碲化镉光电
量子点
肉眼
荧光
柠檬酸
二氧化硫
化学
亮度
色谱法
检出限
分析化学(期刊)
材料科学
纳米技术
无机化学
有机化学
光学
物理
作者
Wei Wang,Yanmin Rao,Xiangyu Zhao,Yi Zhao,Xinyi Min,Yue Wu,Ziyi Jiang,Ting Li,Yinhua Li,Hengye Chen,Wanjun Long,Yuanbin She,Haiyan Fu
出处
期刊:Food Chemistry
[Elsevier]
日期:2024-02-01
卷期号:: 138791-138791
被引量:4
标识
DOI:10.1016/j.foodchem.2024.138791
摘要
Acid-sensitive CdTe quantum dots-loaded alginate hydrogel (CdTe QDs-AH) beads were designed for the visual detection of SO2 residues. As proof of concept, two types of CdTe QDs were selected as model probes and embedded in AH beads. The entire test was performed within 25 min in a modified double-layer test tube with one bead fixed above the sample solution. Adding citric acid and heating at 70 ℃ for 20 min transformed the sulfites in the solution into SO2 gas, which then quenched the fluorescence of the CdTe QDs-AH beads. Using this assay, qualitative, naked-eye detection of SO2 residues was achieved in the concentration range of 25–300 ppm, as well as precise quantification was possible based on the difference in the average fluorescence brightness of the beads before and after the reaction. Five food types were successfully analysed using this method, which is simpler and more economical than existing methods, and does not require complex pretreatment.
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