Fast Isolation of Highly Specific Population of Platelet-Derived Extracellular Vesicles From Blood Plasma by Affinity Monolithic Column, Immobilized With Anti-human CD61 Antibody

Evgen Multia, Crystal Jing Ying Tear, Mari Palviainen, Pia Siljander, Marja-Liisa Riekkola

Analytica Chimica Acta (2019), Volume 1091

A new, fast and selective immunoaffinity chromatographic method including a methacrylate-based convective interaction media (CIM®) disk monolithic column, immobilized with anti-human CD61 antibody, was developed for the isolation of CD61-containing platelet-derived extracellular vesicles (EVs) from plasma. The isolated EVs were detected and size characterized by asymmetrical flow field-flow fractionation (AsFlFFF) with multi-angle light-scattering (MALS) and dynamic light-scattering (DLS) detection, and further confirmed by nanoparticle tracking analysis (NTA) and transmission electron microscopy (TEM). The isolation procedure took only 19 min and the time can be even further decreased by increasing the flow rate. The same immunoaffinity chromatographic procedure, following AsFlFFF allowed also the isolation and characterization of platelet-derived EVs from plasma in under 60 min. Since it is possible to regenerate the anti-CD61 disk for multiple uses, the methodology developed in this study provides a viable substitution and addition to the conventional EV isolation procedures.