Fluorescent organic nanoparticles (FONs) for the selective recognition of Zn2+: Applications to multi-vitamin formulations in aqueous medium

•Fluorescent organic nanoparticles (FONs).•High fluorescence intensity for selective detection of Zn2+ in aqueous medium.•Selective detection of Zn2+ in real sample analysis of commercially available multi-vitamin tablets.•Nanomolar detection. The ligand N,N′-bis(pyridyl-2yl-methyl)ethylenediimine (...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-02, Vol.223, p.59-67
Main Authors: Huerta-Aguilar, Carlos Alberto, Pandiyan, Thangarasu, Raj, Pushap, Singh, Narinder, Zanella, Rodolfo
Format: Article
Language:English
Subjects:
Electron transfer
Fluorescence
Fluorescence organic nanoparticles
Formulations
Ligands
Metal ions
Multivitamin analysis
Nanoparticles
Nutrients
Recognition
Recognition of Zn2
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Summary:•Fluorescent organic nanoparticles (FONs).•High fluorescence intensity for selective detection of Zn2+ in aqueous medium.•Selective detection of Zn2+ in real sample analysis of commercially available multi-vitamin tablets.•Nanomolar detection. The ligand N,N′-bis(pyridyl-2yl-methyl)ethylenediimine (PMEDI) was synthesized and then transformed into organic nanoparticles (ONPs) which were characterized by analytical methods. The ONPs were employed for the specific recognition of Zn2+ in an aqueous medium by measuring the fluorescence intensity that increased with the concentration of Zn2+ in the PMEDI solution. This proves that PMEDI-ONPs act as a chemo-sensor in detecting Zn2+ at low concentration in aqueous medium. This chemo-sensor (ONPs) is able to determine the concentration of Zn2+ ion in multi-vitamin formulations, and does so selectively for Zn2+ in the presence of other nutrient metal ions. Apparently, photo induced electron transfer (PET) works in the PMEDI-ONPs when the fluorophore is excited. For [PMEDI-Zn]2+ system, the PET is inhibited considerably by lowering the receptor HOMO energy due to the formation of a bond between the metal ion and the ligand. Due to inhibition of PET phenomenon the enhancement in the fluorescence emission of PMEDI-ONPs takes place. This is consistent with the theoretical study that the energy of the HOMO of the ligand is lowered when the [PMEDI-Zn]2+ complex is formed.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.09.064