Quenching of chlorophyll fluorescence induced by silver nanoparticles

Abstract

The interaction between chlorophyll (Chl) and silver nanoparticles (AgNPs) was

Silver nanoparticles affect germination and photosynthesis in tobacco seedlings

“…However, in our study NPQ was decreased in almost all AgNP and AgNO3 treatments. Still, VZA/chlorophyll ratio was mostly lower in AgNP treated tobacco seedlings, so it is possible that AgNPs in interaction with chlorophylls acted as quencher removing the excited electron from the chlorophyll (Queiroz et al 2016).…”

Metal-enhancement study of dual functional photosensitizers with aggregation-induced emission and singlet oxygen generation

“…Although the enhanced electric eld on the surface of 25 nm AgNPs is stronger than the 40 nm and 85 nm AgNPs, the quenching effect of a small AgNPs (e.g., 25 nm) is much higher than the large NPs (e.g.,85 nm) as reported in other literature. 66,67 Hence, the EF MEF is higher when the uorophore locates around a bigger AgNP. Another possible reason is the volumetric effect of the enhanced electric eld around AgNPs, where bigger nanoparticles can enhance the electric eld in a more prominent space/distance from the surface of metal NPs.…”

Phytotoxicity of silver nanoparticles on Vicia faba: Evaluation of particle size effects on photosynthetic performance and leaf gas exchange

“…The observed Fv/Fm Fv/F decrease may be attributed to ETC deactivation, which entails a sequence of events, leading to the reduction to the ATP and NADPH production in the light phase of photosynthesis, compromising the operation of the Calvin cycle and reducing the carbon fixation, and, consequently, producing a lower content of glycosides and starch. In addition, previous studies carried out by our research group studies demonstrated that metal nanoparticles can suppress the Chl emission by transferring the excited electron of Chl to the metal surface (Falco et al, 2015(Falco et al, , 2011Queiroz et al, 2016). Thus, the NPs may be inhibiting the electron transport chain, inducing an increase in the energy dissipation by non-photochemical pathways and consequently reducing the photochemical activities of the plants (Barazzouk et al, 2005;Falco et al, 2011;Vinit-dunand et al, 2002).…”