Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8954811 | Food Chemistry | 2019 | 8 Pages |
Abstract
We found that nitrite after protonation can react with amine radical on citric acid/ethylenediamine carbon nanodots (CA/EDA-CDs) to form nitrosamines, and fluorescence quenching of CA/EDA-CDs occurred during this process. Using the reaction mechanism a fluorescence quenching capillary analysis (FQCA) was developed. After optimized reaction conditions, the following results were obtained: the required concentration of CA/EDA-CDs was 12â¯mg/L, HCl concentration was 32â¯mmol/L, and the reaction conducted in room temperature for 20â¯min. Under optimized conditions, FQCA has a linear response in 20-500â¯Î¼g/L in which RSD was less 4.5% (nâ¯=â¯11), the detection limit was 6.5â¯Î¼g/L and the recovery was in 95-105%. The measured results were consistent with the national standard method. FQCA has been used for determining nitrite in foods and nature waters. The capillary in FQCA was used as the container for CA/EDA-CDs/NO2â reaction and NO2â determination, and realized trace-level analysis for micro-volume samples (<10â¯Î¼L/time).
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Bao-Lin Li, Yong-Sheng Li, Xiu-Feng Gao,