摘要
以萘酰亚胺偶氮苯为检测信号基团,以水杨醛为氰根离子的识别基团,通过将萘酰亚胺重氮盐和水杨醛单元偶联,得到基于萘酰亚胺的偶氮苯染料分子探针。研究发现,探针溶液与氰化物反应后,紫外光谱吸收峰从波长404 nm转移至505 nm,颜色从黄色变为红色。在水溶液体系中,探针分子能实现对氰化物的比值式检测,线性范围为0.5~40.0μmol/L,检出限为0.13μmol/L,远低于世界卫生组织规定饮用水中的氰化物最大含量(1.9μmol/L)。且该探针分子具有很强的特异性,对CN^-的检测不受F^-、Cl^-、Br^-、I^-、SCN^-、Ac O^-、S^(2-)、H_2PO_4^-、N_3^-、NO_3^-等共存阴离子的影响。在对实际食物样品中氰化物进行检测时,该方法的准确度与国标方法一致。另外,利用探针分子制备了氰化物的检测试纸,可直接目测出含氰化物浓度大于5.0μmol/L的样品溶液。
In this study,a colorimetric probe was devised and synthesized by coupling a salicylaldehyde moiety,whichacts as a recognition unit,to the naphthalimido diazonium salt(a signal unit)through an azo bond for the detection ofcyanide.After reacting with cyanide,the absorption bands of the probe shifted from404to505nm and the color changedrapidly from yellow to red.The probe allowed ratiometric detection of cyanide in aqueous solution with a linear range of0.5–40.0μmol/L and a limit of detection(LOD)of0.13μmol/L,which is much lower than the maximum contaminantlevel(1.9μmol/L)for cyanide in drinking water set by the World Health Organization.The probe also displayed excellentselectivity for CN-rather than other anions including F?,Cl?,Br?,I?,SCN?,AcO?,S2?,H2PO4?,N3?and NO3?.The methoddeveloped in this study gave the same results as those from the national standard method in real sample detection.In addition,the probe was successfully used to prepare test strips,which can be used to monitor cyanide conveniently,and the discernibleconcentration of cyanide can be as low as5.0μmol/L.
作者
周彬彬
张继红
王芳斌
汪霞丽
戴璇
杨滔
郝远强
ZHOU Binbin;ZHANG Jihong;WANG Fangbin;WANG Xiali;DAI Xuan;YANG Tao;HAO Yuanqiang(Hunan Institute of Food Quality Supervision Inspection and Research, Changsha 410117, China;College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, China)
出处
《食品科学》
EI
CAS
CSCD
北大核心
2017年第12期304-309,共6页
Food Science
基金
湖南省食品药品监督管理局食品药品安全科技项目(湘食药科R201516)
国家自然科学基金联合基金项目(U1404215)
关键词
氰化物
食品
试纸
比色探针
检测
cyanide
food
test strip
colorimetric probe
detection
