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The study focuses on developing methods to detect and analyze Aβ42 aggregates at the single molecule level using track-etched nanopore membranes.
Two functionalization strategies were tested: a simpler three-step aptamer method and a more complex six-step Lecanemab antibody method, with the latter proving more effective for quick detection.
The research concluded that combining chromatographic membranes with an ionic diode enhances the ability to identify rare biomarkers, facilitating the analysis of larger Aβ42 aggregates.
Article Abstract
In this work, we aim to capture, detect and analysis at single molecule level Aβ42 aggregates. To this end, two strategies of track-etched nanopore membranes functionalization were investigated. The first one uses an aptamer and requires only three steps, whereas the second strategy uses Lecanemab antibodies and requires six steps. Out of the two presented strategies, the second one was found to be the most suitable to detect Aβ42 aggregates using a quick current-voltage readout. The resulting single nanopore was then upscale to multipore membranes to capture the Aβ42 aggregates before analysis through them through a single-molecule approach. By comparing the species present in the retentate and filtrate, we confirmed the membrane's affinity for the larger Aβ42 aggregates present in the sample. We found that chromatographic membranes combined with an ionic diode for binary on/off readout are powerful tools for detecting rare biomarkers before single molecule analysis.
