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Monodisperse core-shell-structured SiO2@Gd2O3:Eu3+@SiO2@MIP nanospheres for specific identification and fluorescent determination of carbaryl in green tea

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Abstract

Herein, rare-earth europium doped in Gd2O3@SiO2-based molecularly imprinted polymer (MIP) composite nanospheres with a multilayer core-shell structure was successfully prepared via a facile and versatile layer-by-layer assembly strategy of combination with sol-gel, hydrothermal, and surface imprinting procedure. The rare-earth Gd2O3:Eu3+ was embedded into the inner portion of the imprinted polymer which was well-suited for fluorescent monitoring carbaryl selectively. Results showed that the recognition process of the nanosensor for carbaryl was fast and reached dynamic equilibrium at ca. 20 min. The fluorescence intensity (F0/F) is linearly related to the concentration of carbaryl [Q] within the range of 16–80 μg mL−1, and the linear equation is F0/F = 0.8909 − 9.775 × 10−4[Q] (R = 0.9963) with 10 μg mL−1 as the detection limit. Competition experiments showed that other analogues (methomyl, aldicarb, and isoprocarb) have nearly no interference in the detection of carbaryl. Moreover, this MIP nanosensor was successfully applied to detect carbaryl in green tea samples without pretreatment. The study afforded an efficient and desirable fluorescence sensor for carbaryl detection in a complicated matrix, which hopefully will be used for biomedical/chemical sensing recognition.

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Funding

The authors gratefully acknowledge the financial support of the Xinjiang provincial young talent fund project (Grant No. 2017Q063), Xinjiang Bureau of Quality and Technical Supervision (No. 1502, No. 201602, and No. 201612), and Urumqi City major science project (Grant No. Y141320007).

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Authors and Affiliations

  1. Xinjiang Uygur Autonomous Region Product Quality Supervision and Inspection Institute, Urumqi, 830011, China

    Zerong Long, Shilin Shen & Yi Lu

  2. School of Chinese Pharmacy, Xinjiang Medical University, Urumqi, 830000, China

    Zerong Long, Shilin Shen & Wei Lan

  3. CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, 73000, China

    Jia Chen & Hongdeng Qiu

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  1. Zerong Long
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  2. Shilin Shen
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  4. Wei Lan
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Correspondence to Jia Chen or Hongdeng Qiu.

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Published in the topical collection New Insights into Analytical Science in China with guest editors Lihua Zhang, Hua Cui, and Qiankun Zhuang.

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Long, Z., Shen, S., Lu, Y. et al. Monodisperse core-shell-structured SiO2@Gd2O3:Eu3+@SiO2@MIP nanospheres for specific identification and fluorescent determination of carbaryl in green tea. Anal Bioanal Chem 411, 4221–4229 (2019). https://doi.org/10.1007/s00216-019-01902-2

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  • DOI: https://doi.org/10.1007/s00216-019-01902-2

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