scholarly journals Fluorescent N-doped carbon dots from bacterial cellulose for highly sensitive bacterial detection

BioResources ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 78-88
Author(s):  
Shunli Li ◽  
Xin Zhao ◽  
Yujie Zhang ◽  
Honglei Chen ◽  
Yu Liu
Keyword(s):  
Bacterial Cellulose ◽  
Carbon Dots ◽  
High Performance ◽  
Hydrothermal Carbonization ◽  
Excitation Wavelength ◽  
Particle Sizes ◽  
Bacterial Detection ◽  
Highly Sensitive ◽  
Wide Range ◽  
Doped Carbon Dots

Carbon dots have good dispersion capability, strong visible fluorescence, low toxicity, and photo-induced accepting and donating abilities. Carbon dots were obtained from biomass bacterial cellulose (BC) via one-step hydrothermal carbonization. Effects of hydrothermal time and temperature on the microstructure, fluorescence, and excitation wavelength dependent photoluminescence (PL) behavior were explored for the prepared carbon dots. The results showed that the carbon dots obtained directly from the BC (C dots) had small particle sizes (2.0 to 3.0 nm) and green luminescence behavior. Conversely, the N-doped carbon dots (N-C dots) exhibited more uniform and smaller particle sizes (approximately 1.0 nm), strong blue luminescence, acceptable fluorescence lifetime, and good stability in a wide range of pH values (2.0 to 10.0). Thus, carbon dots could serve as a fluorescent material used in high performance optical cellular imaging and highly sensitive bacterial detection.

Carbon Dots for Bacterial Detection and Antibacterial Applications-A Minireview

2020 ◽  
Vol 25 (46) ◽  
pp. 4848-4860 ◽  
Author(s):  
Anisha Anand ◽  
Gopinathan Manavalan ◽  
Ranju Prasad Mandal ◽  
Huan-Tsung Chang ◽  
Yi-Ru Chiou ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Antibacterial Effect ◽  
Bacterial Detection ◽  
High Brightness ◽  
Photo Catalysis ◽  
Wide Range ◽  
Prevention And Treatment ◽  
Low Toxicity ◽  
Conventional Antibiotics

: The prevention and treatment of various infections caused by microbes through antibiotics are becoming less effective due to antimicrobial resistance. Researches are focused on antimicrobial nanomaterials to inhibit bacterial growth and destroy the cells, to replace conventional antibiotics. Recently, carbon dots (C-Dots) become attractive candidates for a wide range of applications, including the detection and treatment of pathogens. In addition to low toxicity, ease of synthesis and functionalization, and high biocompatibility, C-Dots show excellent optical properties such as multi-emission, high brightness, and photostability. C-Dots have shown great potential in various fields, such as biosensing, nanomedicine, photo-catalysis, and bioimaging. This review focuses on the origin and synthesis of various C-Dots with special emphasis on bacterial detection, the antibacterial effect of CDots, and their mechanism.

scholarly journals Anchoring zinc-doped carbon dots on a paper-based chip for highly sensitive fluorescence detection of copper ions

The Analyst ◽  
2021 ◽  
Vol 146 (20) ◽  
pp. 6297-6305
Author(s):  
Qinglan Miao ◽  
Ji Qi ◽  
Yuanyuan Li ◽  
Xinxia Fan ◽  
Dongmei Deng ◽  
...  
Keyword(s):  
Fluorescence Detection ◽  
Carbon Dots ◽  
Active Sites ◽  
Copper Ions ◽  
Fluorescent Detection ◽  
Zn Doping ◽  
Highly Sensitive ◽  
Doped Carbon Dots

A novel paper-based chip that anchored zinc-doped carbon dots was constructed for sensitive and stable fluorescent detection of Cu2+. Zn doping increased the active sites for simplifying the modification of carbon dots.

scholarly journals Correction: Gadolinium-doped carbon dots with high-performance in dual-modal molecular imaging

2021 ◽  
Author(s):  
Le Wang ◽  
Wenjie Zhou ◽  
Dan Yang ◽  
Zhe Hu ◽  
Shiliang Mei ◽  
...  
Keyword(s):  
Molecular Imaging ◽  
Carbon Dots ◽  
High Performance ◽  
Doped Carbon Dots

Correction for ‘Gadolinium-doped carbon dots with high-performance in dual-modal molecular imaging’ by Le Wang et al., Anal. Methods, 2021, 13, 2442–2449, DOI: 10.1039/d1ay00270h.

Fabrication of high-performance luminescent solar concentrators using N-doped carbon dots/PMMA mixed matrix slab

2018 ◽  
Vol 63 ◽  
pp. 237-243 ◽  
Author(s):  
Xiao Gong ◽  
Wenwen Ma ◽  
Yunxia Li ◽  
Lingqi Zhong ◽  
Wenjing Li ◽  
...  
Keyword(s):  
Carbon Dots ◽  
High Performance ◽  
Mixed Matrix ◽  
Solar Concentrators ◽  
Luminescent Solar Concentrators ◽  
Doped Carbon Dots

Simultaneous Direct Analysis of Aflatoxins and Ochratoxin A in Cereals and Their Processed Products by Ultra-High Performance Liquid Chromatography with Fluorescence Detection

2019 ◽  
Vol 102 (6) ◽  
pp. 1666-1672
Author(s):  
Manisha Dhanshetty ◽  
Kaushik Banerjee
Keyword(s):  
Ochratoxin A ◽  
Fluorescence Detection ◽  
High Performance ◽  
Fungal Infections ◽  
Direct Analysis ◽  
Excitation Wavelength ◽  
High Throughput Analysis ◽  
Liquid Chromatograph ◽  
Wide Range ◽  
Single Laboratory

Background: Mycotoxins such as aflatoxins (AFs) and ochratoxin A (OTA) can pose severe health hazards because of their toxicity. Given a wide range of food matrices susceptible to fungal infections and possible cooccurrence of mycotoxins at different concentrations, validated multimycotoxin and multimatrix methods are strongly warranted. Objective: The aim of this research was to develop a simple and fast ultra-high performance LC (UHPLC) fluorescence detection (FLD)–based method to simultaneously determine AFs (B1, G1, B2, and G2) and OTA and, furthermore, to carry out single-laboratory validation in a range of cereals and processed product matrices. Methods: The sample preparation involved homogenization and extraction with methanol–water (80 + 20). For cleanup, an aliquot (3 mL) was diluted with phosphate-buffered saline, loaded on an immunoaffinity column (AFLAOCHRA PREP®), and eluted with methanol (1 mL). The cleaned extract was diluted with 0.2% acetic acid (at a 1:1 ratio) before injection into an ultra-high performance liquid chromatograph. To perform simultaneous analysis of AFs and OTA, the FLD program was developed by switching the excitation wavelength in a single chromatographic run. Results: The method provided LOQs of 0.25 and 1 ng/g for AFs and OTA, respectively, without involving any derivatization. In rice, the recoveries of AFs ranged from 84 to 106%, whereas OTA had a recovery above 72%, with the repeatability relative SDs <12% for both analytes. The method was successfully applied to a range of naturally contaminated market samples. Conclusions: The method is suitable for regulatory testing because of its significant time and cost effectiveness and sensitivity in compliance with the regulatory maximum levels. Highlights: The study achieves high-throughput analysis of AFs and OTA in raw and processed cereals using simultaneous extraction, cleanup, and UHPLC-FLD. Method sensitivity complies with the regulatory maximum levels. Single-laboratory validation results meet analytical QC requirements.

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.

Highly photoluminescent pH-independent nitrogen-doped carbon dots for sensitive and selective sensing of p-nitrophenol

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 15192-15200 ◽  
Author(s):  
Huan Yuan ◽  
Jie Yu ◽  
Suling Feng ◽  
Yijun Gong
Keyword(s):  
Maleic Acid ◽  
Carbon Dots ◽  
Nitrogen Doped ◽  
Highly Sensitive ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Highly photoluminescent pH-independent nitrogen-doped carbon dots prepared from maleic acid and ethylenediamine exhibit highly sensitive and selective sensing of p-nitrophenol.

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