Fluorescent Nanoparticles from Several Commercial Beverages: Their Properties and Potential Application for Bioimaging

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Date
2015-01-01
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Liao, Han
Yu, Chenxu
Jiang, Chengkun
Liu, Wenqiang
Vera, Juan
Seni, Oscar
Demera, Kevin
Yu, Chenxu
Tan, Mingquan
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Yu, Chenxu
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Agricultural and Biosystems Engineering
Abstract

The presence of nanoparticles in beverages has raised great concern in terms of potential impacts to consumer health. Herein, carbon dots in beverages kvass, pony malta, pilsner beer, Vivant Storm, and Profit were identified. They were shown to have a strong fluorescence under the excitation of ultraviolet light. The emission peaks shift to longer wavelengths accompanied by a remarkable fluorescence intensity decrease. The carbon dots are in the nanosized range and roughly spherical in appearance. Elemental analysis by X-ray photoelectron spectroscopy demonstrated the composition of Kvass carbon dots to be C 83.17%, O 13.83%, and N 3.00%. No cytotoxicity was found at concentrations up to 20 mg/mL for human tongue squamous carcinoma cells, and they can be directly applied in both carcinoma and onion epidermal cell imaging. This work represents the first report of the carbon dots present in beverages, providing valuable insights into these nanoparticles for future biological imaging.

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Reprinted with permission from J. Agric. Food Chem., 2015, 63 (38), pp 8527–8533, doi:10.1021/acs.jafc.5b04216. Copyright 2015 American Chemical Society.

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