Abstract
We have synthesized silver nanoparticles (AgNPs) decorated with α-cyclodextrin (CD) by using the traditional silver mirror reaction in the presence of CD. The CD-AgNPs were used as substrate in surface-enhanced Raman spectroscopy (SERS) for determining melamine. The intensity of the Raman band of melamine at 704 cm−1 was used to determine melamine in milk and milk powder. The use of CD-AgNPs as the SERS substrate rather than classical silver nanoparticles makes the method more sensitive in giving an enhancement by a factor of up to ~ 106 in scattering efficiency. The effects of the volume of solutions (of CD-AgNPs, NaCl, NaOH, melamine) and of mixing time were optimized. The standard addition method was employed for quantitative analysis. The correlation coefficient of the calibration plot is 0.9995, and the limit of detection is 3.0 μg L−1. The method was successfully applied to the determination of melamine in milk and milk powder, with relative standard deviations of <10 % and recoveries between 89 and 104 %.
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Acknowledgments
This work was supported by National “Twelfth Five-Year” Plan for Science and Technology Support (No. 2012BAF14B08), Program for New Century Excellent Talents in University (No. NECT-10-0443), National Natural Science Foundation of China (No. 21105037) and Science and Technology Developing Foundation of Jilin Province (No. 20121808).
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Ma, P., Liang, F., Sun, Y. et al. Rapid determination of melamine in milk and milk powder by surface-enhanced Raman spectroscopy and using cyclodextrin-decorated silver nanoparticles. Microchim Acta 180, 1173–1180 (2013). https://doi.org/10.1007/s00604-013-1059-7
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DOI: https://doi.org/10.1007/s00604-013-1059-7