Open AccessSimple nanosilver composite for photocatalytic inactivation of Salmonella typhimurium
Author(s) -
Wei XiaoLan,
Qi YuanYuan
Publication year - 2017
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2016.0560
Subject(s) - chlorine , surface plasmon resonance , silver chloride , fourier transform infrared spectroscopy , biomolecule , photocatalysis , visible spectrum , nanoparticle , photochemistry , materials science , chemistry , plasmon , noble metal , composite number , nanocomposite , chemical engineering , nanotechnology , metal , catalysis , optoelectronics , organic chemistry , composite material , electrode , engineering
Photocatalytic killing of Salmonella , one of the most dangerous foodborne pathogens is developed using silver nanoparticles (AgNPs)‐decorated silver chloride grains which is one of the simplest nanosilver composites. This nanosilver composite was synthesised using a precipitation–reduction method and was found to have a strong and broad absorption band of light in the range from visible to near infrared. Inactivation of Salmonella typhimurium using the nanocomposite was significantly enhanced by the irradiation of the visible light, which is due to the surface plasmon resonance of the AgNPs. Plasmonic electrons of the nanoparticle could be transferred to the oxygen molecules in the bacterial solution to produce reactive oxygen species (ROSs), while the corresponding holes could oxidise chloride ions of the AgCl grain to form chlorine atoms. Both ROSs and chlorine atoms degrade biomolecules of the bacterial cell, which was revealed by the Fourier transform infrared spectroscopy of the bacterial cells with the help of chemometric analysis.