scholarly journals Phosphorous-doped green-emission fluorescent carbon dots sensing for pH, lemon yellow and the antioxidant application

2019 ◽  
Author(s):  
Xiaoliang Hao ◽  
Shujuan Dai ◽  
Zhigang Fang ◽  
Jing Guo ◽  
Yingxue Teng
Keyword(s):  
Hydroxyl Radicals ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Pure Water ◽  
Green Emission ◽  
Hydrothermal Carbonization ◽  
Single Step ◽  
Lemon Yellow ◽  
Superoxide Anions ◽  
Fluorescent Carbon Dots

    In this paper, we reported green-emission carbon dots (CDs) using a single step hydrothermal carbonization. The CDs were prepared by m-phenylenediamine, tris, phosphoric acid, and pure water by heating for 8 h at 180 ℃. The CDs exhibited green-emission fluorescence, were sensitive to pH, and was successfully used analysed the pH of real water samples. Besides, the CDs could detect of food additive lemon yellow, with the limit of detection as low as 0.13 μM. More importantly, the CDs could be used as an antioxidant to remove superoxide anions (O2-) and hydroxyl radicals (–OH). The linear range of CDs concentrations for superoxide anion and hydroxyl radicals were 0 - 300 mg/mL and 0 - 14 mg/mL, respectively. In addition, the CDs could be a fluorescnet reagent in bioimaging of beer yeast, mould and onion skins. The favorable pH, optical properties, antioxidant ability, and bioimaging ability ensure the CDs can be exploited in food analysis and other fields.

scholarly journals Flow Injection Photosensitized Chemiluminescence of Luminol with Cu(II)-Rose Bengal: Mechanistic Approach and Vitamin A and C Determination

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Muhammad Asgher ◽  
Mohammad Yaqoob ◽  
Abdul Nabi ◽  
Ghulam Murtaza ◽  
Abdul Rauf Siddiqi ◽  
...  
Keyword(s):  
Hydroxyl Radicals ◽  
Flow Injection ◽  
Rose Bengal ◽  
Limit Of Detection ◽  
Pharmaceutical Formulations ◽  
Enhancement Effect ◽  
Superoxide Anions ◽  
Relative Standard ◽  
Vitamins A And C ◽  
Flow Injection Chemiluminescence

Rose Bengal photosensitized flow injection chemiluminescence method is reported using luminol-Cu(II) for the determination of vitamins A and C in pharmaceutical formulations. The reaction is based on the enhancement effect of analyte in the production of anion radicals of Rose Bengal (RB•−) which rapidly interact with dissolved oxygen and generate superoxide anions radicals (O2•−) and hydrogen peroxide (H2O2). Highly reactive hydroxyl radicals (•OH) were produced via dismutation of H2O2by catalyst (Cu2+). The generated superoxide anions radicals and hydroxyl radicals thus oxidize luminol in alkaline medium to generate strong chemiluminescence. The limit of detection (3sof the blank,n=6) of vitamins A and C and RB was found to be 0.008, 0.005, and 0.05 μg mL−1, respectively. The sample throughput of 70 h−1for vitamins A and C and 30 h−1for RB was found. Calibration curve was linear in the range of 0.05–15, 0.01–20, and 0.1–50 μg mL−1for vitamins A and C and RB, respectively, with relative standard deviations (RSDs;n=3) in the range 1.6–3.6%. The method was successfully applied to pharmaceutical formulations and the results obtained were in good agreement with the labeled values.

Surfactant-Based Fluorescent Quantum Carbon Dots: Synthesis and Application

2015 ◽  
Vol 1088 ◽  
pp. 381-385 ◽  
Author(s):  
Sandra Štěpánková ◽  
Ondřej Kozák ◽  
Radek Zbořil
Keyword(s):  
Fluorescence Quenching ◽  
Carbon Dots ◽  
Quantitative Method ◽  
Colloidal Stability ◽  
High Selectivity ◽  
Cetylpyridinium Chloride ◽  
Hydrothermal Carbonization ◽  
Fluorescent Carbon Dots

In this work I present fluorescent carbon dots (CDs) prepared by facile and inexpensive synthesis by hydrothermal carbonization from cationic surfactant cetylpyridinium chloride (CPC). These CDs show tunable photoluminescence as well as long-term colloidal stability. Moreover, CDs exhibit high selectivity and sensitivity towards Fe3+ions. Therefore a specific quantitative method is proposed for the determination of Fe3+ions based on fluorescence quenching of CDs.

scholarly journals Spectrophotofluorometric Study of Amaranth with Fluorescent Carbon Dots and its Analytical Application

2021 ◽  
Vol 33 (9) ◽  
pp. 2015-2020
Author(s):  
Amandeep Kaur ◽  
Usha Gupta
Keyword(s):  
Aqueous Solution ◽  
Carbon Source ◽  
Carbon Dots ◽  
Present Method ◽  
Hydrothermal Carbonization ◽  
Time Period ◽  
Fluorescent Carbon Dots ◽  
Effect Time ◽  
Fluorescent Carbon

Hydrothermal carbonization of bottle gourd as the carbon source has been performed to synthesize fluorescent carbon dots . The carbon dots were formed in the form of yellow brown aqueous solution, soluble in water and stable towards light. Characterization of fluorescent carbon dots was done using TEM, UV-vis and fluorescence spectroscopy. Spectrophotofluorometric method has been followed for the study of common food colorant Amaranth present in foodstuffs using fluorescent carbon dots. Conditions optimized during analysis were reaction pH, concentration of Amaranth, concentration of C-dots, thermal effect, time period, etc. Results showed that Amaranth could result in fluorescence quenching of carbon dots due to interaction of surface –COOH, –SO3H group with Amaranth dye. The present method offers good linear range of 0.20-25.0 μM with LOD 0.019 μM and highly selective and therefore, method have been applied successfully for the detection of Amaranth in foodstuffs.

scholarly journals A Review of Fluorescent Carbon Dots, Their Synthesis, Physical and Chemical Characteristics, and Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1448
Author(s):  
Mychele Jorns ◽  
Dimitri Pappas
Keyword(s):  
Carbon Dots ◽  
Hydrothermal Carbonization ◽  
Quantitative Information ◽  
Fluorescent Imaging ◽  
Excitation Wavelength ◽  
Cell Type ◽  
Different Types ◽  
Biological Environment ◽  
Physical And Chemical ◽  
Fluorescent Carbon Dots

Carbon dots (CDs) are a particularly useful type of fluorescent nanoparticle that demonstrate biocompatibility, resistance to photobleaching, as well as diversity in composition and characteristics amongst the different types available. There are two main morphologies of CDs: Disk-shaped with 1–3 stacked sheets of aromatic carbon rings and quasi-spherical with a core-shell arrangement having crystalline and amorphous properties. They can be synthesized from various potentially environmentally friendly methods including hydrothermal carbonization, microwaving, pyrolysis or combustion, and are then purified via one or more methods. CDs can have either excitation wavelength-dependent or -independent emission with each having their own benefits in microscopic fluorescent imaging. Some CDs have an affinity for a particular cell type, organelle or chemical. This property allows the CDs to be used as sensors in a biological environment and can even provide quantitative information if the quenching or intensity of their fluorescence is dependent on the concentration of the analyte. In addition to fluorescent imaging, CDs can also be used for other applications including drug delivery, quality control, photodynamic therapy, and photocatalysis.

scholarly journals Highly fluorescent carbon dots as an efficient nanoprobe for detection of clomifene citrate

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 6084-6093 ◽  
Author(s):  
Yi Zhang ◽  
Zhiyong Gao ◽  
Xue Yang ◽  
Genqing Yang ◽  
Jiuli Chang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Hydrothermal Carbonization ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Highly fluorescent carbon dots (CDs) were synthesized through facile hydrothermal carbonization and ethylenediamine passivation of an easily available prawn shell precursor.

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe3+ Ions and Anti-Counterfeiting Inks

NANO ◽  
2018 ◽  
Vol 13 (08) ◽  
pp. 1850097 ◽  
Author(s):  
Chonghui Fan ◽  
Kelong Ao ◽  
Pengfei Lv ◽  
Jiancheng Dong ◽  
Di Wang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Water Solubility ◽  
Fluorescence Probe ◽  
Limit Of Detection ◽  
Single Step ◽  
Nitrogen Doped ◽  
Ambient Lighting ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Fluorescent nitrogen-doped carbon dots (N-CDs) with excellent stability were prepared via single-step hydrothermal carbonization of citric acid (CA) and ethylenediamine (EDA). The as-prepared N-CDs emit blue fluorescence under the excitation of 365[Formula: see text]nm and have a size distribution of 2.80 ± 0.47[Formula: see text]nm with benign size effect. The structure and morphology were further characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. It was found that the surface of the N-CDs was successfully functionalized, which presented water solubility and chelation with Fe3+. XRD results display a diffraction peak at 23.9°C, which corresponds to the (002) interlayer spacing of a graphitic structure revealing an amorphous carbon phase. Furthermore, due to good sensitivity, N-CDs were used as probes for Fe3+ detection. The low limit of detection of 0.6[Formula: see text]μM as a fluorescence probe was successfully obtained based on the linear relationship between ([Formula: see text] and concentration of Fe3+ ions. Besides the satisfactory fluorescence, PVA/N-CDs membranes and fluorescent inks demonstrate potential for anti-counterfeiting applications due to its characteristic flexibility, transparency, removability and invisibility under ambient lighting.

Synthesis of Ultra-Stable Fluorescent Carbon Dots from Polyvinylpyrrolidone and Their Application in the Detection of Hydroxyl Radicals

2014 ◽  
Vol 9 (4) ◽  
pp. 1054-1059 ◽  
Author(s):  
Xiangling Ren ◽  
Jing Liu ◽  
Xianwei Meng ◽  
Jianfei Wei ◽  
Tianlong Liu ◽  
...  
Keyword(s):  
Hydroxyl Radicals ◽  
Carbon Dots ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

scholarly journals One Step Synthesis of Fluorescent Carbon Dots and its Potential Application in pH Detection, Food Additives and Free Radical Scavenging

2021 ◽  
pp. X
Author(s):  
Xiaoliang HAO ◽  
Shujuan DAI ◽  
Zhigang FANG ◽  
Jing GUO ◽  
Yingxue TENG
Keyword(s):  
Carbon Dots ◽  
Food Additives ◽  
Synthesis Method ◽  
Radical Scavenging ◽  
Lemon Yellow ◽  
Step Method ◽  
Potential Applications ◽  
One Step ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Lemon yellow is a kind of common food additive. Excessive use of food additives and metabolized free radicals in blood may bring potential harm to human health. In this study, we synthesized a kind of green luminescent fluorescent carbon dots by one-step method, which can effectively detect lemon yellow and this kind of material is sensitive to pH. More importantly, this material can effectively remove superoxide anion and hydroxyl radical. The synthesis method is simple and some unique functions will make this material have greater potential applications.

Nitrogen-doped carbon dots from Hutai-8 grape skin and their application in Hg2+ detection

2020 ◽  
Vol 16 ◽  
Author(s):  
Pan Zhang ◽  
Shun-Sheng Zhao ◽  
JiaJia Wang ◽  
Xiang Rong Liu
Keyword(s):  
Heavy Metal ◽  
Carbon Source ◽  
Fluorescence Quenching ◽  
Hydrothermal Method ◽  
Water Samples ◽  
Carbon Dots ◽  
Mercury Ions ◽  
Grape Skin ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Background: In recent years, environmental pollution and heavy metal pollution caused by rapid urbanization and industrialization have become increasingly serious. Among them, mercury (II) ion (Hg2+) is one of the highly toxic heavy metal ions, and its pollution comes from various natural resources and human activities. Therefore, people attach great importance to the development of analytical methods for effective analysis and sensitive detection of Hg2+ . Objective: Using grape skin as a green and environmental friendly carbon source, to synthesize fluorescent carbon dots, and try to apply them to the detect the concentration of Hg2+ in water. Method: Using "Hutai No. 8" grape skin as carbon source, fluorescent carbon dots were synthesized by one-step hydrothermal method. Structure and fluorescent properties of the carbon dots were tested using TEM, XPS, XRD and other characterization instruments, and their utilization on detection of mercury ions in the actual water samples was explored. Results: The CDs had a particle size of about 4.8 nm and a spherical shape. There are N-H, C-N, C=O and other functional groups on the surface. It was found that Hg2+ has obvious fluorescence quenching effect on CDs, and thus CDs fluorescence quenching method to detect the concentration Hg2+ was established, and the detection limit is 3.7 μM, which could be applied to test the concentration of Hg2+ in water samples. Conclusion: Using grape skin as carbon source, fluorescent carbon dots were successfully synthesized by hydrothermal method. Carbon dots were used to detect mercury ions in water, and a method for detecting mercury ions in actual water samples was established.

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

Optik ◽  
2021 ◽  
pp. 166449
Author(s):  
Woo Tae Hong ◽  
Jin Young Park ◽  
Jong Won Chung ◽  
Hyun Kyoung Yang ◽  
Jae-Yong Je
Keyword(s):  
Carbon Dots ◽  
Coffee Grounds ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon
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