Starch-Based Carbon Dots for Nitrite and Sulfite Detection

Abstract

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-.

Detection of sulphur(ii) of carbon dots synthesized from Gardenia residue

“…3c). 29 According to the abovementioned results, the CDs contained amino, carboxyl, carbonyl, amide and other functional groups, which could react with metal ions to form a relatively stable chelate. Additionally, it was demonstrated that the CDs possessed strong hydrophilicity.…”

Research progress in the synthesis and biological application of quantum dots

“…There are many options for synthesizing CQDs, in which a variety of precursors are used as the carbon source. Various raw materials from biomass have been reported in the literature, which include Tinospora cordifolia leaves, 180 oil palm biomass, 181 areca leaves, 182 corn straw shells, 183 shrimp shells, 184 lemon juice, 185 bread, 186 carrots, 187 gourds, 188 banana peel, 189 starch, 190 Mexican mint leaves, 191 maple leaves, 192 etc. However, the low quantum yield of carbon quantum dots limits their application in many fields, and some studies have been devoted to overcoming this limitation and improving the function of CQDs.…”

Fabrication of a Disposable Amperometric Sensor for the Determination of Nitrite in Food

“…Therefore, monitoring whether the amount of nitrite in food is excessive is essential to protect human health, requiring the accurate and timely monitoring of nitrite in food samples. Some methods for the determination of nitrite have been proposed in recent years, such as spectrophotometry [ 4 ], the chemiluminescence method [ 5 ], capillary ion chromatography [ 6 ], capillary electrophoresis [ 7 ], the fluorescence method [ 8 ], the electrochemical sensing method [ 9 ], etc. Particularly, the electrochemical sensing method has attracted more attention because of its simple operation, high sensitivity, and rapid response time.…”