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. 2022 Nov 9;26:62. doi: 10.1186/s40824-022-00304-3

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — (a) Scheme of the SF-EGCG conjugate formation through autoxidation of EGCG at basic pH 7.4 and subsequent conjugation reaction of EGCG quinone with a lysine residue of SF-WS. (b) UV-visible spectra of SF-WS and SF-EGCG solutions at an equal concentration (50 µg/mL). (c) Optimization of EGCG feeding amount and reaction time. Absorbance at 274 nm of SF-EGCG conjugates formed at various reaction time (feeding amount of EGCG = 40 µmol) and various feeding amounts of EGCG (reaction time = 4 h). (d) Fluorescence intensity (λ_ex = 390 nm, λ_em = 515 nm) of SF-WS and SF-EGCG solutions on primary amine content after 1 min of reaction with fluorescamine assay reagent (n = 8)