期刊
FOOD CHEMISTRY
卷 374, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.131768
关键词
Red emission; Carbon dots; Nitrite detection; Meat products
资金
- Chinese Universities Scientific Fund [2452021123]
- Talented Program [A279021724]
A novel red emission carbon dots fluorescent probe was developed for dual-mode detection of nitrite, with the ability to perform both convenient colorimetric analysis and accurate fluorometric detection. Upon the addition of NO2-, the color of the solution transitions from rose red to light purple, while the red fluorescence gradually diminishes.
Nitrite (NO2-) is widely present in the human environment and accurate, sensitive and selective detecting of nitrite is of vital significance for food safety and water quality. Herein, a novel red emission carbon dots (r-CDs) fluorescent probe was fabricated for dual-mode detection of nitrite, which was capable of both convenient colorimetric analysis and accurate fluorometric detection. When NO2- is added to the rose-red r-CDs solution, NO2- interacts with the amino groups which on the surface of r-CDs to form diazotized substance, resulting in that the colorimetric color of r-CDs solution realizes the transition from rose red to light purple, and the red fluorescence is gradually quenched. The detection limits of colorimetric and fluorescence for NO2- were 0.193 mu M and 0.149 mu M, respectively. Furthermore, the dual-readout probe revealed satisfactory recovery and reliability when analyzing the concentration of NO2- in ham and bacon samples..
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