scholarly journals Starch-Based Carbon Dots for Nitrite and Sulfite Detection

2021 ◽  
Vol 9 ◽  
Author(s):  
Panyong Wang ◽  
Yan Zhang ◽  
Yulu Liu ◽  
Xinpei Pang ◽  
Pai Liu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Human Health ◽  
Efficient Method ◽  
Redox Reaction ◽  
Carbon Dots ◽  
Environmental Science ◽  
Raw Materials ◽  
Turn On ◽  
Low Cytotoxicity ◽  
Fluorescence Turn On

Nitrite and sulfite play important roles in human health and environmental science, so it is desired to develop a facile and efficient method to evaluate NO2- and SO32- concentrations. In this article, the use of green alternatives with the potential of multi-functionality has been synthesized to detect nitrite and sulfite based on fluorescent probe. The carbon dots (CDs) with starch as only raw materials show fluorescence turn “on-off-on” response towards NO2- and SO32- with the limits of detection of 0.425 and 0.243 μМ, respectively. Once nitrite was present in the solution, the fluorescence of CDs was quenched rapidly due to the charge transfer. When sulfite was introduced, the quenching fluorescence of CDs was effectively recovered because of the redox reaction between NO2- and SO32-, and thus providing a new way for NO2- and SO32- detection. Owing to their excellent analytical characteristics and low cytotoxicity, the “on-off-on” sensor was successfully employed for intracellular bioimaging of NO2- and SO32-.

A benzothiazole-based fluorescence turn-on sensor for copper(II)

2021 ◽  
Author(s):  
Gyeongjin Kim ◽  
Donghwan Choi ◽  
Cheal Kim
Keyword(s):  
Charge Transfer ◽  
Limit Of Detection ◽  
Theoretical Calculations ◽  
Enhanced Fluorescence ◽  
Turn On ◽  
Fluorescent Response ◽  
Chelation Enhanced Fluorescence ◽  
Fluorescence Turn On ◽  
Internal Charge Transfer ◽  
Internal Charge

Abstract A new benzothiazole-based chemosensor BTN (1-((Z)-(((E)-3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazono)methyl)naphthalen-2-ol) was synthesized for the detection of Cu2+. BTN could detect Cu2+ with “off-on” fluorescent response from colorless to yellow irrespective of presence of other cations. Limit of detection for Cu2+ was determined to be 3.3 µM. Binding ratio of BTN and Cu2+ turned out to be a 1:1 with the analysis of Job plot and ESI-MS. Sensing feature of Cu2+ by BTN was explained with theoretical calculations, which might be owing to internal charge transfer and chelation-enhanced fluorescence processes.

Supramolecular Self-Assembly of Nitro-incorporated Quinoxaline Framework: Insights into the Origin of Fluorescence Turn-on Response towards Benzene group of VOCs

The Analyst ◽  
2021 ◽  
Author(s):  
Megha Basak ◽  
Gopal Das
Keyword(s):  
Volatile Organic Compounds ◽  
Human Health ◽  
Organic Compounds ◽  
Self Assembly ◽  
Turn On ◽  
Volatile Organic ◽  
Fluorescence Turn On

Hazardous volatile organic compounds (VOCs) can significantly impact human health and the environment. Hence, the detection of VOCs has become foremost important. Quinoxaline-based fluorimetric probe (1) unveils a notable “Turn-On”...

scholarly journals A Review of Carbon Dots Produced from Biomass Wastes

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2316
Author(s):  
Chao Kang ◽  
Ying Huang ◽  
Hui Yang ◽  
Xiu Fang Yan ◽  
Zeng Ping Chen
Keyword(s):  
Carbon Dots ◽  
Raw Materials ◽  
Low Cost ◽  
Disease Diagnosis ◽  
Good Choice ◽  
Biomass Waste ◽  
Renewable Raw Materials ◽  
Wide Availability ◽  
Low Cytotoxicity ◽  
Synthetic Approaches

The fluorescent carbon dot is a novel type of carbon nanomaterial. In comparison with semiconductor quantum dots and fluorescence organic agents, it possesses significant advantages such as excellent photostability and biocompatibility, low cytotoxicity and easy surface functionalization, which endow it a wide application prospect in fields of bioimaging, chemical sensing, environmental monitoring, disease diagnosis and photocatalysis as well. Biomass waste is a good choice for the production of carbon dots owing to its abundance, wide availability, eco-friendly nature and a source of low cost renewable raw materials such as cellulose, hemicellulose, lignin, carbohydrates and proteins, etc. This paper reviews the main sources of biomass waste, the feasibility and superiority of adopting biomass waste as a carbon source for the synthesis of carbon dots, the synthetic approaches of carbon dots from biomass waste and their applications. The advantages and deficiencies of carbon dots from biomass waste and the major influencing factors on their photoluminescence characteristics are summarized and discussed. The challenges and perspectives in the synthesis of carbon dots from biomass wastes are also briefly outlined.

Near-infrared carbon dots-based fluorescence turn on aptasensor for determination of carcinoembryonic antigen in pleural effusion

2019 ◽  
Vol 1068 ◽  
pp. 52-59 ◽  
Author(s):  
Kang Shao ◽  
Lanfang Wang ◽  
Yingting Wen ◽  
Tao Wang ◽  
Yuanjie Teng ◽  
...  
Keyword(s):  
Pleural Effusion ◽  
Carcinoembryonic Antigen ◽  
Carbon Dots ◽  
Near Infrared ◽  
Turn On ◽  
Fluorescence Turn On

scholarly journals A Carbon Dots-based Fluorescence Turn-on Method for DNA Determination

2011 ◽  
Vol 27 (3) ◽  
pp. 243 ◽  
Author(s):  
WenJun BAI ◽  
HuZhi ZHENG ◽  
YiJuan LONG ◽  
XiaoJiao MAO ◽  
Mei GAO ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Turn On ◽  
Fluorescence Turn On
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