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  • Quantifying local stiffness and forces in soft biological tissues using droplet optical microcavities [Elektronski vir]
    Pirnat, Gregor ...
    Mechanical properties of biological tissues fundamentally underlie various biological processes and noncontact, local, and microscopic methods can provide fundamental insights. Here, we present an ... approach for quantifying the local mechanical properties of biological materials at the microscale, based on measuring the spectral shifts of the optical resonances in droplet microcavities. Specifically, the developed method allows for measurements of deformations in dye-doped oil droplets embedded in soft materials or biological tissues with an error of only 1 nm, which in turn enables measurements of anisotropic stress inside tissues as small as a few pN/μm2. Furthermore, by applying an external strain, Young’s modulus can be measured in the range from 1 Pa to 35 kPa, which covers most human soft tissues. Using multiple droplet microcavities, our approach could enable mapping of stiffness and forces in inhomogeneous soft tissues and could also be applied to in vivo and single-cell experiments. The developed method can potentially lead to insights into the mechanics of biological tissues.
    Source: Proceedings of the National Academy of Sciences of the United States of America [Elektronski vir]. - ISSN 1091-6490 (Vol. 121, iss. 4, [article no.] e2314884121, Jan. 2024, str. 1-9)
    Type of material - e-article ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 184581379

    Link(s):

    https://www.pnas.org/doi/10.1073/pnas.2314884121
    DOI

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