Journal
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
Volume 98, Issue 10, Pages 3892-3898Publisher
WILEY
DOI: 10.1002/jsfa.8906
Keywords
surface-enhanced Raman spectroscopy; paraquat; apple juice; multivariate analysis; gold nanoparticles
Funding
- National Natural Science Foundation of China [31501558]
- Training Program for College Teachers in Shanghai [A1-2061-17-000117]
- Changsha University of Science and Technology [3120102/1197002]
- Agricultural Research Center, Washington State University
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BACKGROUNDParaquat, a highly efficient herbicide, is widely used in agricultural practices throughout the world. However, paraquat residues in food pose a threat to human health. In order to develop a rapid and sensitive method, surface-enhanced Raman spectroscopy (SERS) coupled with gold nanoparticles was applied to analysis of paraquat in apple juice. RESULTSNatural organic compounds (sugars and organic acids) in apple juice interfered with SERS measurement. Sample preparation was needed. Paraquat could be detected at concentrations as low as 0.02 and 0.1 mu g mL(- 1) with the weak cation-exchange solid-phase extraction (WCX-SPE) method and dilution method for sample preparation, respectively. For quantitative analysis, the R2 cv of the partial least-squares regression model with the dilution method (0.939) was not as good as with the WCX-SPE method (0.984), but the dilution method is much less costly, simpler and time saving. Satisfactory recovery values were obtained ranging from 94.73% to 114.81%, with the exception of 56.55% for the lowest concentration. CONCLUSIONThis work showed that SERS combined with gold nanoparticles could determine paraquat in apple juice. As a simple, rapid and ultrasensitive method, it has great practical potential for detection of other contaminants in a variety of foods. (c) 2018 Society of Chemical Industry
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