期刊
FOOD CHEMISTRY
卷 197, 期 -, 页码 723-729出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.11.014
关键词
Penicilloic acid; Milk products; Surface-enhanced Raman scattering; Core-shell nanoparticles
资金
- National Natural Science Foundation of China [21275075, 21075066]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20113234110001]
A label-free surface-enhanced Raman scattering (SERS) strategy based on silver-coated gold nanoparticles (Au@Ag NPs) was developed for rapid detection of penicilloic acid (PA) in milk products. It has been demonstrated that core size and shell thickness of Au@Ag NPs are two critical variants affecting enhancement of Raman signals by coupling of two plasma resonance absorption. The Au@Ag NPs with 26-nm core and 9-nm Ag shell exhibit excellent Raman enhancement, in particular, upon the formation of hot spots through NPs aggregation induced by interaction between target molecules and Au@Ag NPs. Compared to the early studies limited to laboratory settings, our analytical approach is simple (without sample pretreatment), less time-consuming (within similar to 3 min) and inexpensive. The limit of detection of PA is 3.00 ppm, 3.00 ppm and 4.00 ppm in liquid milk, yogurt and milk powder, respectively. The label-free SERS technique offers a potential for the on-site monitoring of chemical contaminants in milk products. (C) 2015 Elsevier Ltd. All rights reserved.
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