Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities

Carbon dots (CDs) were obtained from medicinal turmeric leaves (Curcuma longa) by a facile one-step hydrothermal method and evaluated for their bactericidal activities against two gram-negative; Escherichia coli, Klebsiella pneumoniae, and two gram-positive counterparts; Staphylococcus aureus, S. epidermidis. The CDs exhibited spherical shapes with a mean size of 2.6 nm. The fluorescence spectra of CDs revealed intense fluorescence at λex/em = 362/429 nm with a bright blue color in an aqueous solution. The CDs showed strong photostability under various environmental conditions (pH, salt, and UV-radiation). The complete bactericidal potency of CDs was 0.25 mg/mL for E.coli and S. aureus after 8 h of exposure, while for K. pneumoniae, and S. epidermidis, the CDs at 0.5 mg/mL good antibacterial effect within 8 h and complete eradication after 24 h of exposure is observed. The release of reactive oxygen species played a crucial role in the death of the bacterial cell. The present study provides a strategy for the preparation of CDs from a medicinal plant and their potential antibacterial activities against four common contagious pathogens.

Download Full-text

Fe3+ detection, bioimaging, and patterning based on bright blue-fluorescent N-doped carbon dots

The Analyst ◽

10.1039/d0an01042a ◽

2020 ◽

Vol 145 (16) ◽

pp. 5450-5457 ◽

Cited By ~ 3

Author(s):

Lin Li ◽

Lihong Shi ◽

Jing Jia ◽

Dan Chang ◽

Chuan Dong ◽

...

Keyword(s):

Hydrothermal Treatment ◽

Carbon Dots ◽

Cellular Imaging ◽

One Step ◽

Doped Carbon Dots ◽

Bright Blue

The bright blue fluorescent N-doped carbon dots (N-CDs) was successfully fabricated by one-step hydrothermal treatment of astragalus and was exploited for cellular imaging and patterning.

Download Full-text

Article title One-step Synthesis of Blue-green Luminescent Carbon Dots by a Low-temperature Rapid Method and Their High-performance Antibacterial Effect and Bacterial Imaging

Nanotechnology ◽

10.1088/1361-6528/abd8b0 ◽

2021 ◽

Author(s):

Dan Zhao ◽

Rui Zhang ◽

Xuemei Liu ◽

Xianju Huang ◽

Xincai Xiao ◽

...

Keyword(s):

Low Temperature ◽

Rapid Method ◽

Carbon Dots ◽

High Performance ◽

Antibacterial Effect ◽

Article Title ◽

One Step ◽

Title One

Download Full-text

The Preparation of Green Fluorescence-Emissioned Carbon Dots/Poly(N-Isopropylacrylamide) Temperature-Sensitive Hydrogels and Research on Their Properties

Polymers ◽

10.3390/polym11071171 ◽

2019 ◽

Vol 11 (7) ◽

pp. 1171 ◽

Cited By ~ 4

Author(s):

Dan Zhao ◽

Wenting Ma ◽

Rong Wang ◽

Xinzhou Yang ◽

Jun Li ◽

...

Keyword(s):

Carbon Dots ◽

Fluorescence Spectra ◽

Cell Imaging ◽

Fluorescence Probes ◽

Excitation Wavelength ◽

Temperature Sensitive ◽

Green Fluorescence ◽

Microscope Imaging ◽

One Step ◽

Good Biocompatibility

Fluorescence/temperature-sensitive hydrogels, thanks to their properties in fluorescence and temperature sensitivity, have shown a promising outlook in the fields of drug delivery, cell imaging, etc., and thus become the focus of present research. This paper reports the preparation of green-fluorescence/temperature-sensitive hydrogels through one-step radical polymerization with green fluorescence-emissioned carbon dots as fluorescence probes and N-isopropylacrylamide as a monomer. UV-vis spectra, fluorescence spectra, and fluorescence microscope imaging have been used to characterize the prepared hydrogel, and to study their optical and temperature-sensitive properties. It was discovered that the emission of prepared hydrogel is excitation wavelength-dependent, pH responding, and excellent temperature-sensitive, as well as having good biocompatibility. The prepared hydrogel can also be applied as fluorescence ink in the fields of anti-counterfeit identification and appraisal.

Download Full-text

The Preparation of Fluorescent Fibers from FCNPs and Calcium Alginate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.721.63 ◽

2013 ◽

Vol 721 ◽

pp. 63-66

Author(s):

Yu Xi Zhang ◽

Zhi Hui Zhao ◽

Wen Xu ◽

Ruo Cai Pan ◽

Yan Zhi Xia

Keyword(s):

Calcium Alginate ◽

Carbon Nanoparticles ◽

Water Solubility ◽

Fiber Strength ◽

Wet Spinning ◽

Blue Color ◽

One Step ◽

Alginate Fibers ◽

Fluorescent Carbon Nanoparticles ◽

Bright Blue

Stable fluorescent carbon nanoparticles (FCNPs) with excellent water-solubility were prepared firstly by one-step ultrasonic treatment from the blending of glucose and sodium hydroxide. Then, the fluorescence calcium alginate fibers were successfully prepared through wet spinning, using the mixture of FCNPs and sodium alginate solution as the spinning dope. The fluorescent property of FCNPs and fibers were investigated using fluorescence spectrophotometer. Single fiber strength tester was used to measure the strength of the fluorescence fibers. The results showed that both FCNPs and fibers emitted bright blue color under 350nm wavelength UV irradiation. The strength of the fibers was improved when the content of FCNPs in the fibers achieved certain value.

Download Full-text

Simple and Green Synthesis of Boron-, Sulfur-, and Nitrogen-Co-Doped Carbon Dots as Fluorescent Probe for Selective and Sensitive Detection of Sunset Yellow

NANO ◽

10.1142/s1793292017501235 ◽

2017 ◽

Vol 12 (10) ◽

pp. 1750123 ◽

Cited By ~ 7

Author(s):

Ying Huang ◽

Zhengjun Cheng

Keyword(s):

Carbon Dots ◽

Sensitive Detection ◽

Sunset Yellow ◽

Transmission Electron ◽

One Step ◽

Water Dispersibility ◽

Doped Carbon Dots ◽

Electron Microscope Image ◽

Bright Blue ◽

Co Doped

Herein, we have reported the synthesis of boron-, sulfur-, and nitrogen-co-doped carbon dots (B/S/N-CDs) by one-step hydrothermal method using D-([Formula: see text])-maltose monohydrate, boracic acid, and thiocarbamide as the precursors. The prepared B/S/N-CDs possess good water dispersibility, excellent pH stabilities, and resistance to photobleaching. Furthermore, the transmission electron microscope image indicates that the B/S/N-CDs are homogeneously spherical and show good dispersion. Noticeably, the B/S/N-CDs show bright blue photoluminescence with a quantum yield of 8.9% in aqueous solution and can be used as a potent photoluminescent probe for selective and sensitive detection of sunset yellow (SY). Compared with other food colors, SY can dramatically quench the fluorescence of B/S/N-CDs. Meanwhile, the fluorescence intensity displays a good linear response with SY concentration in the range of 0–70[Formula: see text][Formula: see text]M ([Formula: see text]) and the detection limit is as low as 4.65[Formula: see text]nM. The B/S/N-CDs can also be applied for the detection of SY in mineral water and business drink with satisfactory recovery. Our study has demonstrated that the B/S/N-CDs may have wide application values in medical detection, environmental monitoring, and related researches.

Download Full-text

Carbon Dots for Bacterial Detection and Antibacterial Applications-A Minireview

Current Pharmaceutical Design ◽

10.2174/1381612825666191216150948 ◽

2020 ◽

Vol 25 (46) ◽

pp. 4848-4860 ◽

Cited By ~ 2

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.

Download Full-text

One-step green synthesis of ZnO nanoparticles using Opuntia humifusa fruit extract and their antibacterial activities

Materials Today Proceedings ◽

10.1016/j.matpr.2021.03.409 ◽

2021 ◽

Author(s):

M. Chennimalai ◽

V. Vijayalakshmi ◽

T.S. Senthil ◽

N. Sivakumar

Keyword(s):

Green Synthesis ◽

Zno Nanoparticles ◽

Antibacterial Activities ◽

Fruit Extract ◽

Opuntia Humifusa ◽

One Step

Download Full-text

Fast one-step synthesis of N-doped carbon dots by pyrolyzing ethanolamine

Journal of Materials Chemistry C ◽

10.1039/c4tc01139b ◽

2014 ◽

Vol 2 (36) ◽

pp. 7477-7481 ◽

Cited By ~ 99

Author(s):

Xinwei Dong ◽

Yanjie Su ◽

Huijuan Geng ◽

Zhongli Li ◽

Chao Yang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Carbon Dots ◽

High Yield ◽

One Step ◽

Doped Carbon Dots

N-doped CDs can be obtained directly with high yield by pyrolyzing ethanolamine in air within just 7 minutes with the assistance of hydrogen peroxide.

Download Full-text

Occurrence of the Isopod Iridovirus in European Armadillidium and Porcellio (Crustacea, Isopoda)

Bijdragen tot de Dierkunde ◽

10.1163/26660644-05502007 ◽

1985 ◽

Vol 55 (2) ◽

pp. 280-282 ◽

Cited By ~ 4

Author(s):

George O. Poinar ◽

Roberta T. Hess ◽

Jan H. Stock

Keyword(s):

The Netherlands ◽

First Record ◽

Blue Color ◽

Porcellio Scaber ◽

Terrestrial Isopods ◽

Armadillidium Vulgare ◽

Bright Blue

First record of iridovirus infections of terrestrial isopods (Armadillidium vulgare and Porcellio scaber) in Europe (The Netherlands). Infested specimens can be detected by their bright blue color.

Download Full-text