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Updated: May 26, 2026

A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis
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SEC Purified Monomeric Aβ42 Produces Reproducible and Reliable Aggregation Measurements.

Jhinuk Saha1,2, Joshua Dindinger1,2, Ayyalusamy Ramamoorthy1,2,3

  • 1Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, 2525 Pottsdamer St., Tallahassee, FL 32310, United States.

Biorxiv : the Preprint Server for Biology
|May 25, 2026
PubMed
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This summary is machine-generated.

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Size-exclusion chromatography (SEC) is crucial for preparing pure monomeric amyloid-beta 42 (Aβ42), essential for Alzheimer's disease (AD) research. This method ensures reproducible aggregation studies, unlike chemical denaturation alone.

Area of Science:

  • Biochemistry
  • Neuroscience
  • Molecular Biology

Background:

  • Amyloid-beta (Aβ) plaque accumulation is a key feature of Alzheimer's disease (AD).
  • Aβ42 is the most aggregation-prone Aβ isoform, making its monomeric preparation critical for studying aggregation.
  • Understanding Aβ42 aggregation kinetics is vital for developing AD therapeutics.

Purpose of the Study:

  • To compare size-exclusion chromatography (SEC) with chemical denaturation for monomerizing recombinant Aβ42.
  • To evaluate the impact of different monomer preparation methods on Aβ42 aggregation.
  • To establish standardized protocols for reliable Aβ42 aggregation studies.

Main Methods:

  • Recombinant Aβ42 production in E. coli, purification via urea solubilization and HPLC.
Keywords:
AggregationAmyloidsMonomersSEC

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  • Monomerization using SEC versus chemical denaturation (NaOH, NH₄OH).
  • Assessment of monomer purity and aggregation kinetics using Thioflavin T (ThT) fluorescence, Transmission Electron Microscopy (TEM), and Nuclear Magnetic Resonance (NMR) spectroscopy.

    • Main Results:

    • SEC-isolated Aβ42 monomers showed sigmoidal aggregation kinetics, indicative of controlled secondary nucleation.
    • Non-SEC preparations contained pre-existing aggregates, leading to impaired aggregation and attenuated NMR signals.
    • NaOH denaturation resulted in flat ThT curves, while NH₄OH showed extended lag phases, with NH₄OH performing better due to gentler pH neutralization.
    • Higher initial peptide concentrations correlated with increased fibril yields.

    Conclusions:

    • SEC is essential for obtaining highly pure monomeric Aβ42, significantly improving the reproducibility of aggregation assays.
    • Standardized monomer preparation protocols are critical for advancing Alzheimer's disease research.
    • The findings underscore the importance of monomer quality in studying Aβ42 aggregation mechanisms.