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基于银薄膜/荷叶SERS效应直接检测婴儿配方奶粉中三聚氰胺
胡樱子, 阴正源, 肖桂娜
上海师范大学 数理学院
摘要:
以天然荷叶为衬底,结合真空磁控溅射法沉积银薄膜,制备出了一种高效的表面增强拉曼散射(SERS)活性基底。研究发现银/荷叶基底对婴儿配方奶粉中掺杂的三聚氰胺分子表现出良好的识别能力,而不需作额外的样品预处理。对掺杂不同浓度三聚氰胺的奶粉溶液进行定量分析,在5-50 mg/L浓度范围内获得了较好的线性关系(其线性相关系数R2 > 0.99)。根据3σ准则,检测极限估计为1 mg/L。此外,银/荷叶基底具有良好的均匀性和重复性(相对标准偏差为7.64%和10.54%)。该方法对婴儿奶粉中三聚氰胺的检测具有简单、快速、无损、便宜等优点。
关键词:  真空磁控溅射  荷叶  银薄膜  表面增强拉曼散射  三聚氰胺  婴儿配方奶粉
DOI:
分类号:O647
基金项目:国家自然科学基金(61405116);上海高校青年教师培养资助计划项目。感谢上海交通大学人工结构及量子调控教育部重点实验室资助。
Direct detection of melamine in infant formula milk powder based on SERS effect of silver thin film coated lotus-leaf
HU Yingzi, YIN Zhengyuan, XIAO Guina
College of Mathematics and Sciences,Shanghai Normal University
Abstract:
An efficient surface-enhanced Raman scattering (SERS) substrate has been developed by depositing silver thin film on natural lotus?leaf (Ag/lotus-leaf) with vacuum magnetron sputtering method. It was found that the Ag/lotus-leaf substrate showed excellent ability to recognize melamine molecules in infant formula milk powder directly without any sample pretreatment. Quantitative analyses of melamine in milk powder solution at different concentrations were carried out. A good linear relationship was obtained at concentrations ranging from 5 mg/L to 50 mg/L, and the correlation coefficient (R2) of the curve was larger than 0.99. According to the rule of 3σ, the limit of detection is estimated to be 1 mg/L. Furthermore, the Ag/lotus-leaf substrate exhibited good uniformity and reproducibility with relative standard deviation (RSD) values of 7.64% and 10.54%. This method was simple, fast, nondestructive, and inexpensive for the detection of melamine in infant formula milk.
Key words:  vacuum magnetron sputtering  lotusSleaf  silver thin film  surface-enhanced Raman scattering  melamine  infant formula milk powder