基于碳量子点的荧光猝灭法检测微量三价铁离子  

Detection of trace iron based on the fluorescence quenching of carbon quantum dots

作　　者：王蓓蓓[1] 王丽[1] 叶华[1] 唐璐子 WANG Bei-bei WANG Li YE Hua TANG Lu-zi(School of Food and Drug, Anhui Science and Technology University, Fengyang 233100)

机构地区：[1]安徽科技学院食品药品学院,凤阳233100

出　　处：《分析试验室》2017年第10期1146-1150,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金项目(31201369;安徽科技学院自然科学研究项目(ZRC2014445);安徽省高校优秀人才支持计划重点项目(gxyq ZD2016219)资助

摘　　要：以碳量子点(CQDS)作为荧光探针,在pH 7.0的PBS缓冲溶液中,建立了一种检测食品中微量Fe^(3+)的荧光猝灭法。以白糖为原料,利用反应釜高温水热反应得到高品质的荧光碳量子点(CQDs)。实验表明体系的荧光猝灭程度与Fe^(3+)含量成线性关系,线性回归方程为Y=54.698X+23.41,相关系数为0.9660,线性范围为10^(-7)~10^(-3)mol/L,检出限6.0 nmol/L。本实验方法已经初步应用于食品样品中Fe^(3+)的检测,其中铁补充剂检测结果与常规方法结果一致,说明了此方法的准确性、可靠性和适用性。In this paper, the detection of trace ferric iron ion （ Fe3＋ ） in food was set up based on the fluorescence quenching of carbon quantum dots （CQDs）. Taking sugar as carbon source, one-step hydrothermal method was used to synthesize the high quality fluorescent CQDs. It has been found that the fluorescence intensity could be well quenched with high specificity. The fluorescence intensity showed linear responses to Fe3＋ in the concentration range from 10-7 to 10-3 moL/L with the detection limit of 6.0 nmol/L （ S/N= 3 ）. The equation of linear regression is Y = 54. 698X ＋ 23.41 with high correlation coefficient （ R2 -- 0. 9660 ）. The method was preliminarily applied to the analysis of food samples for Fe3＋ detection, and the result indicated that the method was accurate, reliable and feasible.

关 键 词：碳量子点 荧光猝灭 三价铁离子 

分 类 号：O657.3[理学—分析化学]