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An In Situ Study on Nanozyme Performance to Optimize Nanozyme-Strip for Aβ Detection.

Yaying Luo1,2, Haiming Luo3, Sijia Zou2,4

  • 1School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.

Sensors (Basel, Switzerland)
|April 13, 2023
PubMed
Summary

This study optimized nanozyme-strips by evaluating nanozyme properties like dispersity and membrane migration. Cobalt iron oxide (CoFe2O4) nanozymes demonstrated superior performance for sensitive detection, improving point-of-care testing (POCT).

Keywords:
Aβ detectionNC membranein situ characterizationnanozyme-stripperoxidase-like activity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Nanozyme-strips represent a novel point-of-care testing (POCT) technology utilizing nanozyme catalytic activity for signal amplification and high-sensitivity detection.
  • Previous research primarily focused on enhancing nanozyme activity, neglecting other critical physicochemical factors influencing nanozyme-strip performance.
  • Understanding these factors is crucial for optimizing nanozyme-strip technology beyond conventional colloidal gold strips.

Purpose of the Study:

  • To investigate the impact of nanozyme size and type on nanozyme-strip performance.
  • To identify key physicochemical factors influencing the detection capabilities of nanozyme-strips.
  • To optimize nanozyme-strip design for highly sensitive detection of specific targets.

Main Methods:

  • Synthesized and evaluated three sizes of iron oxide (Fe3O4) and cobalt iron oxide (CoFe2O4) nanozymes.
  • Assessed nanozyme dispersity in aqueous solutions and migration behavior on nitrocellulose (NC) membranes.
  • Determined peroxidase-like activity and optimized nanozyme probe for sensitive detection of amyloid-beta 42 oligomers (Aβ42Os).

Main Results:

  • Fe3O4 nanozymes aggregated at the bottom of the NC membrane, while CoFe2O4 nanozymes exhibited smooth migration.
  • CoFe2O4 nanozymes showed better dispersity and significant color development on the NC membrane.
  • Smaller CoFe2O4 nanozymes (55 ± 6 nm) migrated effectively and enabled highly sensitive Aβ42Os detection.

Conclusions:

  • Nanozyme properties such as dispersity, NC membrane migration, and peroxidase-like activity are critical for nanozyme-strip optimization.
  • CoFe2O4 nanozymes are promising candidates for developing advanced nanozyme-strips due to their superior characteristics.
  • Comprehensive evaluation of these factors is essential for successful application of nanozymes in POCT devices.