scholarly journals Carbon Dot Based Sensing of Dopamine and Ascorbic Acid

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Upama Baruah ◽  
Neelam Gogoi ◽  
Achyut Konwar ◽  
Manash Jyoti Deka ◽  
Devasish Chowdhury ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Carbon Dots ◽  
Probable Mechanism ◽  
Particle Sizes ◽  
Carbon Dot ◽  
Volmer Plot ◽  
Assam Tea

We demonstrate carbon dot based sensor of catecholamine, namely, dopamine and ascorbic acid. Carbon dots (CDs) were prepared from a green source: commercially available Assam tea. The carbon dots prepared from tea had particle sizes of ∼0.8 nm and are fluorescent. Fluorescence of the carbon dots was found to be quenched in the presence of dopamine and ascorbic acid with greater sensitivity for dopamine. The minimum detectable limits were determined to be 33 μM and 98 μM for dopamine and ascorbic acid, respectively. The quenching constants determined from Stern-Volmer plot were determined to be 5 × 10−4 and 1 × 10−4 for dopamine and ascorbic acid, respectively. A probable mechanism of quenching has been discussed in the paper.

scholarly journals Synthesis of Fluorescent Carbon Dots and Their Application in Ascorbic Acid Detection

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1246
Author(s):  
Tengfei Wang ◽  
Hui Luo ◽  
Xu Jing ◽  
Jiali Yang ◽  
Meijun Huo ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Fluorescence Intensity ◽  
Carbon Dots ◽  
Ph Dependence ◽  
Scale Up ◽  
Water Soluble ◽  
Jujube Fruit ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Water-soluble fluorescent carbon dots (CDs) were synthesized by a hydrothermal method using citric acid as the carbon source and ethylenediamine as the nitrogen source. The repeated and scale-up synthetic experiments were carried out to explore the feasibility of macroscopic preparation of CDs. The CDs/Fe3+ composite was prepared by the interaction of the CDs solution and Fe3+ solution. The optical properties, pH dependence and stability behavior of CDs or the CDs/Fe3+ composite were studied by ultraviolet spectroscopy and fluorescence spectroscopy. Following the principles of fluorescence quenching after the addition of Fe3+ and then the fluorescence recovery after the addition of asorbic acid, the fluorescence intensity of the carbon dots was measured at λex = 360 nm, λem = 460 nm. The content of ascorbic acid was calculated by quantitative analysis of the changing fluorescence intensity. The CDs/Fe3+ composite was applied to the determination of different active molecules, and it was found that the composite had specific recognition of ascorbic acid and showed an excellent linear relationship in 5.0–350.0 μmol·L−1. Moreover, the detection limit was 3.11 μmol·L−1. Satisfactory results were achieved when the method was applied to the ascorbic acid determination in jujube fruit. The fluorescent carbon dots composites prepared in this study may have broad application prospects in a rapid, sensitive and trace determination of ascorbic acid content during food processing.

A phenylenediamine-based carbon dot-modified silica stationary phase for hydrophilic interaction chromatography

The Analyst ◽  
2020 ◽  
Vol 145 (3) ◽  
pp. 1056-1061 ◽  
Author(s):  
Yali Yang ◽  
Haijuan Zhang ◽  
Jia Chen ◽  
Zhan Li ◽  
Liang Zhao ◽  
...  
Keyword(s):  
Stationary Phase ◽  
Carbon Dots ◽  
Porous Silica ◽  
Hydrophilic Interaction Chromatography ◽  
Silica Spheres ◽  
Hydrophilic Interaction ◽  
Modified Silica ◽  
Carbon Dot ◽  
New Stationary Phase ◽  
Enhanced Selectivity

Red emitting carbon dots derived from p-phenylenediamine were successfully grafted onto the surface of porous silica spheres which served as a new stationary phase for hydrophilic interaction chromatography with enhanced selectivity.

Ascorbic Acid-Loaded Apoferritin-Assisted Carbon Dot-MnO2 Nanocomposites for the Selective and Sensitive Detection of Trypsin

2018 ◽  
Vol 1 (3) ◽  
pp. 777-782 ◽  
Author(s):  
Qingqing Tan ◽  
Ruirui Zhang ◽  
Weisu Kong ◽  
Fengli Qu ◽  
Limin Lu
Keyword(s):  
Ascorbic Acid ◽  
Sensitive Detection ◽  
Carbon Dot

A rapid and sensitive turn-on fluorescent probe for ascorbic acid detection based on carbon dots–MnO2 nanocomposites

2017 ◽  
Vol 9 (38) ◽  
pp. 5653-5658 ◽  
Author(s):  
Yalei Hu ◽  
Lin Zhang ◽  
Xin Geng ◽  
Jia Ge ◽  
Haifang Liu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Fluorescent Probe ◽  
Carbon Dots ◽  
Turn On ◽  
Specific Determination ◽  
Ascorbic Acid Detection

A rapid turn-on fluorescent probe is proposed for the sensitive and specific determination of ascorbic acid based on carbon dots–MnO2 nanocomposites.

scholarly journals Synthesis and Optical Characterization of Carbon Dot from Peels of Dragon Fruit and Pear

2018 ◽  
Vol 4 (1) ◽  
pp. 19 ◽  
Author(s):  
Selvy Uftovia Hepriyadi ◽  
. Isnaeni
Keyword(s):  
Carbon Dots ◽  
Optical Characterization ◽  
Heating Time ◽  
Emission Wavelength ◽  
Time Resolved ◽  
Carbon Dot ◽  
Infrared Wavelength ◽  
Dragon Fruit ◽  
Time Changes

Fluorescence materials such as carbon dots are unique and non-toxic materials that can be produced using many methods. In this research, synthesis and optical characterization of carbon dots from the peels of dragon fruit and pear have been done. The synthesis uses bottom-up method using microwave with 20 minutes, 40 minutes, and 80 minutes of heating time. The result of optical characterizations showed that the samples that have been heat treated are carbon dots based of the absorbance in the range of 280-350 nm, and the intensity are decreased in the range of visible and infrared wavelength. There are emission and intensity changes by different heat treatments. From the samples of dragon fruit's peels, the emission wavelength tended to shift toward visible light at the wavelength of 551.51 nm, 507.98 nm and 487.28 nm with the excitation at the wavelength of 420 nm from pulsed pico-laser. While, the emission wavelength from the samples of pears peels were fluctuate in wavelength of 529.09 nm, 507.52 nm and 519.46 nm. Similarly, the time-resolved photoluminescence characterization test showed that there were time changes in each sample of carbon dot. The decay lifetime of carbon dots was fluctuated between 4.5 ns - 5.4 ns for dragon fruit’s peels and about 1.9 ns - 2.4 ns for pear's peels.

N,S co-doped carbon dots based fluorescent “on-off-on” sensor for determination of ascorbic acid in common fruits

2018 ◽  
Vol 258 ◽  
pp. 214-221 ◽  
Author(s):  
Xueli Luo ◽  
Wengang Zhang ◽  
Yong Han ◽  
Xiumei Chen ◽  
Li Zhu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Carbon Dots ◽  
Doped Carbon Dots ◽  
Co Doped

Near-Infrared Emitting Dual-Stimuli-Responsive Carbon Dots from Endogenous Bile Pigments

Nanoscale ◽  
2021 ◽  
Author(s):  
Parinaz Fathi ◽  
Parikshit Moitra ◽  
Madeleine M. McDonald ◽  
Mandy Brigitte Esch ◽  
Dipanjan Pan
Keyword(s):  
Surface Modification ◽  
Carbon Dots ◽  
Biomedical Applications ◽  
Near Infrared ◽  
Bile Pigments ◽  
Careful Selection ◽  
Stimuli Responsive ◽  
Carbon Dot ◽  
Surface Modification Techniques ◽  
Selection Of

Carbon dots are biocompatible nanoparticles suitable for a variety of biomedical applications. Careful selection of carbon dot precursors and surface modification techniques has allowed for the development of carbon dots...

scholarly journals EDTA-bonded multi-connected carbon-dots and their Eu3+ complex: preparation and optical properties

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10645-10650 ◽  
Author(s):  
Tianhao Ji ◽  
Peidong Fan ◽  
Xueli Li ◽  
Zhipeng Mei ◽  
Yongyun Mao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Carbon Dot ◽  
Complex Preparation

EDTA-bonded multi-connected carbon-dots (EDTA–C-dots) were prepared from carbon dot precursors and complexed with Eu3+ to give Eu3+-coordinated EDTA-bonded multi-connected carbon dots (Eu–EDTA–C-dots).

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