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Modifications of the PAMONO-Sensor Help to Size and Quantify Low Number of Individual Biological and Non-Biological Nano-Particles
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1  Leibniz Institut für Analytische Wissenschaften-ISAS-e.V.; Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany

https://doi.org/10.3390/I3S2021Dresden-10136 (registering DOI)
Abstract:

In the series of recently published works, we demonstrated that plasmon assisted microscopy of nano-objects (PAMONO) technique can be successfully employed for the sizing and quantification of single viruses, virus-like particles, microvesicles and charged non-biological particles. This approach enables label-free, but specific detection of biological nano-vesicles. Hence, the sensor, which was built up utilizing plasmon-assisted microscopy, possesses relative versatility and it can be used as a platform for cell-based assays. However, one of the challenging tasks for such a sensor was the ability to reach a homogeneous illumination of the whole surface of the gold sensor slide. Moreover, in order to enable the detection of even relatively low concentrations of nano-particles the focused image area had to be expanded. Both tasks were solved via modifications of previously described PAMONO-sensor set up. Taken together, our latest findings can help to develop a research and diagnostic platform based on the principles of the surface plasmon resonance (SPR)-assisted microscopy of nano-objects.

Keywords: surface plasmon resonance; virus-like particles; extracellular vesicles; liquid biopsies
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