4.7 Article

Protein-Bound Uremic Toxins Quantification by a Colorimetric Sensor Based on the Oxidation of Silver Nanoparticles

Journal

IEEE SENSORS JOURNAL
Volume 21, Issue 20, Pages 22651-22660

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3109567

Keywords

Nanoparticles; Sensors; Silver; Proteins; Oxidation; Hydrogen; Temperature measurement; AgNPs; BSA; quantification; PBUTs; chronic kidney disease

Funding

  1. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
  2. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brazil (CAPES) [001]
  3. Financiadora de Inovacao e Pesquisa (FINEP)
  4. Fundacao Araucaria

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This study presents a colorimetric sensor based on albumin bound to citrate-capped silver nanoparticles for detecting protein-bound uremic toxins, such as indoxyl sulfate and p-cresylsulfate. The sensor method exhibits a linear response and allows for distinguishing between normal and uremic blood concentrations of toxins, reducing analysis costs. The interaction between albumin and citrate-capped silver nanoparticles was also investigated through Raman spectroscopy.
This work shows a colorimetric sensor based on albumin bound to citrate-capped silver nanoparticles. The sensor capability of detecting protein-bound uremic toxins, such as indoxyl sulfate and p-cresylsulfate, is demonstrated. These uremic toxins enhance the oxidation of citrate-capped silver nanoparticles by hydrogen peroxide, affecting the localized surface plasmon resonance and allowing the proposed colorimetric sensing method. The method exhibits a linear response for indoxyl sulfate and p-cresylsulfate concentrations ranging from 15 to 100 mg/L with resolutions of 0.56 mg/L and 0.41 mg/L and expanded uncertainties for a confidence level of 95% of 17.23 mg/L and 12.55 mg/L, respectively. Limits of detection and quantification of 5.7 mg/L and 19 mg/L for indoxyl sulfate and of 3.2 mg/L and 10.7 mg/L for p-cresylsulfate were obtained for p < 0.05. These characteristics of the colorimetric method allow for a distinction between total normal and total uremic blood concentrations, which reported levels are (0.54 +/- 4.00) mg/L and (37.07 +/- 26.50) mg/L for indoxyl sulfate and (1.87 +/- 2.31) mg/L and (23.00 +/- 16.90) mg/L for p-cresylsulfate. Besides, this novel sensor significantly reduces costs of analysis and facilitates the quantification of those toxins. The interaction between albumin and citrate-capped silver nanoparticles was also investigated by Raman spectroscopy.

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