Single-particle detection of native SARS-CoV-2 virions by microfluidic resistive pulse sensing

Varga, Zoltán and Madai, Mónika and Kemenesi, Gábor and Beke-Somfai, Tamás and Jakab, Ferenc (2022) Single-particle detection of native SARS-CoV-2 virions by microfluidic resistive pulse sensing. COLLOIDS AND SURFACES B: BIOINTERFACES. ISSN 0927-7765

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Abstract

Microfluidic resistive pulse sensing (MRPS) was used to determine the size –distribution of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) based on detecting nearly 30,000 single virions. However, the ultrastructure of SARS-CoV-2 is thoroughly described, but ensemble properties of SARS-CoV-2, e.g., its particle size distribution, are sparsely reported. According to the MRPS results, the size distribution of SARS-CoV-2 follows a log-normal function with a mean value of 85.1 nm, which corresponds to an approximate diameter of the viral envelope. This result also confirms the low number (< 50) of spike proteins on the surface of the virions.

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