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. 2024 Apr 12;22:166. doi: 10.1186/s12951-024-02434-3

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© The Author(s) 2024

Open Access This 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 — Preparation and characterization of the oral YBNs@PDA. (A) Synthesis route of YBNs@PDA. (B) TEM and SEM images of YBNs@PDA. (C) Size distribution of YBNs and YBNs@PDA. (D) Zeta potential of YBNs, YBNs@PDA and YBNs@PDA in gastric fluid for 24 h. (E) FT-IR spectrum of PDA, YBNs and YBNs@PDA. (F) TGA spectra of YBNs, PDA and YBNs@PDA. (G) X-ray photoelectron spectroscopy (XPS) spectra of YBNs, PDA and YBNs@PDA. (H) Fluorescence spectra of YBNs@PDA labeled with FITC. (I) Hydrodynamic diameter changes of YBNs@PDA in simulated gastric fluid