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. 2021 Mar 5;497(1):81–85. doi: 10.1134/S1607672921020034

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© The Author(s) 2021, ISSN 1607-6729, Doklady Biochemistry and Biophysics, 2021, Vol. 497, pp. 81–85. © The Author(s), 2021. This article is an open access publication.Russian Text © The Author(s), 2021, published in Doklady Rossiiskoi Akademii Nauk. Nauki o Zhizni, 2021, Vol. 497, pp. 175–179.

Open Access.This article is distributed under the terms of the Creative Commons Attribution 4.0 International Public License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1. — (a) The structural formula of polysialic acid and the scheme for the modification of UCNPs with PSA. (b) Photoluminescence spectrum of UCNPs at an excitation wavelength of 975 nm and UCNPs, scale 50 nm. (c) IR-Fourier spectra after modification UCNP–PEI (top) and UCNP–PSA (bottom).