Antibacterial fibers have great potential in numerous applications, including bandages, surgical robes, and surgical sutures, and play a significant role in our everyday lives. Here, zeolitic imidazolate framework-67 was synthesized using a green method on silk fibers through a layer-by-layer process under ultrasonic irradiation (ZIF-67@silk [U]) and without ultrasonic irradiation (ZIF-67@silk [B]). Then, iodine was loaded on ZIF-67@silk samples and were assessed as antibacterial fibers with iodine release. Four samples of ZIF-67@silk and I₂@ZIF-67@silk were characterized by FT-IR, PXRD, FE-SEM, TGA, BET, and UV–Vis spectroscopy. Finally, antibacterial activity of ZIF-67@silk (B and U) and I₂@ZIF-67@silk (B and U) on Staphylococcus aureus as Gram-positive bacteria and Escherichia coli as Gram-negative bacteria was investigated. In addition to ZIF-67@silk samples, iodine-loaded samples showed excellent antimicrobial facility.

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Figure S1. FT-IR spectra for a) silk fiber and b) silk fiber (is activated).

Figure S2. EDS map of element distribution in the ZIF-67@silk (B).

Figure S3. EDS map of element distribution in the ZIF-67@silk (U).

Figure S4. EDS map of element distribution in the I₂@ZIF-67@silk (B).

Figure S5. EDS map of element distribution in the I₂@ZIF-67@silk (U).

Figure S6. FE-SEM images of a) the virginal silk fibers and b) silk fiber after NaOH treatment.

Figure S7. FE-SEM images of a) ZIF-67@silk (B), b) ZIF-67@silk (U), c) I₂@ZIF-67@silk (B) and d) I₂@ZIF-67@silk (U).

Figure S8. a) Color change photograph of silk fiber has been soaked in I₂ cyclohexane solution (3 ml, 0.005 mol $L^{- 1}$ ) and b) The UV/Vis spectra of silk fiber for the release process of iodine.

Figure S9. Inhibition zone of ZIF-67@silk (B), ZIF-67@silk (U), I₂@ZIF-67@silk (B), and I₂@ZIF-67@silk (U) against S. aureus (A) and E. coli (B).

Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

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Volume37, Issue1

January 2023

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Loading of ZIF-67 on silk with sustained release of iodine as biocompatible antibacterial fibers

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Loading of ZIF-67 on silk with sustained release of iodine as biocompatible antibacterial fibers

Abstract

Open Research

DATA AVAILABILITY STATEMENT

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