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Effect of Silver Nanoparticles on the Photophysics of Riboflavin: Consequences on the ROS Generation

Journal Article · · Journal of Physical Chemistry. C

Metal-enhanced singlet oxygen, O2(1Δg), generation is a desirable effect to augment the amount of O2(1Δg) produced upon irradiation of organic sensitizers. Herein, we employed pectin for stabilizing 9 nm silver nanoparticles and showed that these particles are able to form a ground-sate complex with riboflavin (Rf). Pump–probe transient absorption spectroscopy and laser flash-photolysis experiments proved that the excited state of the riboflavin–Ag complex feeds the triplet state of the sensitizer, which results in an enhanced intersystem crossing process. We note the higher amounts of riboflavin triplet states formed in the presence of the nanoparticles result in higher yields of singlet oxygen and hydrogen peroxide produced in the irradiated colloidal suspensions. As a result, not only the effect on singlet oxygen but also the effect on superoxide radical ion should contribute to a better performance of Riboflavin as a sensitizer applied to the photodynamic therapy of tumors.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Solar Fuel Production (BISfuel)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) (Argentina)
Grant/Contract Number:
SC0001016
OSTI ID:
1369655
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 38 Vol. 120; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Photocatalytic and antibacterial potential of silver nanoparticles derived from pineapple waste: process optimization and modeling kinetics for dye removal journal September 2018
Effect of hybrid SiO 2 @Ag nanoparticles with raspberry-like morphology on the excited states of the photosensitizers Rose Bengal and riboflavin journal January 2019

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