三聚氰胺
化学
拉曼散射
拉曼光谱
检出限
纳米颗粒
试剂
材料科学
基质(水族馆)
离心
色谱法
分析化学(期刊)
化学工程
纳米技术
有机化学
物理
地质学
工程类
光学
海洋学
作者
Ruoping Li,Guanghong Yang,Jingliang Yang,Jianhua Han,Junhui Liu,Mei Huang
出处
期刊:Food Control
[Elsevier]
日期:2016-10-01
卷期号:68: 14-19
被引量:50
标识
DOI:10.1016/j.foodcont.2016.03.009
摘要
A simple and rapid method to detect melamine in liquid milk by Surface-enhanced Raman Scattering (SERS) technique was presented. The pretreatment procedure of milk samples only contains hydrochloric acid treatment and twice centrifugation. In order to reduce the distortion about the Raman signals originating from charge transfer and electronic tunnelling effect, SiO2 shell-isolated gold nanoparticles ([email protected]2 NPs) instead of Au NPs were employed to enhance signal intensity. Aggregation occurs when the [email protected]2 NPs colloid is mixed with the melamine solution or the treated milk containing melamine. Different from aggregated Au NPs, these aggregated [email protected]2 NPs on Cu substrate can undistortedly enhance the Raman signals of melamine using surface plasma effect. Quantitative analysis was tried and the results showed a good linearity (R2 ≈ 0.99) when the melamine concentration was between 0.5 mgL−1 and 5 mgL−1. The detection sensitivity satisfies the requirement of the Codex Alimentarius Commission and this method can be practically used for melamine detection in milk.
科研通智能强力驱动
Strongly Powered by AbleSci AI