Citation: WANG Hui-Ju, YANG Ming-Hong, BIAN Xue-Li, NIU Li-Xue, LIU Hai-Lan, XIA Dan-Dan. A Flower-Like Zinc Oxide Nanoflakes Fiber for Selective Solid-Phase Microextraction of 5 Kinds of Benzotriazole Ultraviolet Filters in Food Packaging Materials[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(1): 113-120. doi: 10.19756/j.issn.0253-3820.201308 shu

A Flower-Like Zinc Oxide Nanoflakes Fiber for Selective Solid-Phase Microextraction of 5 Kinds of Benzotriazole Ultraviolet Filters in Food Packaging Materials

1.
College of Chemistry and Chemical Engineering, Qinghai Nationalities University, Xining 810007, China;
2.
Key Lab of Resource Chemistry & Eco-environmental Protection in Qinghai-Tibet Plateau, State Ethnic Affairs Committee, Qinghai Nationalities University, Xining 810007, China

Corresponding author: WANG Hui-Ju, wanghuiju2019@qhmu.edu.cn
Received Date: 26 May 2020
Revised Date: 30 October 2020

Fund Project: Supported by the National Key R & D Program of China (No.2019YFC0507405-02) and the High Level Talent Project of Qinghai Nationalities University (No.2019XGJ02).

Zinc oxide exhibits high chemical and thermal stability as well as desired adsorption, and can be used as excellent fiber coating of solid phase microextraction (SPME). In this study, the crosslinked titanium and nickel oxide composite nanoflakes (TiO₂@NiOCNFs) coating was in situ grown on nitinol (NiTi) wire by hydrothermal treatment, and then the flower-like zinc oxide nanoflakes (ZnONFs) coating was successfully modified onto the hydrothermally treated NiTi surface via potentiostatic method. Coupled to high performance liquid chromatography (HPLC), the extraction performance of the new ZnONFs-TiO₂@NiOCNFs-NiTi fiber was estimated by using typical aromatic compounds as model analytes. The fabricated fiber showed excellent extraction selectivity and high extraction capability for 5 kinds of benzotriazole ultraviolet filters (BUVFs) in food packaging materials. Under the optimized conditions such as pH=7.0, extraction temperature of 30℃, extraction time of 40 min, desorption time of 3 min, stirring rate at 500 r/min and 5% (w/V) NaCl, the proposed SPME-HPLC methods with ZnONFs-TiO₂@NiOCNFs-NiTi fiber showed a linearity from 0.05 to 200 μg/L with correlation coefficient (R) of higher than 0.9988. The limit of detection (LOD) ranged from 0.042 to 0.230 μg/kg, and the relative standard deviations (RSDs) were below 6.4% and 7.5% for intra-day and inter-day analysis of the 5 kinds of BUVFs at the spiking level of 50 μg/L using a single fiber, respectively. The developed SPME-HPLC method was successfully applied to selective extraction and determination of BUVFs in different types of food packaging materials with recovery of 83.6%-104.0% and RSDs of 5.5%-8.3%. Moreover, the novel fiber possessed good stability and repeatability, and the single fiber could finish all of analysis in the whole sequence.
- Znic oxide nanoflakes,
- NiTi fiber,
- Hydrothermal treatment,
- Solid phase microextraction,
- Potentiostatic,
- Benzotriazole,
- Ultraviolet filters
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