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Quantum Dot-Modified Paper-Based Assay for Glucose Screening.
Gema M Durán1, Tomás E Benavidez2, Ángel Ríos3
1Department of Analytical Chemistry, University of Castilla - La Mancha, Avenue Camilo José Cela s/n, Ciudad Real 13004, Spain; IRICA (Regional Institute of Applied Scientific Research), Avenue Camilo José Cela s/n, Ciudad Real 13004, Spain.
Mikrochimica Acta
|April 9, 2016
Summary
This study presents a low-cost paper-based assay using quantum dots for glucose detection. The assay utilizes fluorescence quenching by hydrogen peroxide, offering a simple method for biomedical applications.
Area of Science:
- Materials Science
- Analytical Chemistry
- Biomedical Engineering
Background:
- Quantum dots (QDs) offer unique optical properties for biosensing.
- Paper-based assays provide a low-cost, portable platform for diagnostics.
- Accurate glucose monitoring is crucial for managing diabetes.
Purpose of the Study:
- To develop a simple, inexpensive, and sensitive paper-based assay for glucose detection.
- To utilize colloidal cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots for enhanced fluorescence.
- To establish a method for quantifying glucose in biomedical samples.
Main Methods:
- Fabrication of paper sheets uniformly loaded with CdSe/ZnS quantum dots.
- Impregnation of paper sheets with glucose oxidase (GOx) enzyme.
- Utilizing the hydrogen peroxide (H2O2) produced by GOx to quench QD fluorescence.
- Quantification of glucose by measuring fluorescence intensity changes under UV excitation (365 nm).
- Optimization of assay parameters including QD amount, sample pH, and GOx concentration.
Main Results:
- The paper-based assay exhibited strong fluorescence under UV light.
- A sigmoidal response curve was observed for glucose concentrations ranging from 5 to 200 mg·dL⁻¹.
- A low limit of detection (LOD) of 5 μg·dL⁻¹ was achieved.
- Optimized parameters enhanced the assay's sensitivity and response to glucose.
Conclusions:
- The developed CdSe/ZnS quantum dot-modified paper-based assay is a cost-effective and simple method for glucose detection.
- The assay demonstrates significant potential for use in point-of-care diagnostic and biomedical applications.
- This approach offers a promising alternative to existing glucose monitoring techniques.
