期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 229, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.117994
关键词
SERS; Sodium thiocyanate; Benzoic acid; Milk adulteration; Nanoparticles
类别
资金
- National Key R&D Program of China [2018YFC1603400]
- Contemporary International Collaborative Research Centre of Guangdong Province on Food Innovative Processing and Intelligent Control [2019A050519001]
- Common Technical Innovation Team of Guangdong Province on Preservation and Logistics of Agricultural Products [2019KJ145, 2019KJ101]
- Innovation Centre of Guangdong Province for Modern Agricultural Science and Technology on Intelligent Sensing and Precision Control of Agricultural Product Qualities
- Fundamental Research Funds for the Central Universities [2018MS056, 2017MS075]
- China Scholarship Council
A cysteamine functionalized core shelled nanoparticles (Au@Ag-CysNPs) was presented for simultaneous and rapid detection of sodium thiocyanate (STC) and benzoic acid (BA) preservatives in liquid milk using surface-enhanced Raman spectroscopy (SERS) technique. A spectrum covering 350-2350 cm(-1) region was selected to detect STC with concentrations ranging from 0.5 to 10 mg/L and BA with concentrations ranging from 15 to 240 mg/L in milk samples. Characterization of nanoparticles using high-resolution TEM confirmed that the successful synthesis of Au@AgNPs with core (gold) size of 28 nm and shell (silver) thickness of about 5 nm was grafted with 120 mu L of 0.1 nM cysteamine hydrochloride. Results showed that Au@Ag-CysNPs could be used to detect STC up to 0.03 mg/L with a limit of quantification (LOQ) of 0.039 mg/L and a coefficient of determination (R-2) of 0.9833 in the milk sample. For detecting BA, it could be screened up to 9.8mg/Lwith LOQ of 10.2mg/L and R-2 of 0.9903. The proposed substrate was also highly sensitive and the employed method involved only minor sample pretreatment steps. It is thus hoped that the new substrate could be used in the screening of prohibited chemicals in complex food matrices in future studies. (c) 2018 Elsevier B.V. All rights reserved.
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