碳量子点荧光猝灭法测定饮料中日落黄  

Fluorescence Quenching Method for Determination of Sunset Yellow in Drinks with Carbon Quantum Dots

作　　者：苏安梅[1] 钟青梅[1] 余姝轶 覃秀 王益林[1] 

机构地区：[1]广西大学化学化工学院广西生物炼制重点实验室,广西南宁530004

出　　处：《发光学报》2017年第4期530-534,共5页Chinese Journal of Luminescence

基　　金：广西自然科学基金(2014GXNSFAA118328);广西生物炼制重点实验室开放基金(GXKLB-2);广西大学大学生创新创业训练计划(201610593162)资助项目~~

摘　　要：以柠檬酸为碳源制备碳量子点(CQDs),所得碳量子点被394 nm的光激发后在484 nm处有较强的荧光发射,最大吸收波长为482 nm的日落黄能强烈猝灭碳量子点的荧光。基于该现象,发展了一种以碳量子点为荧光探针测定日落黄的分析方法,并探讨了荧光猝灭机理。在选定的实验条件下,该分析方法的线性检测范围为0.1~100μmol/L,检出限(3σ/k)为0.051μmol/L。Water-soluble carbon quantum dots（ CQDs） were prepared by using citric acid as carbon source.The obtained CQDs showed a strong emission at the wavelength of 484 nm,with an optimum excitation of 394 nm.Sunset yellow with maximum absorption wavelength at 482 nm could selectively quench the fluorescence of CQDs.Based on this principle,a fluorescent probe was developed for sunset yellow determination.Furthermore,the quenching mechanism of the CQDs was elucidated.A linear relationship was found in the range of 0.1-100 μmol/L sunset yellow with the detection limit（ 3σ/k） of 0.051 μmol/L.Satisfactory results were achieved when the method was submitted to the determination of sunset yellow in liquid samples.

关 键 词：碳量子点 荧光猝灭 日落黄 

分 类 号：O611.4[理学—无机化学]