Journal
ANALYST
Volume 134, Issue 10, Pages 2106-2112Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b905426j
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-
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Funding
- National Science Council [NSC97-2113-M-110-001]
- National Sun Yat-sen University-Kaohsiung Medical University Joint Research Center
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Selective turn-on fluorescence detection of I- was accomplished using fluorescein isothiocyanate-decorated gold nanoparticles (FITC-AuNPs). FITC molecules, which fluoresce strongly in an alkaline solution, were severely quenched when they were attached to the surface of AuNPs through their isothiocyanate group. Upon the addition of I-, FITC molecules were detached because of I- adsorption on the surface of AuNPs. As a result, released FITC molecules were restored to their original fluorescence intensity. Because I- has a higher binding affinity to the surface of Au than do Br-, Cl-, or F-, the FITC-AuNPs obviously have a higher selectivity toward I- than toward these other anions. Meanwhile, after IO3- was reduced to I- with ascorbic acid, the detection of IO3- was successfully achieved using the FITC-AuNPs. Under an optimum pH and AuNP concentration, the lowest detectable concentrations of I- and IO3- using this probe were 10.0 and 50.0 nM, respectively. The FITC-AuNPs provide a number of advantages, including easy preparation, selectivity, sensitivity, and low cost. This unique probe was applied to an analysis of the total iodine in edible salt and seawater.
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