Antifungal activity and mechanism of palladium-modified nitrogen-doped titanium oxide photocatalyst on agricultural pathogenic fungi Fusarium graminearum

Jingtao Zhang, Yang Liu, Qi Li, Xiaoping Zhang, Jian Ku Shang

Research output: Contribution to journalArticlepeer-review

Abstract

Fusarium graminearum is the pathogen for Fusarium head blight (FHB) on wheat, which could significantly reduce grain quality/yield and produce a variety of mycotoxins posing a potential safety concern to human foods. As an environmentally friendly alternative to the commonly used chemical fugicides, a highly effective photocatalytic disinfection of F. graminearum macroconidia under visible light illumination was demonstrated on a visible-light-activated palladium-modified nitrogen-doped titanium oxide (TiON/PdO) nanoparticle photocatalyst. Because of the opposite surface charges of the TiON/PdO nanoparticles and the F. graminearum macroconidium, the nanoparticles were strongly adsorbed onto the macroconidium surface, which is beneficial to the photocatalytic disinfection of these macroconidia. The photocatalytic disinfection mechanism of TiON/PdO nanoparticles on these macroconidia could be attributed to their cell wall/membrane damage caused by the attack from reactive oxygen species (ROSs) as demonstrated by the fluorescence/phase contrast microscopy observations, while a breakage of their cell structure was not necessary for their loss of viability.

Original languageEnglish (US)
Pages (from-to)10953-10959
Number of pages7
JournalACS Applied Materials and Interfaces
Volume5
Issue number21
DOIs
StatePublished - Nov 13 2013

Keywords

  • Fusarium graminearum macroconidia
  • TiON/PdO nanoparticles
  • fluorescence staining
  • photocatalytic disinfection
  • visible light

ASJC Scopus subject areas

  • Materials Science(all)

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