Characterization of epigallocatechin-gallate-grafted chitosan nanoparticles and evaluation of their antibacterial and antioxidant potential

María J. Moreno-Vásquez, Maribel Plascencia-Jatomea*, Saúl Sánchez-Valdes, Judith C. Tanori-Córdova, Francisco J. Castillo-Yañez, Idania E. Quintero-Reyes, Abril Z. Graciano-Verdugo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Nanoparticles based on chitosan modified with epigallocatechin gallate (EGCG) were syn-thetized by nanoprecipitation (EGCG-g-chitosan-P). Chitosan was modified by free-radical-induced grafting, which was verified by Fourier transform infrared (FTIR). Furthermore, the morphology, par-ticle size, polydispersity index, and zeta potential of the nanoparticles were investigated. The grafting degree of EGCG, reactive oxygen species (ROS) production, antibacterial and antioxidant activities of EGCG-g-chitosan-P were evaluated and compared with those of pure EGCG and chitosan nanoparticles (Chitosan-P). FTIR results confirmed the modification of the chitosan with EGCG. The EGCG-g-chitosan-P showed spherical shapes and smoother surfaces than those of Chitosan-P. EGCG content of the grafted chitosan nanoparticles was 330 µg/g. Minimal inhibitory concentration (MIC) of EGCG-g-chitosan-P (15.6 µg/mL) was lower than Chitosan-P (31.2 µg/mL) and EGCG (500 µg/mL) against Pseudomonas fluorescens (p < 0.05). Additionally, EGCG-g-chitosan-P and Chitosan-P presented higher Staphylococcus aureus growth inhibition (100%) than EGCG at the lowest concentration tested. The nanoparticles produced an increase of ROS (p < 0.05) in both bacterial species assayed. Furthermore, EGCG-g-chitosan-P exhibited higher antioxidant activity than that of Chitosan-P (p < 0.05) in 2,2-azino-bis (3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS), 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) and ferric-reducing antioxidant power assays. Based on the above results, EGCG-g-chitosan-P shows the potential for food packaging and biomedical applications.

Original languageEnglish
Article number1375
JournalPolymers
Volume13
Issue number9
DOIs
StatePublished - 1 May 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Antibacte-rial
  • Antioxidant
  • Epigallocatechin gallate
  • Grafted chitosan
  • Modified chitosan
  • Nanoparticles

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