Fluorescein-Labeled Starch Maleate Nanoparticles as Sensitive Fluorescent Sensing Probes for Metal Ions

Abstract EN

Fluorescein 5(6)-isothiocyanate starch maleate (FISM) nanoparticles were prepared by covalently attached fluorescein 5(6)-isothiocyanate (FITC) with starch maleate.

FISM nanoparticles with a mean particle size of 87 nm were formed via self-assembly upon precipitation in ethanolic solution.

FISM nanoparticles were strongly fluorescent with maximum emission wavelength of 518 nm.

The fluorescence of FISM nanoparticles can be quenched by silver (Ag+) and lead (Pb2+) ions in a concentration dependent manner.

We have demonstrated the first use of FISM nanoparticles as cheap and effective fluorescent sensing probes for Ag+ and Pb2+ ions with detection limits as low as 2.55 × 10−5 M and 3.64 × 10−5 M, respectively.