Abstract
An aqueous suspension of fluorescent nanoparticles (PHNNPs) of naphthol based fluorescent organic compound 1-[(Z)-(2-phenylhydrazinylidene) methyl] naphthalene −2-ol (PHN) were prepared using reprecipitation method shows bathochromically shifted aggregation induced enhanced emission (AIEE) in the spectral region where erythrosine (ETS) food dye absorbs strongly. The average size of 72.6 nm of aqueous suspension of PHNNPs obtained by Dynamic light scattering results shows a narrow particle size distribution. The negative zeta potential of nano probe (−22.6 mV) responsible to adsorb oppositely charged analyte on its surface and further permit to bind nano probe and analyte within the close distance proximity required for efficient fluorescence resonance energy transfer (FRET) to take place from donor (PHNNPs) to acceptor (ETS). Systematic FRET experiments performed by measuring fluorescence quenching of PHNNPs with successive addition of ETS solution exploited the use of the PHNNPs as a novel nano probe for the detection of ETS in aqueous solution with extremely lower limit of detection equal to 3.6 nM (3.1 ng/mL). The estimation of photo kinetic and thermodynamic parameters such as quenching rate constant, enthalpy change (∆H), Gibbs free energy change (∆G) and entropy change (∆S) was obtained by the quenching results obtained at different constant temperatures which were found to fit the well-known Stern–Volmer relation. The mechanism of binding and fluorescence quenching of PHNNPs by ETS food dye is proposed on the basis of results obtained in photophysical studies, thermodynamic parameter, energy transfer efficiency, critical energy transfer distance (R0) and distance of approach between donor–acceptor molecules (r). The proposed FRET method based on fluorescence quenching of PHNNPs was successfully applied to develop an analytical method for estimation of ETS from food stuffs without interference of other complex ingredients.
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Acknowledgments
One of the authors PGM is grateful to the University Grants Commission (UGC), New Delhi for providing financial assistance in the form of UGC-BSR-SAP fellowship (F.25-1/2013-14(BSR)/7-183/2007(BSR)- May 2014). We are also grateful to the Department of Science and Technology (DST), New Delhi for providing funds under FIST-Level-II program for infrastructure improvement and University Grants Commission (UGC), New Delhi for financial support through DRS - Phase- II program to the Department of Chemistry, Shivaji University, Kolhapur.
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Mahajan, P.G., Bhopate, D.P., Kolekar, G.B. et al. FRET Sensor for Erythrosine Dye Based on Organic Nanoparticles: Application to Analysis of Food Stuff. J Fluoresc 26, 1467–1478 (2016). https://doi.org/10.1007/s10895-016-1839-7
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DOI: https://doi.org/10.1007/s10895-016-1839-7