Ng extracellular vesicles within a reproducible and trusted manner is difficult resulting from their little size (exosomes variety from 30 to 100 nm in diameter). Extracellular vesicle analysis can be accomplished utilizing high-magnification microscopy; having said that, this strategy has a extremely low throughput. Attempts to analyse extracellular vesicles applying regular PMT primarily based flow cytometers has been hampered by the limit of detection of such tiny particles and their low refractive index. To overcome these limitations, we’ve got employed the Amnis imaging technology which has the benefit of HDAC5 Inhibitor manufacturer higher throughput flow cytometry with larger sensitivity to modest particles resulting from the CCD based, timedelay-integration image capturing technique. Solutions: Exosomes have been purchased or obtained from different sources, stained with a number of labelled monoclonal antibodies and quantified by CCD-based flow cytometry. Sensitivity is calculated by standardizing every single instrument to MESF standards. Final results: Data might be presented working with the Amnis imaging technology to immunophenotype extracellular vesicles derived from distinct sources. Techniques to optimize detection of extracellular vesicles may also be discussed. Summary/Conclusion: Amnis imaging technologies is in a position to detect and phenotype exosomes with extremely higher sensitivity.Solutions: Four damaging staining protocols had been selected from literature, which differ in fixation of the EV sample and mounting of EVs to a TEM grid. These protocols were applied to a single sample of cell-free human urine. Images were taken at 1 chosen image place and 5 predefined places with the grids. The obtained photos were compared for their qualitative and quantitative usefulness with respect to: morphology, EV count and high quality from the obtained TEM images. Final results: EVs have been detectable by all 4 protocols. Nonetheless, at predefined locations, the EV recovery varied by twofold between protocols. Evaluation of image top quality by four different researchers active within the EV field demonstrated a distinction in image quality and suitability for EV study. Summary/Conclusion: EV sample preparation protocols have a substantial influence on the TEM image excellent. The sample protocol devoid of fixation, carbon coated grids, blotting following sample mounting and quick incubation with uranyl acetate was preferable over the other evaluated protocols determined by numerical evaluation and overall image good quality. Funding: This work is supported by The Netherlands Organisation for Scientific Research Domain Applied and Engineering Sciences (NOWTTW), research programs VENI 13681 (Frank Coumans) and HIV-1 Activator Gene ID Perspectief CANCER-ID 14198 (Linda Rikkert).PS09.Co-localization, counting and size characterization of single exosomes making use of a direct from sample surface capture primarily based imaging method George Daaboul; Gabriel Reznik; Aditya Dhande; Amit Deliwala; David Freedman nanoView Biosciences, Boston, USAPS09.17 = OWP2.Improvement of higher sensitivity flow cytometry for sizing and molecular profiling of person extracellular vesicles down to 40 nmPS09.Characterization of extracellular vesicles by transmission electron microscopy: comparison of damaging staining protocols Linda Rikkert1; Leon Terstappen2; Rienk Nieuwland3; Frank A.W. Coumans1 Department of Healthcare Cell Biophysics, University of Twente, Enschede, The Netherlands, Amsterdam, The Netherlands; 2Department of Health-related Cell BioPhysics, University of Twente, Enschede, The Netherlands, Enschede, The Netherlands; 3Laboratory of Experimental C.