scholarly journals Microwave-Assisted Synthesis of Amikacin Modified N,S co-Doped Carbon Dots for Escherichia coli Detection

Chemosensors ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 61
Author(s):  
Fajar Amelia Rachmawati Putri ◽  
Mudasir Mudasir ◽  
Kinichi Morita ◽  
Suherman Suherman
Keyword(s):  
Escherichia Coli ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Low Cost ◽  
Microwave Assisted Synthesis ◽  
E Coli ◽  
Microwave Assisted ◽  
Average Size ◽  
Doped Carbon Dots ◽  
Co Doped

Fluorescent amikacin modified nitrogen, sulfur co-doped carbon dots (amikacin modified N,S-CDs) were synthesized by a facile and low-cost one-step microwave-assisted specifically for selective detection of Gram-negative bacteria Escherichia coli (E. coli). Amikacin is a semi-synthetic amino glycoside antibiotic and it was employed in this study to increase the fluorescence response of N,S-CDs by providing binding ligand towards E. coli. The effect of thiourea content as the source of nitrogen and sulfur dopants was investigated prior to the preparation of amikacin modified N,S-CDs. The formation of amikacin modified N,S-CDs were characterized by using Fourier transform infrared (FTIR), X-ray diffraction (XRD), Transmission electron microscope (TEM), UV-Vis spectrophotometer, and spectrofluorometer. Amikacin modified N,S-CDs was identified to be successfully synthesized from the wavenumber shift of the C=O stretching mode. Amikacin modified N,S-CDs were amorphous with an average size of 7 nm. Fluorescence spectra showed that the highest intensity was obtained at thiourea content of 50% and amikacin mass of 25 mg. By comparing fluorescence responses of all the investigated amikacin modified N,S-CDs, the limit of detection (LOD) was attained by 25 mg amikacin modified N,S-CDs at 1.526 cfu mL−1.

One-pot and ultrafast synthesis of nitrogen and phosphorus co-doped carbon dots possessing bright dual wavelength fluorescence emission

Nanoscale ◽  
2015 ◽  
Vol 7 (41) ◽  
pp. 17278-17282 ◽  
Author(s):  
Xiangcheng Sun ◽  
Christian Brückner ◽  
Yu Lei
Keyword(s):  
Carbon Dots ◽  
Fluorescence Emission ◽  
Microwave Assisted Synthesis ◽  
High Quantum Yield ◽  
Green Fluorescence ◽  
Nitrogen And Phosphorus ◽  
One Pot ◽  
Microwave Assisted ◽  
Doped Carbon Dots ◽  
Co Doped

Microwave-assisted synthesis of nitrogen and phosphorus co-doped carbon dots with high quantum yield and dual (blue and green) fluorescence emission.

Microwave-assisted synthesis of nitrogen doped carbon dots using prickly pear as the carbon source and its application as highly selective sensor for Cr(VI) and as patterning agent

2021 ◽  
Author(s):  
Shreya Bhatt ◽  
Gaurav Vyas ◽  
Parimal Paul
Keyword(s):  
Carbon Dots ◽  
Microwave Assisted Synthesis ◽  
Nitrogen Doped ◽  
Water Dispersible ◽  
Microwave Assisted ◽  
Bio Imaging ◽  
Natural Carbon ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon ◽  
Selective Sensor

Preparation of water dispersible carbon dots from inexpensive natural carbon precursors and its application for purposes such as sensing, bio-imaging, patterning agent etc. is showing growing interest in recent years....

Facile synthesis of N,B-co-doped carbon dots with the gram-scale yield for detection of iron (III) and E. coli

2020 ◽  
Vol 31 (39) ◽  
pp. 395702
Author(s):  
Lixia Zhang ◽  
Zishu Zhang ◽  
Zhiwen Gao ◽  
Yan Xie ◽  
Shuang Shu ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Facile Synthesis ◽  
E Coli ◽  
Doped Carbon Dots ◽  
Co Doped

Microwave assisted synthesis of gold nanoparticles and their antibacterial activity against Escherichia coli (E. coli)

2011 ◽  
Vol 11 (1) ◽  
pp. S360-S363 ◽  
Author(s):  
Nishat Arshi ◽  
Faheem Ahmed ◽  
Shalendra Kumar ◽  
M.S. Anwar ◽  
Junqing Lu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Gold Nanoparticles ◽  
Antibacterial Activity ◽  
Microwave Assisted Synthesis ◽  
E Coli ◽  
Microwave Assisted

Microwave-assisted synthesis of N,P-doped carbon dots for fluorescent cell imaging

2015 ◽  
Vol 183 (2) ◽  
pp. 821-826 ◽  
Author(s):  
Hua Li ◽  
Fang-Qi Shao ◽  
Si-Yuan Zou ◽  
Qi-Jing Yang ◽  
Hong Huang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Cell Imaging ◽  
Microwave Assisted Synthesis ◽  
Fluorescent Cell ◽  
Microwave Assisted ◽  
Doped Carbon Dots

scholarly journals Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3470
Author(s):  
Thi Hoa Le ◽  
Hyun Jong Lee ◽  
Ji Hyeon Kim ◽  
Sang Joon Park
Keyword(s):  
Carbon Dots ◽  
Fluorescence Quantum Yield ◽  
Limit Of Detection ◽  
Fluorescence Signal ◽  
Ferric Ions ◽  
Nitrogen And Phosphorus ◽  
Fluorescence Detector ◽  
Sensing System ◽  
Doped Carbon Dots ◽  
Co Doped

Carbon dots (CDs) demonstrate very poor fluorescence quantum yield (QY). In this study, with the help of a hydrothermal method, we combined CDs with nitrogen and phosphorus elements belonging to the VA group (in the periodic table) to form heteroatom co-doped CDs, i.e., nitrogen and phosphorus co-doped carbon dots (NPCDs). These displayed a significant improvement in the QY (up to 84%), which was as much as four times than that of CDs synthesized by the same method. The as-prepared NPCDs could be used as an “off-on” fluorescence detector for the rapid and effective sensing of ferric ions (Fe3+) and catecholamine neurotransmitters (CNs) such as dopamine (DA), adrenaline (AD), and noradrenaline (NAD). The fluorescence of NPCDs was “turned off” and the emission wavelength was slightly red-shifted upon increasing the Fe3+ concentration. However, when CNs were incorporated, the fluorescence of NPCDs was recovered in a short response time; this indicated that CN concentration could be monitored, relying on enhancing the fluorescence signal of NPCDs. As a result, NPCDs are considered as a potential fluorescent bi-sensor for Fe3+ and CN detection. Particularly, in this research, we selected DA as the representative neurotransmitter of the CN group along with Fe3+ to study the sensing system based on NPCDs. The results exhibited good linear ranges with a limit of detection (LOD) of 0.2 and 0.1 µM for Fe3+ and DA, respectively.

scholarly journals Microwave Assisted Synthesis and Optical Properties of Highly Fluorescent N-Doped Carbon Dots

2019 ◽  
Vol 31 (12) ◽  
pp. 2897-2902
Author(s):  
D. Koteswararao ◽  
B. Rajkumar ◽  
K. Prameela ◽  
K. Ashok ◽  
G. Sridevi
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Irradiation Time ◽  
Guanidine Hydrochloride ◽  
Fluorescence Emission ◽  
Microwave Assisted Synthesis ◽  
Solid State Method ◽  
Microwave Assisted ◽  
Wide Range ◽  
Doped Carbon Dots

Herein, a rapid microwave assisted solid state method is reported for the synthesis of highly fluorescent N-doped carbon dots (NCDs) using citric acid as carbon source and guanidine hydrochloride as N-dopant. Synthetic parameters such as microwave power, irradiation time and reactants ratio were optimized to produce high quality N-doped carbon dots. The N-doped carbon dots were well characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), SEM-EDS, FTIR, UV-visible and fluorescence spectroscopies. N-Doped carbon dots exhibited bright emission with a quantum yield of 11 %. Detailed study of their optical properties revealed their excellent property of resistance to photo bleaching, high ionic strength and solution pH. Further they exhibited excitation dependent emission behaviour, high aqueous solubility and a long shelf life of 60 days. This strong fluorescence emission combined with high stability make N-doped carbon dots a promising fluorescent probe for wide range of applications.

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