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

• Main Authors: Pang, Suh Cem, Chin, Suk Fun, Aressa, Azman, Ng, Sing Muk
• Format: Article
• Language: English
• Published: Hindawi Publishing Corporation 2014
• Subjects: QD Chemistry
• Online Access: http://ir.unimas.my/id/eprint/30904/1/Fluorescein-Labeled%20Starch%20Maleate%20Nanoparticles%20as%20Sensitive%20Fluorescent%20Sensing%20Probes%20for%20Metal%20Ions%20-%20Copy.pdf; http://ir.unimas.my/id/eprint/30904/; https://www.hindawi.com/journals/jnm/2014/108359/

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.