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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation

Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation

Published on: September 19, 2017

Glucose sensor using liquid-crystal droplets made by microfluidics.

Jiyeon Kim¹, Mashooq Khan, Soo-Young Park

¹Department of Polymer Science and Engineering, Kyunpook National University , #1370 Sangyuk-dong, Buk-gu, Daegu 702-701, Korea.

ACS Applied Materials & Interfaces

|November 21, 2013

Summary

This summary is machine-generated.

A novel liquid-crystal (LC) droplet biosensor detects glucose with high sensitivity and selectivity. This cost-effective sensor offers rapid, naked-eye detection for potential human glucose level prescreening.

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Area of Science:

Biomedical Engineering
Materials Science
Analytical Chemistry

Background:

Glucose detection is crucial for managing diabetes and other metabolic disorders.
Existing biosensors often face challenges with sensitivity, selectivity, cost, or complexity.
Liquid crystals (LCs) offer unique optical properties that can be exploited for sensing applications.

Purpose of the Study:

To develop a novel, sensitive, and selective glucose biosensor using functionalized liquid-crystal droplets.
To investigate the detection mechanism based on LC droplet configuration changes.
To evaluate the sensor's performance in terms of sensitivity, response time, and selectivity.

Main Methods:

Fabrication of micrometer-sized 4-cyno-4-pentylbiphenyl (5CB) droplets coated with poly(acrylicacid-b-4-cynobiphenyl-4-oxyundecylacrylate) (PAA-b-LCP).
Covalent immobilization of glucose oxidase (GOx) onto the PAA chains of the LC droplet surface.
Detection of glucose via changes in LC droplet configuration (radial to bipolar) observed using polarized optical microscopy.
Assessment of sensor selectivity by testing against galactose.

Main Results:

The functionalized LC droplet biosensor successfully detected glucose in an aqueous medium.
Achieved a low detection limit of 0.03 mM with a rapid response time of approximately 3 minutes.
Demonstrated selective detection of glucose over galactose.
Observed configurational changes in the LC droplets under polarized light microscopy.

Conclusions:

A new, sensitive, and selective liquid-crystal droplet-based glucose biosensor has been successfully developed.
The sensor exhibits low production cost and enables easy, naked-eye detection.
This biosensor holds potential for prescreening glucose levels in the human body.