机构地区: 陕西师范大学化学化工学院
出 处: 《分析测试学报》 2008年第10期1071-1074,共4页
摘 要: 以苏丹红Ⅰ作模板分子,用悬浮聚合法制备出微米级苏丹红Ⅰ分子印迹聚合物并将其做成微固相萃取柱,直接安装在流动注射系统的八通阀上,对样品溶液中的苏丹红Ⅰ进行在线分离和富集;经甲醇和甲酸混合洗脱液(体积比2:1)在线洗脱后与酸性高锰酸钾发生化学发光反应。据此建立了在线分子印迹微固相萃取,高锰酸钾氧化苏丹红化学发光测定食品中苏丹红Ⅰ的新方法。结果表明,测定的苏丹红Ⅰ线性范围为1.0×10^-6~7.0×10^-4g/L,方法检出限(3仃)为3×10^-7g/L,11次平行测定1×10^-5g/L苏丹红Ⅰ溶液的化学发光强度相对标准偏差为2.0%。 Molecularly imprinted polymer (MIP) microspheres with a diameter range of 1-10 μm were synthesized by suspension polymerization using Sudan Ⅰ as the template molecule. An on-line preconcentration and extraction flow-injection system using solid phase extraction (SPE) column packed with prepared MIP microspheres was set up. The column was mounted on the 8-way valve of the flow injection system, and eluted with a mixture of methanol and formic acid (2 : 1, by volume) after preconcentration. Sudan Ⅰ in the eluent was oxidized by acidic potassium permanganate in the flow cell forming a chemiluminescent product. Under optimal conditions, the chemiluminescence intensity has a linear relationship with the concentration of Sudan Ⅰ in the range of 1.0×10^-6~7.0×10^-4 g/L with a detection limit (3σ) of 3×10^-7 g/L. The relative standard deviation was 2.0% for 1×10^-5g/L of Sudan Ⅰ (n=ll).