optics
|April 17, 2012
PubMed
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New evanescent field-fiber loop ringdown (EF-FLRD) glucose sensors offer high sensitivity and fast response. These biosensors demonstrate reliable glucose detection in solutions and synthetic urine, with potential for improved diagnostics.

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Optical Sensing

Background:

  • Evanescent field-fiber loop ringdown (EF-FLRD) is an emerging hybrid sensing technique.
  • Biosensors require high sensitivity, fast response, and low cost for effective diagnostics.

Purpose of the Study:

  • To develop and characterize novel fiber loop ringdown glucose sensors.
  • To investigate the sensing mechanism based on refractive index-difference evanescent field attenuation.
  • To evaluate sensor performance with and without immobilized glucose oxidase (GOD).

Main Methods:

  • Fabrication of sensor heads using partially-etched single mode fiber.
  • Immobilization of glucose oxidase (GOD) on the etched fiber surface.
  • Testing sensor response to glucose solutions and synthetic urines (50 mg/dl to 10 g/dl).

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Main Results:

  • Sensors exhibited linear response to glucose concentrations from 100 mg/dl to 1 g/dl.
  • Nonlinear response observed at higher glucose concentrations (1-10 g/dl).
  • Detection sensitivities of 75 mg/dl (glucose solutions) and 50 mg/dl (synthetic urine) were achieved with a sampling rate of 10-100 Hz.

Conclusions:

  • EF-FLRD glucose sensors show promise for sensitive and rapid glucose detection.
  • Theoretical sensitivity of 10 mg/dl suggests potential for detecting concentrations below the renal threshold.
  • Further development could lead to advanced diagnostic tools for glucose monitoring.