A green one-pot synthesis of nitrogen and sulfur co-doped carbon quantum dots for sensitive and selective detection of cephalexin

2017 ◽  
Vol 95 (6) ◽  
pp. 641-648 ◽  
Author(s):  
Farhad Akhgari ◽  
Naser Samadi ◽  
Khalil Farhadi ◽  
Mehrdad Akhgari
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Selective Detection ◽  
Photoluminescence Intensity ◽  
Doped Carbon Dots ◽  
Co Doped

The article reports a simple, economic, and green method for preparing water-soluble, nitrogen and sulfur co-doped carbon quantum dots via a one-step hydrothermal method. Pomegranate juice served as the carbon source, and the L-cysteine provided nitrogen and sulfur. Co-doped carbon dots were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy techniques. The co-doped carbon dots served as fluorescent probes for sensitive and selective detection of cephalexin. Briefly, the co-doped carbon dot systems showed quenching of photoluminescence intensity in the presence of cephalexin. The decrease of fluorescence intensity made it possible to analyze cephalexin with satisfactory detection limits and linear ranges. The Sterne–Volmer plot showed a linear relationship (R2 = 0.998) between F0/F and the concentration of cephalexin over the range from 0.3 to 10 μmol L−1. The limit of detection (LOD) was estimated to be 1 × 10−7 mol L−1 (at a signal to noise ratio of 3). To validate the applicability, the described method was successfully applied for the detection of cephalexin in human urine and raw milk samples.

An “on–off–on” fluorescent nanoprobe for recognition of Cu2+ and GSH based on nitrogen co-doped carbon quantum dots, and its logic gate operation

2019 ◽  
Vol 11 (20) ◽  
pp. 2650-2657 ◽  
Author(s):  
Yifang Gao ◽  
Huilin Zhang ◽  
Shaomin Shuang ◽  
Hui Han ◽  
Chuan Dong
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Logic Gate ◽  
Carbon Quantum Dots ◽  
Gate Operation ◽  
Fluorescent Nanoprobe ◽  
Highly Sensitive ◽  
Doped Carbon Dots ◽  
Co Doped

Novel nitrogen co-doped carbon dots (NCDs) were synthesized as a fluorescent “on–off–on” switch for the highly sensitive and selective sensing of Cu2+ and glutathione (GSH) by a straightforward pyrolysis route.

Water-soluble, nitrogen-doped fluorescent carbon dots for highly sensitive and selective detection of Hg2+ in aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 40393-40401 ◽  
Author(s):  
Y. Zhang ◽  
Y. H. He ◽  
P. P. Cui ◽  
X. T. Feng ◽  
L. Chen ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Selective Detection ◽  
One Pot ◽  
Nitrogen Doped ◽  
Highly Sensitive ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon ◽  
Fluorescent Carbon Dots

Highly fluorescent water-soluble and nitrogen-doped carbon dots (NCDs) were synthesized by a simple one-pot hydrothermal method using citric acid as carbon source and urea as nitrogen source.

Nitrogen and Sulfur Co-doped Fluorescent Carbon Dots for the Detection of Morin and Cell Imaging

2018 ◽  
Vol 15 (1) ◽  
pp. 47-55
Author(s):  
Xuebing Li ◽  
Haifen Yang ◽  
Ning Wang ◽  
Tijian Sun ◽  
Wei Bian ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Fluorescent Probe ◽  
Fluorescence Intensity ◽  
Carbon Dots ◽  
Cell Imaging ◽  
Water Soluble ◽  
Heating Process ◽  
X Ray ◽  
Doped Carbon Dots ◽  
Co Doped

Background: Morin has many pharmacological functions including antioxidant, anticancer, anti-inflammatory, and antibacterial effects. It is commonly used in the treatment of antiviral infection, gastropathy, coronary heart disease and hepatitis B in clinic. However, researches have shown that morin is likely to show prooxidative effects on the cells when the amount of treatment is at high dose, leading to the decrease of intracellular ATP levels and the increase of necrosis process. Therefore, it is necessary to determine the concentration of morin in biologic samples. Method: Novel water-soluble and green nitrogen and sulfur co-doped carbon dots (NSCDs) were prepared by a microwave heating process with citric acid and L-cysteine. The fluorescence spectra were collected at an excitation wavelength of 350 nm when solutions of NSCDs were mixed with various concentrations of morin. Results: The as-prepared NSCDs were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The fluorescence intensity of NSCDs decreased significantly with the increase of morin concentration. The fluorescence intensity of NSCDs displayed a linear response to morin in the concentration 0.10-30 μM with a low detection limit of 56 nM. The proposed fluorescent probe was applied to analysis of morin in human body fluids with recoveries of 98.0-102%. Conclusion: NSCDs were prepared by a microwave heating process. The present analytical method is sensitive to morin. The quenching process between NSCDs and morin is attributed to the static quenching. In addition, the cellular toxicity on HeLa cells indicated that the as-prepared NSCDs fluorescent probe does not show obvious cytotoxicity in cell imaging. Our proposed method possibly opens up a rapid and nontoxic way for preparing heteroatom doped carbon dots with a broad application prospect.

Microwave synthesis of nitrogen and sulfur co-doped carbon dots for the selective detection of Hg2+ and glutathione

2020 ◽  
Vol 99 ◽  
pp. 109559 ◽  
Author(s):  
Xuebing Li ◽  
Chaofan Chai ◽  
Yulu Zhang ◽  
Yakun Wang ◽  
Junjie Lv ◽  
...  
Keyword(s):  
Microwave Synthesis ◽  
Carbon Dots ◽  
Selective Detection ◽  
Doped Carbon Dots ◽  
Co Doped

Multifunctional N,S co-doped carbon quantum dots with pH- and thermo-dependent switchable fluorescent properties and highly selective detection of glutathione

Carbon ◽  
2016 ◽  
Vol 104 ◽  
pp. 169-178 ◽  
Author(s):  
Zhongqian Song ◽  
Fengyu Quan ◽  
Yuanhong Xu ◽  
Mengli Liu ◽  
Liang Cui ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Selective Detection ◽  
Fluorescent Properties ◽  
Co Doped

Facile synthesis of water-soluble and biocompatible fluorescent nitrogen-doped carbon dots for cell imaging

The Analyst ◽  
2014 ◽  
Vol 139 (7) ◽  
pp. 1692-1696 ◽  
Author(s):  
Weiping Wang ◽  
Ya-Chun Lu ◽  
Hong Huang ◽  
Jiu-Ju Feng ◽  
Jian-Rong Chen ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Cell Imaging ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Low Toxicity ◽  
Good Biocompatibility ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A simple and green hydrothermal method was developed for preparation of water-soluble nitrogen-doped carbon dots (N-CDs) from streptomycin. The prepared N-CDs reveal low toxicity, high stability and good biocompatibility, which can be used as fluorescent probes for cell imaging.

scholarly journals A novel fluorescent sensor based on sulfur and nitrogen co-doped carbon dots with excellent stability for selective detection of doxycycline in raw milk

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12827-12834 ◽  
Author(s):  
Jinping Song ◽  
Jing Li ◽  
Ziying Guo ◽  
Wen Liu ◽  
Qi Ma ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Fluorescent Sensor ◽  
Raw Milk ◽  
Selective Detection ◽  
Sensitivity And Selectivity ◽  
Doped Carbon Dots ◽  
Co Doped ◽  
Excellent Stability

Sulfur and nitrogen co-doped carbon dots obtained from casein exhibited excellent sensitivity and selectivity for the detection of doxycycline.

Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots

2014 ◽  
Vol 38 (9) ◽  
pp. 4615-4621 ◽  
Author(s):  
Ben-Xing Zhang ◽  
Hui Gao ◽  
Xiao-Long Li
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Doped Graphene ◽  
Co Doped

Schematic and digital photos of the preparation for water-soluble nitrogen (N) and sulfur (S) co-doped graphene quantum dots (NS-GQDs). Sulfur enhances the photoluminescence of NS-GQDs.

scholarly journals Synthesis of polyurethane-derived nitrogen-doped carbon dots for a high-performance fluorescence bioimaging probe

RSC Advances ◽  
2021 ◽  
Vol 11 (54) ◽  
pp. 34174-34180
Author(s):  
Fang-Jun Cao ◽  
Lu Wang ◽  
Cheng-Li Feng ◽  
Xiao Lin ◽  
Hui Feng
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Solvothermal Method ◽  
Carbon Quantum Dots ◽  
Soluble Nitrogen ◽  
Nitrogen Doped ◽  
Fluorescence Bioimaging ◽  
Polyurethane Sponge ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A universal and robust strategy using polyurethane sponge as a precursor was developed to synthesize highly-soluble nitrogen-doped carbon quantum dots via a solvothermal method.

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