A highly sensitive and selective “on-off-on” fluorescent sensor based on nitrogen doped graphene quantum dots for the detection of Hg2+ and paraquat

Du, Fuyou; Sun, Lingshun; Zen, Qiulian; Tan, Wei; Cheng, Zhenfang; Ruan, Guihua; Li, Jianping

doi:10.1016/j.snb.2019.02.109

Cited by 110 publications

(31 citation statements)

References 45 publications

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“…The two stage linear ranges of this detection method was similar to some literatures. 31,42 The LOD was 1.5 mM, computed as 3 times the standard deviation of the FI of the blank (n ¼ 12) divided by K SV (Stern-Volmer constant). 37 This value compares to the World Health Organization (WHO) drinking water standard for Cr(VI) of <50 mg L À1 (<0.96 mM).…”

Section: Fluorescence Determination Of Cr(vi)mentioning

confidence: 99%

“…The slight changes in FLs indicate a static quenching between SQDs and Cr(VI). 41,42 This phenomenon excludes the FRET process between SQDs and Cr(VI) because the FLs of the mixed system would be substantially changed by an efficient FRET process. 22 Additionally, the UV-Vis absorption spectra of Cr(VI) partially overlapped with the uorescence excitation wavelength of SQDs (Fig.…”

Section: Quenching Mechanisms Of Sqds By Cr(vi)mentioning

confidence: 99%

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Sulfur quantum dot-based “ON–OFF–ON” fluorescence platform for detection and bioimaging of Cr(vi) and ascorbic acid in complex environmental matrices and biological tissues

et al. 2021

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Section: Fluorescence Determination Of Cr(vi)mentioning

confidence: 99%

Section: Quenching Mechanisms Of Sqds By Cr(vi)mentioning

confidence: 99%

Sulfur quantum dot-based “ON–OFF–ON” fluorescence platform for detection and bioimaging of Cr(vi) and ascorbic acid in complex environmental matrices and biological tissues

et al. 2021

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“…However, paraquat is a highly toxic herbicide and exhibits significant risks to human health and the surrounding environment. Du et al developed a selective N-GQDs-based fluorescent "ON-OFF-ON" sensor for the detection of Hg 2+ and paraquat (Du et al, 2019). The emission intensity of N-GQDs showed substantial quenching in the presence of Hg 2+ ions (turn off).…”

Section: Pesticidesmentioning

confidence: 99%

Recent progress on graphene quantum dots‐based fluorescence sensors for food safety and quality assessment applications

Sharma

Ali

Devaraj

et al. 2021

Comp Rev Food Sci Food Safe

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The versatile photophysicalproperties, high surface-to-volume ratio, superior photostability, higher biocompatibility, and availability of active sites make graphene quantum dots (GQDs) an ideal candidate for applications in sensing, bioimaging, photocatalysis, energy storage, and flexible electronics. GQDsbased sensors involve luminescence sensors, electrochemical sensors, optical biosensors, electrochemical biosensors, and photoelectrochemical biosensors.Although plenty of sensing strategies have been developed using GQDs for biosensing and environmental applications, the use of GQDs-based fluorescence techniques remains unexplored or underutilized in the field of food science and technology. To the best of our knowledge, comprehensive review of the GQDsbased fluorescence sensing applications concerning food quality analysis has not yet been done. This review article focuses on the recent progress on the synthesis strategies, electronic properties, and fluorescence mechanisms of GQDs.The various GQDs-based fluorescence detection strategies involving Förster resonance energy transfer-or inner filter effect-driven fluorescence turn-on and turn-off response mechanisms toward trace-level detection of toxic metal ions, toxic adulterants, and banned chemical substances in foodstuffs are summarized. The challenges associated with the pretreatment steps of complex food matrices and prospects and challenges associated with the GQDs-based fluorescent probes are discussed. This review could serve as a precedent for further advancement in interdisciplinary research involving the development of versatile GQDs-based fluorescent probes toward food science and technology applications.

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“…The 'turn-off-on' detection mode combined with compounds that can specifically recognize target components and have fluorescence quenching ability of QDs improves its specificity and anti-interference ability. 19 And it has been used in cell imaging, 20 medical diagnosis, 21 detection of heavy metal ions, 22 pesticides 23,24 and food authenticity. 25 One of the compounds with the ability to quench QDs is porphyrin, and has wide application prospects in electronic and optical devices, chemical sensors, biosensors, catalysis, etc., which have excellent photoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent sensor based on quantum dots and nano‐porphyrin for highly sensitive and specific determination of ethyl carbamate in fermented food

Wei

Chen

et al. 2021

J Sci Food Agric

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BACKGROUND: Ethyl carbamate (EC) is a potentially toxic carcinogen produced during fermentation and storage of fermented foods, and many countries have set thresholds for its content in food. Therefore, sensitive, rapid and accurate detection of EC is meaningful to ensure the quality of fermented food.RESULTS: This study introduces a CdTe quantum dots/nano-5,10,15,20-tetrakis (4-methoxyphenyl)-porphyrin (nano TPP-OCH 3 ) fluorescence sensor system detection of EC. The specificity of this sensing mainly relies on a photo-induced electron transfer and electrostatic force interaction between EC and nano TPP-OCH 3 . This sensor presented a linear range of 10 to 1000 ∼g L −1 (R 2 = 0.9903) with a low detection limit of 7.14 ∼g L −1 . Meanwhile, the recovery (91.19-101.09%) and precision [relative standard deviation (RSD) = 0.64-3.05%] of the sensor for the analysis of fermented food (yellow rice wine, soy sauce, Chinese spirits, Pu-erh tea) samples were good and could meet the requirements of practical detection. Moreover, the detection results of fermented food (yellow rice wine, soy sauce, Chinese spirits, Pu-erh tea) samples by this sensor are basically consistent with those of high-performance liquid chromatography with fluorescence detector (HPLC-FLD).CONCLUSION: This method was expected to provide a potential platform for sensitive and accurate detection of EC in food safety monitoring, which would provide knowledge of the flavor and quality related to fermented food.

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A highly sensitive and selective “on-off-on” fluorescent sensor based on nitrogen doped graphene quantum dots for the detection of Hg2+ and paraquat

Cited by 110 publications

References 45 publications

Sulfur quantum dot-based “ON–OFF–ON” fluorescence platform for detection and bioimaging of Cr(vi) and ascorbic acid in complex environmental matrices and biological tissues

Sulfur quantum dot-based “ON–OFF–ON” fluorescence platform for detection and bioimaging of Cr(vi) and ascorbic acid in complex environmental matrices and biological tissues

Recent progress on graphene quantum dots‐based fluorescence sensors for food safety and quality assessment applications

Fluorescent sensor based on quantum dots and nano‐porphyrin for highly sensitive and specific determination of ethyl carbamate in fermented food

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