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Miniaturization of EISCAP sensor for triglyceride detection.

Hareesh Vemulachedu1, Renny Edwin Fernandez, Enakshi Bhattacharya

  • 1Microelectronics and MEMS Laboratory, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India. enakshi@ee.iitm.ac.in

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This study presents miniaturized triglyceride biosensors using electrolyte insulator semiconductor capacitors (mini-EISCAPs) on silicon substrates. These novel biosensors efficiently detect triglyceride hydrolysis by measuring pH changes, offering rapid reaction rates.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Triglyceride detection is crucial for diagnosing metabolic disorders.
  • Existing biosensor technologies face limitations in miniaturization and sensitivity.
  • Electrolyte Insulator Semiconductor Capacitors (EISCAPs) offer a promising platform for biosensing applications.

Purpose of the Study:

  • To fabricate and characterize miniaturized triglyceride biosensors on crystalline and porous silicon substrates.
  • To evaluate the performance of these novel mini-EISCAP biosensors for triglyceride detection.
  • To investigate the effect of miniaturization on reaction rates.

Main Methods:

  • Fabrication of mini-EISCAPs using bulk micromachining on silicon substrates.
  • Immobilization of lipase enzyme onto the sensor surface for triglyceride hydrolysis.
  • Characterization using Capacitance-Voltage (C-V) measurements to monitor pH variations.
  • Utilizing silicon nitride as the pH-sensitive dielectric layer.

Main Results:

  • Successful fabrication of miniaturized EISCAP biosensors with dimensions of 1,500 microm x 1,500 microm x 100 microm.
  • Demonstrated detection of triglyceride hydrolysis via butyric acid production and subsequent pH change.
  • Observed significantly higher reaction rates in miniaturized sensor cells compared to larger dimensions.
  • Monitoring of flatband voltage shifts in C-V characteristics accurately indicated pH changes.

Conclusions:

  • Miniaturized EISCAP biosensors are effective for sensitive and rapid triglyceride detection.
  • The employed fabrication technique and materials are suitable for creating high-performance biosensors.
  • Miniaturization enhances reaction kinetics, leading to faster and more efficient biosensing.
  • These biosensors hold potential for point-of-care diagnostics and metabolic monitoring.