Anti-counterfeiting application of fluorescent carbon dots derived from wasted coffee grounds

Hong, Woo Tae; Yang, Hyun Kyoung

doi:10.1016/j.ijleo.2021.166449

Cited by 26 publications

(8 citation statements)

References 44 publications

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“…The C=O group shows an intense absorbance in TCDs at 1604 cm −1 , although the most interesting feature of the FTIR spectra of TCDs is the intense band appearing at 1030 cm -1 , which is assignable to the stretching of C-O-C bonds [21]. The C-O bond is also confirmed by the presence of bands at 1229 cm −1 and 1360 cm −1 belonging to the flexion vibration of C-O bond.…”

Section: Surface Characterizationmentioning

confidence: 93%

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Biocompatibility and Antioxidant Capabilities of Carbon Dots Obtained from Tomato (Solanum lycopersicum)

et al. 2022

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Since their discovery in 2004, carbon dots have attracted strong interest in the scientific community due to their characteristic properties, particularly their luminescence and their ease of synthesis and derivatization. Carbon dots can be obtained from different carbon sources, including natural products, resulting in a so-called ’green synthesis’. In this work, we obtain carbon dots from tomato juice in order to obtain nanoparticles with the antioxidant capabilities of the natural antioxidants present in that fruit. The obtained material is characterized regarding nanoparticle size distribution, morphology, surface functional groups and optic properties. Antioxidant properties are also evaluated through the DPPH method and their cytotoxicity is checked against human dermal fibroblast and A549 cell-lines. The results indicate that carbon dots obtained from tomato have a higher antioxidant power than other already-published antioxidant carbon dots. The bandgap of the synthesized materials was also estimated and coherent with the literature values. Moreover, carbon dots obtained from tomato juice are barely toxic for healthy cells up to 72 h, while they induce a certain cytotoxicity in A549 lung carcinoma cells.

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Section: Surface Characterizationmentioning

confidence: 93%

“…Both TCDs and GCDs also show an intense band at 2925 cm −1 , which is attributable to C-H bonds in aromatic rings. The presence of a broad band at 1604 cm −1 corresponds to C=O stretching, but also to stretching vibrations of C=C and C=N, which may be associated with the aromatic bonding of CD [21,22].…”

Section: Surface Characterizationmentioning

confidence: 99%

Biocompatibility and Antioxidant Capabilities of Carbon Dots Obtained from Tomato (Solanum lycopersicum)

et al. 2022

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“…Comparison of prepared C-dots with the previously reported C-dots from waste material. References [ 50 , 51 , 52 , 53 , 54 , 55 , 56 ] are cited in the supplementary materials.…”

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confidence: 99%

Coconut Carbon Dots: Progressive Large-Scale Synthesis, Detailed Biological Activities and Smart Sensing Aptitudes towards Tyrosine

et al. 2022

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In the recent era, carbon dots (C-dots) have been extensively considered as a potential tool in drug delivery analysis. However, there have been fewer reports in the literature on their application in the sensing of amino acids. As part of our ongoing research on coconut-husk-derived C-dots, we synthesized C-dots under different temperature conditions and utilized them in the field of amino acid sensing and found them to be highly selective and sensitive towards tyrosine. The detailed characterization of the prepared C-dots was carried out. The developed C-dots exhibit good values of quantum yield. BSA, HSA and glutamic acid were utilized to explore the binding efficiency of C-dots with biologically active components. Hemolysis, blood clotting index activity and cell viability assays using the prepared C-dots were evaluated and they were found to be biocompatible. Therefore, the C-dots described in this work have high potential to be utilized in the field of amino acid sensing, especially L-tyrosine. The limit of detection and the binding constant for the developed C-dots in the presence of tyrosine were found to be 0.96 nM and 296.38 nM−1, respectively. The efficiency of the developed C-dots was also investigated in the presence of various other amino acids and different water mediums in order to enhance the working scope of the developed sensors.

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“…Among the mentioned methods for the synthesis of CQDs, the hydrothermal method has the advantages of synthesizing CQDs with low toxicity, biocompatibility, superior PL performance, chemical, and thermal stability, and low photo-bleaching 26 . CQDs have been synthesized from different natural sources such as orange peel 27 , banana peel 25 , coffee ground 28 , lemon juice 29 , etc. Synthesis of CQDs from natural sources might result in a product with a decreased toxicity in comparison to other chemicals as the starting material 15 .…”

Section: Introductionmentioning

confidence: 99%

Gadolinium-doped fluorescent carbon quantum dots as MRI contrast agents and fluorescent probes

Molaei

2022

Sci Rep

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In this research passivated gadolinium-doped carbon quantum dots (Gd-doped CQDs) were synthesized from starch by a hydrothermal method. The X-ray diffraction (XRD) pattern of the Gd-doped CQDs showed the formation of highly amorphous carbon. The Fourier transform infrared spectroscopy (FTIR) results suggested that the CQDs are functionalized with C-N and N–H bonds. The synthesized CQDs with a size distribution of 2–8 nm have an absorption peak at 271 nm in UV–Visible spectroscopy (UV–Vis). The photoluminescence (PL) in CQDs was dependent on the excitation wavelength. The QY of the synthesized CQDs was calculated to be 13.2%. The Gd-doped CQDs exhibited sustained PL in ionic solutions with different ionic strengths and different temperatures up to 65 °C. Fluorescence imaging on mouse C34/connective tissue-L929 cells confirmed that Gd-doped CQDs could be well distributed over the cytoplasm. The magnetic resonance imaging (MRI) showed that the Gd-doped CQDs have extremely high longitudinal and transverse relaxivity values of as high as 218.28 mM−1 s−1 and 364.68 mM−1 s−1. The synthesized Gd-doped CQDs are promising candidates as multifunctional imaging probes and MRI contrast agents in biomedical diagnosis and brain mapping applications.

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Anti-counterfeiting application of fluorescent carbon dots derived from wasted coffee grounds

Cited by 26 publications

References 44 publications

Biocompatibility and Antioxidant Capabilities of Carbon Dots Obtained from Tomato (Solanum lycopersicum)

Biocompatibility and Antioxidant Capabilities of Carbon Dots Obtained from Tomato (Solanum lycopersicum)

Coconut Carbon Dots: Progressive Large-Scale Synthesis, Detailed Biological Activities and Smart Sensing Aptitudes towards Tyrosine

Gadolinium-doped fluorescent carbon quantum dots as MRI contrast agents and fluorescent probes

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