High-fluorescent carbon dots (CDs) originated from China grass carp scales (CGCS) for effective detection of Hg(II) ions

Liu, Guanhong; Jia, Haishuang; Li, Na; Li, Xinyi; Yu, Zhiyue; Wang, Jun; Song, Youtao

doi:10.1016/j.microc.2018.11.044

Cited by 68 publications

(23 citation statements)

References 45 publications

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“…The C dots were used to detect Hg 2+ in the concentration range of 0–40 × 10 −6 m based on static and dynamic quenching mechanism. Similarly, C dots prepared from citric acid,75c edible mushrooms, and cysteine were used for quantitation of Hg 2+ , with limits of detection (LODs) of 20 × 10 −9 , 4.13 × 10 −9 , and 14 × 10 −9 m , respectively. C dots prepared from polyurethane, with a blue‐green emission and a QY of 33%, were sensitive (LOD of 2.8 × 10 −6 m ) and selective for quantitation of Ag + through the static quenching process .…”

Section: Sensing and Imaging Applicationsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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Carbon dots (C dots) with biocompatibility, brightness, stability against photoirradiation and salt, and ease in preparation have become important materials for sensing and imaging. They can be prepared from natural materials and small organic molecules through hydrothermal, microwave‐assistant, and electrochemical methods, with advantages of simplicity and low cost. To enhance the quantum yields of C dots in the red and near‐infrared regions, doping of C dots with heteroatoms such as nitrogen and sulfur has been suggested. C dots both with and without being functionalized recognition elements such as antibodies and aptamers are selective and sensitive for sensing of analytes, including metal ions (e.g., Fe3+, Hg2+, Cu2+), small molecules (e.g., H2O2, cysteine, glutathione), and biopolymers like proteins, as well as for in vitro and in vivo imaging. Depending on the size, charge, and surface ligands of C dots used to label cells, fluorescence images of different organelles are shown. Multicolor images of bacteria, mammalian cells, and plant tissues incubated with C dots are realized when excited at different wavelengths. In this review, many excellent sensing and imaging examples of C dots are presented to highlight their features and to show their challenges for analytical applications.

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Section: Sensing and Imaging Applicationsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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“…S1A). The distinct characteristic peaks at 3412, 1660, 1548, 1415, and 1123 cm −1 were ascribed to N‐H/O‐H, CC, ‐NH 2 , C‐O‐C, and C‐OH, bonds, 41 respectively. Furthermore, X‐ray photoelectron spectroscopy (XPS) spectra were utilized to inspect the composition of CdTe QDs/corn CDs.…”

Section: Resultsmentioning

confidence: 99%

Determination of l‐theanine in tea water using fluorescence‐visualized paper‐based sensors based on CdTe quantum dots/corn carbon dots and nano‐porphyrin with chemometrics

et al. 2020

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BACKGROUND The quality of tea is influenced by numerous factors, especially l‐theanine, which is one of the important markers used to evaluate the sweetness and freshness of tea. Sensitive, rapid, and accurate detection of l‐theanine is therefore useful to identify the grade and quality of tea. RESULTS A high‐sensitivity, paper‐based fluorescent sensor combined with chemometrics was established to detect l‐theanine in tea water based on CdTe quantum dots / corn carbon dots and nano tetra pyridel‐porphine zinc (ZnTPyP). To verify the reliability of this method, fluorescence spectra and fluorescence‐visualized paper‐based sensors were compared. The fluorescence spectrum method demonstrated a linear range of 1 to 10 000 nmol L−1 and a limit of detection (LOD) of 0.19 nmol L−1. In the fluorescence‐visualized paper‐based sensors there was a linear range of 10–1000 nmol L−1, and the LOD was 10 nmol L−1. Partial least squares discriminant analysis (PLSDA) and partial least squares regression analysis (PLSR) were used successfully to determine l‐theanine accurately in tea water with this approach. The accuracy of the PLSDA model was 100% both in the training set and the predicting set, and the correlation coefficient between the actual concentration and the predicted concentration was greater than 0.9997 in the PLSR model. CONCLUSION This fluorescence‐visualized paper‐based sensor, combined with chemometrics, could be applied efficiently to the practical analysis of tea water samples, which provides a new idea to ensure the flavor and quality of tea. © 2020 Society of Chemical Industry

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“…A slightest accumulation in food chains, especially in aquatic systems, leads to serious health hazards to human beings because of its poisoning effect on the kidney, liver, cardiovascular, and central nervous system (CNS) of the human body ( Gu et al., 2016 ). The guidelines by WHO for intake of mercury through water is 1 μg/L ( Liu et al., 2019a ) and via air is 2 μg/kg body weight per day. Therefore, it is necessary to detect Hg for protecting the environment and avoiding health hazards.…”

Section: Carbon Dots For Heavy Metal Ion Detectionmentioning

confidence: 99%

“…Guanhong Liu et al. ( Liu et al., 2019a ) prepared CDs from China Grass carp scales (CGCS) raw material and gave more insight into FL quenching mechanisms using FTIR, lifetime, and absorbance studies. FL quenching of CDs was identified as fluorescence resonance energy transfer and weresuccessfully tested in water samples and cosmetics.…”

Section: Carbon Dots For Heavy Metal Ion Detectionmentioning

confidence: 99%