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Quantification of Cadmium in Rice by Surface-enhanced Raman Spectroscopy Based on a Ratiometric Indicator and Conical Holed Enhancing Substrates

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Abstract

A surface-enhanced Raman spectroscopy (SERS) based method was developed for the quantification of Cd2+ in rice. Gold nano-particles (AuNPs) modified with trimercaptotriazine served as a ratiometric SERS probe for the detection of Cd2+. A conical holed substrate was used to further enhance SERS signals, and hence to improve the sensitivity. A calibration model based on the spectral shape deformation quantitative theory was employed to mitigate the influence of variations in the number and distribution of “hot spots”. The proposed SERS method was applied to quantitative analysis of Cd2+ in three types of rice, and achieved satisfactory quantitative results with accuracy comparable to that of the reference method—inductively coupled plasma mass spectrometry. The limit of detection of the proposed method was estimated to be 8 μg kg−1. The proposed SERS method has the potential to become a fast screening method for the detection of Cd2+ in rice.

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Acknowledgments

The authors acknowledge the financial support of the National Natural Science Foundation of China (no. 21475039, no. 21775038, no. 21705044), and the Natural Science Foundation of Hunan Province (no. 2015JJ2028).

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Authors and Affiliations

  1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, PR China

    Qi Zuo, Zeng-Ping Chen & Ru-Qin Yu

  2. Hunan Key Lab of Biomedical Materials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412008, PR China

    Yao Chen

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  1. Qi Zuo
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  2. Yao Chen
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  3. Zeng-Ping Chen
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  4. Ru-Qin Yu
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Correspondence to Yao Chen or Zeng-Ping Chen.

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Zuo, Q., Chen, Y., Chen, ZP. et al. Quantification of Cadmium in Rice by Surface-enhanced Raman Spectroscopy Based on a Ratiometric Indicator and Conical Holed Enhancing Substrates. ANAL. SCI. 34, 1405–1410 (2018). https://doi.org/10.2116/analsci.18P342

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  • DOI: https://doi.org/10.2116/analsci.18P342

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