Abstract
The authors describe a "turn-on" fluorometric method for determination of β-carotene. It is based on competitive host-guest interaction between rhodamine 6G (R6G) and β-carotene and graphene oxide nanoparticles that were functionalized with β-cyclodextrin (β-CD)-modified polyethylenimine (β-CD-PEI-GO). On addition of R6G to a solution of β-CD-PEI-GO, its fluorescence is quenched because of the inclusion of R6G into the β-CD moiety. Both Förster resonance energy transfer and electron transfer are likely to occur. On further addition of a sample containing β-carotene, it will replace R6G in the cavity, thereby releasing R6G to the bulk solution. This is due to the stronger affinity of β-carotene for β-CD in the complex, but also because of repulsion between the positively charged β-CD-PEI-GO complex and the positively charged R6G dye. The displacement of R6G by β-carotene leads to fluorescence recovery whose efficiency (expressed as F/F0) is related to the β-carotene concentration in the range from 0.1 to 4.0 μmol⋅L‾1. The detection limit for β-carotene is 5.4 nmol⋅L‾1 which is lower than that of any other optical method.
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This work was supported by the National Natural Science Foundation of China (21205002) and the Innovation Funds of Anhui Normal University (No. 2014cxjj09).
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Jinshui Liu and Guoning Liu have contributed equally to the work
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Liu, J., Liu, G., Liu, W. et al. Turn-on fluorometric β-carotene assay based on competitive host-guest interaction between rhodamine 6G and β-carotene with a graphene oxide functionalized with a β-cyclodextrin-modified polyethyleneimine. Microchim Acta 183, 1161–1168 (2016). https://doi.org/10.1007/s00604-016-1747-1
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DOI: https://doi.org/10.1007/s00604-016-1747-1