Zhejiang Provincial Key Laboratory of Watershed Science and Health, College of Public Health and Management, Center for Health Assessment, Wenzhou Medical University, Wenzhou 325035, China.
Zhejiang Provincial Key Laboratory of Watershed Science and Health, College of Public Health and Management, Center for Health Assessment, Wenzhou Medical University, Wenzhou 325035, China; School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Food Chem. 2021 Nov 1;361:130105. doi: 10.1016/j.foodchem.2021.130105. Epub 2021 May 14.
Inevitably, the residues of polycyclic aromatic hydrocarbons (PAHs) in tea leaves will be transferred to hot tea infusion, constituting a certain drinking risk; consequently, it is imperative to develop rapid, sensitive, and robust approaches for their trace-level detection. Herein, we developed a syringe membrane-based microextraction (SMME) method for preconcentration/extraction of PAHs in tea infusions. This method utilized metal-organic framework-mixed matrix membranes (MOF-MMMs) as adsorbents, which anchored the nanoparticles of MOFs onto the surface of PVDF membrane. The UiO-66 (Zr)-based MMM possessed high Brunauer-Emmett-Teller (BET) surface area (320.5 m g) and pore volume (0.18 cm g), thus enhancing extraction/adsorption efficiency. Under optimized conditions, the limits of detection for PAHs reached as low as 0.02-0.08 μg L with extraction recoveries of 85.5-102.1%, and the inter-day and intra-day precision was lower than 8.4% in tea infusions. Consequently, the SMME/HPLC-DAD method shows a great potential in conventional monitoring of PAHs in tea samples.
茶叶中多环芳烃（PAHs）的残留不可避免地会转移到热茶浸出液中，构成一定的饮用风险；因此，开发快速、灵敏、稳健的痕量检测方法势在必行。本文建立了一种基于注射器膜的微萃取（SMME）方法，用于茶叶浸提液中 PAHs 的预浓缩/萃取。该方法以金属有机骨架混合基质膜（MOF-MMMs）作为吸附剂，将 MOFs 的纳米颗粒锚定在 PVDF 膜的表面。基于 UiO-66（Zr）的 MOF-MMM 具有高的 Brunauer-Emmett-Teller（BET）比表面积（320.5 m g）和孔体积（0.18 cm g），从而提高了萃取/吸附效率。在优化条件下，PAHs 的检出限低至 0.02-0.08 μg L，萃取回收率为 85.5-102.1%，茶浸提液的日内和日间精密度低于 8.4%。因此，SMME/HPLC-DAD 方法在常规监测茶叶中的 PAHs 方面具有很大的潜力。
