Fluorescence turn-on detection of fenitrothion using gold nanoparticle quenched fluorescein and its separation using superparamagnetic iron oxide nanoparticle

Add time:08/28/2019    Source:sciencedirect.com

In this work, a simple and sensitive determination of fenitrothion is developed on the basis of Nanometal Surface Energy Transfer (NSET) of gold nanoparticle on the fluorescence of fluorescein. The developed gold nanoparticle quenched fluorescein system exhibits high sensitivity and selectivity towards fenitrothion in the presence of different pesticides, anions and cations. The fluorescence turn on response of the gold nanoparticle quenched fluorescein probe towards fenitrothion is successfully demonstrated on a paper strip. The real sample analysis was carried out using water samples from different sources and has limit of detection of 6.05 nM, 9.41 nM and 7.84 nM for well water, tap water and river water respectively. However, attempt to simultaneously separate and sense fenitrothion using gold nanoparticle enveloped over superparamagnetic iron oxide nanoparticle was not successful due to the irreversible quenching of fluorescence of fluorescein by Fe3+ ion present in iron oxide nanoparticle, which inhibits the requisite turn-on fluorescence of the probe. Furthermore, we successfully employed superparamagnetic iron oxide to magnetically separate fenitrothion attached to gold nanoparticle from the contaminated water.

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