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Related Experiment Video

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ASu@MNPs-based electrochemical immunosensor for vitamin D3 serum samples analysis.

Francesca Polli1, Cristine D'Agostino1, Rosaceleste Zumpano1

  • 1Department of Chemistry and Drug Technologies, Sapienza University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy.

Talanta
|August 6, 2022
PubMed
Summary

A novel electrochemical immunosensor detects Vitamin D3 (25-OHD3) in serum without pretreatment. This sensitive, label-free method offers a potential point-of-care test for monitoring Vitamin D deficiency.

Keywords:
Differential pulse voltammetryGold-magnetic nanoparticlesLabel-free immunosensorVitamin D(3) detection

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Analytical Chemistry

Background:

  • Vitamin D deficiency (hypovitaminosis D) is a global health concern.
  • Accurate and accessible detection of Vitamin D3 (25-OHD3) is crucial for monitoring and management.
  • Existing diagnostic methods can be complex or require sample pretreatment.

Purpose of the Study:

  • To develop a sensitive and label-free electrochemical immunosensor for direct detection of 25-OHD3 in human serum.
  • To optimize the immunosensor construction and evaluate its performance characteristics.
  • To validate the immunosensor's efficacy against a standard clinical assay.

Main Methods:

  • Modification of a graphite screen-printed electrode (SPE) with cysteamine (CYM)-functionalized core-shell magnetic nanoparticles (Au@MNPs).
  • Immobilization of 25-OHD3 antibody (AbD) onto the modified electrode surface using glutaraldehyde crosslinking.
  • Electrochemical detection using differential pulse voltammetry (DPV) to monitor sensor fabrication and analyze samples.
  • Validation using untreated human serum samples and comparison with the chemiluminescence-immunoassay (CLIA) method.

Main Results:

  • The developed immunosensor demonstrated high sensitivity with a limit of detection (LOD) of 2.4 ng/mL.
  • A linear detection range for 25-OHD3 was established between 7.4 and 70 ng/mL.
  • Results obtained from the immunosensor showed excellent agreement with the established CLIA reference method.

Conclusions:

  • The label-free electrochemical immunosensor provides a sensitive and reliable method for 25-OHD3 detection in untreated serum.
  • The sensor's performance suggests its potential utility as a point-of-care testing (POCT) device for hypovitaminosis D monitoring.
  • This approach offers a promising alternative for routine clinical assessment of Vitamin D status.