Quantum dot-modified paper-based assay for glucose screening

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• 作者：Gema M. Durán ; Tomás E. Benavidez ; Ángel Ríos ; Carlos D. García
• 关键词：Quantum dots ; Paper ; based assay ; Glucose
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：183
• 期：2
• 页码：611-616
• 全文大小：716 KB
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• 作者单位：Gema M. Durán (1) (2)
  Tomás E. Benavidez (3)
  Ángel Ríos (1)
  Carlos D. García (3)
  
  1. Department of Analytical Chemistry and Food Technology, University of Castilla - La Mancha, Avenue Camilo José Cela s/n, 13004, Ciudad Real, Spain
  2. IRICA (Regional Institute of Applied Scientific Research), Avenue Camilo José Cela s/n, 13004, Ciudad Real, Spain
  3. Department of Chemistry, Clemson University, 219 Hunter Laboratories, Clemson, SC, 29634, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

The article describes a simple optical assay for glucose. It is based on the use of paper spots loaded with colloidal CdSe/ZnS quantum dots (Q-dots) and the enzyme glucose oxidase (GOx). Circular paper sheets were uniformly loaded with Q-dots and then displayed strong fluorescence under a UV lamp (365 nm exCitation). The action of GOx causes the production of H₂O₂ which, after a typical exposure time of 20 min, causes fluorescence intensity to be quenched. To obtain a reading, the paper sheets were photographed under 365 nm excitation using a digital camera. Several parameters, including the amount of Q-dots, 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.