期刊
FOOD CHEMISTRY
卷 241, 期 -, 页码 427-433出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.09.019
关键词
SERS spectroscopy; Food colorants; Flower-shaped silver nanostructures; PCA
资金
- National Science Foundation for Young Scholars of China [31000316]
- Zhejiang Science and Technology Plan Project [2016C33026]
- Fundamental Research Funds for the Central University [2662017JC035]
- Zhejiang province university students in scientific and technological innovation activities [2017R409048]
Surface Enhanced Raman Scattering (SERS) spectroscopy technology is widely used in materials analysis, environmental monitoring, biomedical, food security and other fields. Flower-shaped silver nanoparticles have been successfully synthesized by a simple aqueous phase silver nitrate reduction by ascorbic acid in the presence of polyvinylpyrrolidone (PVP) surfactant. The nanoparticles diameters were adjusted from 450 to 1000 nm with surface protrusions up to 10-25 nm. The flower-shaped silver nanostructures obtained were used as stable SERS substrates with high SERS activity for detecting Rhodamine 6G (R6G), at a concentration of only 10(-9) mol/L, where the SERS signal is still clear. SERS spectroscopy of four different food colorants (e.g. food blue, tartrazine, sunset yellow, acid red) were analysed and the characteristic bands were identified. An improved principle component analysis (PCA) was used for four different food colorants detection, at concentrations down to about 10(-8) mol/L. Thus, the LOD of food blue, tartrazine, sunset yellow and acid red are 79.285 mu g/L, 5.3436 mu g/L, 45.238 mu g/L and 50.244 mu g/L, respectively.
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