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题名: Presence of photoluminescent carbon dots in Nescafe (R) original instant coffee: Applications to bioimaging
作者: Jiang, Chengkun1, 2;  Wu, Hao2;  Song, Xiaojie2;  Ma, Xiaojun2;  Wang, Jihui1;  Tan, Mingqian2
关键词: Carbon dots ;  Nescafe (R) original instant coffee ;  Photoluminescent ;  Bioimaging
刊名: TALANTA
发表日期: 2014-09-01
DOI: 10.1016/j.talanta.2014.01.046
卷: 127, 页:68-74
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical
研究领域[WOS]: Chemistry
英文摘要: The presence of the carbon dots (C-dots) in food is a hotly debated topic and our knowledge about the presence and the use of carbon dots (C-dots) in food is still in its infancy. We report the finding of the presence of photoluminescent (PL) C-dots in commercial Nescafe instant coffee. TEM analysis reveals that the extracted C-dots have an average size of 4.4 nm. They were well-dispersed in water and strongly photoluminescent under the excitation of ultra-violet light with a quantum yield (QY) about 5.5%, which were also found to possess clear upconversion PL properties. X-ray photoelectron spectroscopy characterization demonstrates that the C-dots contain C, O and N three elements with the relative contents ca. 30.1, 62.2 and 7.8%. The X-ray diffraction (XRD) analysis indicates that the C-dots are amorphous. Fourier-transform infrared (FTIR) spectra were employed to characterize the surface groups of the C-dots. The C-dots show a pH independent behavior by varying the pH value from 2 to 11. The cytotoxicity study revealed that the C-dots did not cause any toxicity to cells at a concentration as high as 20 mg/mL. The C-dots have been directly applied in cells and fish imaging, which suggested that the C-dots present in commercial coffee may have more potential biological applications. (C) 2014 Published by Elsevier B.V.
关键词[WOS]: NANOPARTICLES ;  LUMINESCENCE ;  BRIGHT ;  PROBES ;  SOOT
语种: 英语
WOS记录号: WOS:000338620300009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145637
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Polytech Univ, Sch Biol & Food Engn, Dalian 116034, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Div Biotechnol, Dalian 116023, Peoples R China

Recommended Citation:
Jiang, Chengkun,Wu, Hao,Song, Xiaojie,et al. Presence of photoluminescent carbon dots in Nescafe (R) original instant coffee: Applications to bioimaging[J]. TALANTA,2014,127:68-74.
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