Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2016 Feb 1;183(2):611-616.
doi: 10.1007/s00604-015-1685-3. Epub 2015 Dec 7.

Quantum Dot-Modified Paper-Based Assay for Glucose Screening

Gema M Durán  1 , Tomás E Benavidez  2 , Ángel Ríos  3 , Carlos D García  2
Affiliations

Quantum Dot-Modified Paper-Based Assay for Glucose Screening

Gema M Durán et al. Mikrochim Acta. .

Abstract

A simple and inexpensive method to fabricate a colloidal CdSe/ZnS quantum dots-modified paper-based assay for glucose is herein reported. The circular paper sheets were uniformly loaded and displayed strong fluorescence under a conventional hand-held UV lamp (365 nm). The assay is based on the use of glucose oxidase enzyme (GOx), which impregnated the paper sheets, producing H2O2 upon the reaction with the glucose contained in the samples. After 20 min of exposure, the fluorescence intensity changed due to the quenching caused by H2O2. To obtain a reading, the paper sheets were photographed under 365 nm excitation using a digital camera. Several parameters, including the amount of QD, sample pH, and amount of GOx were optimized to maximize the response to glucose. The paper-based assay showed a sigmoidal-shaped response with respect to the glucose concentration in the 5-200 mg·dL-1 range (limit of detection of 5 μg·dL-1), demonstrating their potential use for biomedical applications.

Keywords: Quantum dots; glucose; paper-based assay.

PubMed Disclaimer

Figures

Figure 1
Figure 1
(A) UV-visible absorption and fluorescence spectra of 0.3 μmol·dL−1 CdSe/ZnS QD in chloroform
Figure 2
Figure 2
Transmission electron microscopy images of CdSe/ZnS QD.
Figure 3
Figure 3
Quenching effects of QD towards different concentrations of glucose (A), and first derivative of the initial data showing the capability of the method to be used as a screening method for glucose (B). Lines included to guide the eye.
Figure 3
Figure 3
Quenching effects of QD towards different concentrations of glucose (A), and first derivative of the initial data showing the capability of the method to be used as a screening method for glucose (B). Lines included to guide the eye.
See this image and copyright information in PMC

References

    1. Duong HD, Rhee JI. Use of CdSe/ZnS core-shell quantum dots as energy transfer donors in sensing glucose. Talanta. 2007;73(5):899–905. - PubMed
    1. Durán GM, Contento AM, Ríos Á. Use of Cdse/ZnS quantum dots for sensitive detection and quantification of paraquat in water samples. Anal Chim Acta. 2013;801(0):84–90. - PubMed
    1. Durán GM, Plata MR, Zougagh M, Contento AM, Ríos Á. Microwave-assisted synthesis of water soluble thiol capped CdSe/ZnS quantum dots and its interaction with sulfonylurea herbicides. J Colloid Interf Sci. 2014;428(0):235–241. - PubMed
    1. Durán GM, Contento AM, Ríos Á. β-Cyclodextrin coated CdSe/ZnS quantum dots for vanillin sensoring in food samples. Talanta. 2015;131(0):286–291. - PubMed
    1. Bhakta SA, Borba R, Taba M, Jr, Garcia CD, Carrilho E. Determination of nitrite in saliva using microfluidic paper-based analytical devices. Anal Chim Acta. 2014;809(0):117–122. - PMC - PubMed

LinkOut - more resources