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Surface plasmon resonance-based immunoassay for human fetuin A.

S K Vashist1, E M Schneider, J H T Luong

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This summary is machine-generated.

A novel surface plasmon resonance (SPR) immunoassay (IA) offers a rapid and cost-effective method for detecting human fetuin A (HFA), a key biomarker for atherosclerosis and liver cancer.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biochemistry

Background:

  • Human fetuin A (HFA) is a significant biomarker for atherosclerosis and hepatocellular carcinoma.
  • Accurate and sensitive detection of HFA is crucial for early diagnosis and monitoring of these diseases.
  • Existing immunoassay methods may lack the required sensitivity, speed, or cost-effectiveness.

Purpose of the Study:

  • To develop a highly sensitive and rapid surface plasmon resonance (SPR)-based immunoassay (IA) for human fetuin A (HFA).
  • To establish a novel and simplified antibody immobilization technique for enhanced assay performance and reusability.
  • To validate the developed SPR IA for HFA detection in biological samples like blood and plasma.

Main Methods:

  • A novel antibody immobilization strategy using 3-aminopropyltriethoxysilane (APTES) on a gold-coated SPR chip.
  • Dispensing and incubation of anti-HFA capture antibody on the prepared SPR chip.
  • Detection of HFA using the developed SPR IA and comparison with ELISA for validation.

Main Results:

  • The SPR IA demonstrated high sensitivity for HFA detection, with a limit of detection of 0.7 ng mL⁻¹ and sensitivity of 1 ng mL⁻¹ within the 0.3-20 ng mL⁻¹ range.
  • The simplified antibody immobilization procedure was 5-fold faster than conventional methods and ensured leach-proof antibody binding.
  • The SPR chip exhibited excellent reusability and stability, retaining 82% activity after 4 months of storage.
  • SPR IA results for HFA in diluted human whole blood and plasma showed good agreement with a commercial ELISA kit.

Conclusions:

  • The developed SPR-based immunoassay provides a highly sensitive, rapid, and cost-effective method for HFA detection.
  • The novel antibody immobilization technique enhances assay efficiency and allows for chip reusability, reducing costs.
  • This SPR IA is a promising tool for the clinical diagnosis and monitoring of atherosclerosis and hepatocellular carcinoma.