Colorimetric Detection of Melamine Based on Poly-thymine Stabilized Gold Nanoparticles
(0) A simple,fast and reliable colorimetric method for melamine detection based on gold nanoparticles (AuNPs) and poly-thymine (poly-T) is reported.Poly-T strands attract AuNPs through static electricity and keep them stable against aggregation in the presence of NaCl.The affinity between melamine and poly-T,hydrogen bond,frees AuNP from the protection provided by poly-T and thus makes AuNPs aggregate in the presence of NaCl.The color change of AuNPs from wine red to blue can be observed immediately by the naked eye during the aggregation process,and can be accurately recorded with the help of a UV/vis spetrophotometer within 5 minutes.The limit of detection (LOD) of melamine in pure water is 0.146 μmol/L with a linear range from 0.2×10-7 mol/L to 10.0×l0-7 mol/L.In fresh milk and milk powder,the LOD is respectively as low as 2.37 μmol/L and 5.36 μmol/L.
Melamine Poly-thymine Gold nanoparticles Colorimetry
JIN Chong ZHAO Huimin LIU Meng TIAN Junping QUAN Xie
School of Environmental Science and Technology,Dalian University of Technology,China
国际会议
西安
英文
13-16
2013-07-27（万方平台首次上网日期，不代表论文的发表时间）