Green Synthesis of Fluorescent Carbon Dots for Selective Detection of Tartrazine in Food Samples

Transcription

1 Supporting Information Green Synthesis of Fluorescent Carbon Dots for Selective Detection of Tartrazine in Food Samples Hua Xu, Xiupei Yang, *, Gu Li, Chuan Zhao, and Xiangjun Liao *, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong , P.R. China Exposure and Biomonitoring Division, Health Canada, 50 Colombine Driveway, Ottawa, K1A 0K9 Canada Transmission electron microscopic. TEM images were recorded in a Tecnai G2 F20 instrument with an accelerating voltage of 200 kv. Samples were prepared by drop-wise addition of an appropriate solution onto a carbon-coated 300 mesh Cu grid followed by solvent evaporation in air. Energy Dispersive X-ray Spectrometer. EDS patterns were obtained with a JMS-6510 scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometer (JEOL, Japan). Table S1. Comparison of quantum yield and applications of the C-dots derived from aloe with the reported methods Carbon source QY(%) Synthetic method Application Refs. Graphite rod 16.5 Electrochemical exfoliation Photocatalytic activity (1) Graphite powder Laser ablation (2) Edible chicken eggs 6-8 Plasma-induced Printing inks (3) Carbon soot 1.6 Arc discharge (4) Eggshell membrane 14 Microwave-assisted Glutathione detection (5) Glycerol Microwave assisted (6) Orange Waste Peels 36 Hydrothermal Photocatalyst (7) Honey 19.8 Hydrothermal Detection of Fe3 + and HEp-2 and hela cells imaging Saccharum officinarum juice Solanum tuberosum (potato) 5.76 Hydrothermal Bacteria and yeast cells imaging 6.14 Hydrothermal HeLa cell imaging (10) Apple juice 4.27 Hydrothermal M. tuberculosis, P. aeruginosa and M. oryzae imaging Aloe Hydrothermal Tartrazine detection This work (8) (9) (11)

2 Figure S1. Fluorescence spectra (a) and plot (b) of C-dots prepared under various reaction times when the temperature was Figure S2. Fluorescence spectra (a) and plot (b) of C-dots prepared under various reaction temperatures when the time was 11 h Figure S3. TEM image of the C-dots. 31

3 Figure S4. EDS spectra of the C-dots Figure S5. Photostability study of C-dots under UV light irradiation. The CDs solutions were irradiated by UV light at an excitation wavelength of 365 nm for 120 min at 15 min time intervals Figure S6. Fluorescence emission spectra: (a) 450 μl of C-dots solution, (b) 450 μl of C-dots solution and 7.5 μm tartrazine in 30 mm phosphate buffer solution (ph=6.0) ( 441nm). ex

4 45 46 Figure S7. Uv-vis absorption spectra of the C-dots and the C-dots-tartrazine system References (1) Ming, H.; Ma, Z.; Liu, Y.; Pan, K. M.; Yu, H.; Wang, F. ; Kang, Z. H. Large scale electrochemical synthesis of high quality carbon nanodots and their photocatalytic property. Dalton Trans. 2012, 41, (2) Sun, Y. P.; Zhou, B.; Lin, Y.; Wang, W.; Shiral Fernando, K. A.; Pathak, P.; Mohammed, J.M.; Harruff, B. A,; Wang, X.; Wang, H. F.; Luo,P. J. G.; Yang, H.; Kose, M. E.; Chen, B. L.; Veca, L. M.; Xie, S. Y. Quantum-sized carbon dots for bright and colorful photoluminescence. J. Am. Chem. Soc. 2006, 128, (3) Wang, J.; Wang C. F.; Chen, S. Amphiphilic egg-derived carbon dots: rapid plasma fabrication, pyrolysis process, and multicolor printing patterns. Angew. Chem. Int. Ed. 2012, 51, (4) Xu, X. Y.; Ray, R.; Gu, Y. L.; Ploehn, H. J.; Gearheart, L.; Raker, K.; Scrivens, W. A. Electrophoretic Analysis and Purification of Fluorescent Single-Walled Carbon Nanotube Fragments. J. Am. Chen. Soc. 2004, 126, (5) Wang, Q.; Liu, X.; Zhang, L. C.; Lv, Y. Microwave-assisted synthesis of carbon nanodots through an eggshell membrane and their fluorescent application. Analyst. 2012, 137, (6) Wang, X. H.; Qu, K. G.; Xu, B. L,; Ren, J. S.; Qu, X. G. Microwave assisted one-step green synthesis of cell-permeable multicolor photoluminescent carbon dots without surface passivation reagents. J. Mater. Chem. 2011, 21, (7) Prasannan, A.; Imae, T. One-Pot Synthesis of Fluorescent Carbon Dots from Orange Waste Peels. Ind. Eng. Chem. Res. 2013, 52,

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