Abstract
Spectroscopic approaches are very good to noninvasively determine the most significant indicators of the tissue state. Indocyanine green (ICG) is a well-known fluorescent dye approved for clinical applications, which has a short circulation time in the vascular system and low photostability. At high temperatures the molecular solution of the photosensitizer self-assembles into a stable J-aggregate form of ICG nanoparticles (ICG NPs) with the absorption peak in the near-infrared range. Investigation of ICG NP stability in human blood and plasma using a fiber-spectroscopic system demonstrates no difference in absorption properties and different dependence of the integrated fluorescence ratio between ICG monomers and J-aggregates in blood and plasma. Transition of ICG NP aggregates to the monomeric form in human blood plasma results in a higher circulation time of the fluorescent dye in the vascular system. High stability of aggregates and a low elimination rate may increase efficiency of fluorescent diagnostics of near-tumor tissues.
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Funding
The research was performed within the State Assignment for conducting research under Government contract in 2019–2021 (theme no. 0723-2020-0035 “New phenomena in interaction of laser radiation, plasma, and particle and radiation fluxes with condensed matter as a basis of innovative technologies”) and supported in part by the Russian Foundation for Basic Research, project no. 18-29-01062.
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Translated by M. Potapov
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Farrakhova, D.S., Romanishkin, I.D., Yakovlev, D.V. et al. The Spectroscopic Study of Indocyanine Green J-Aggregate Stability in Human Blood and Plasma. Phys. Wave Phen. 30, 86–90 (2022). https://doi.org/10.3103/S1541308X22020029
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DOI: https://doi.org/10.3103/S1541308X22020029