Details

Autor(en) / Beteiligte

• Cao, Yichuan
• Hu, Xuelian
• Zhao, Tian
• Mao, Yuehui
• Fang, Guozhen
• Wang, Shuo

Titel

A core-shell molecularly imprinted optical sensor based on the upconversion nanoparticles decorated with Zinc-based metal-organic framework for selective and rapid detection of octopamine

Ist Teil von

• Sensors and actuators. B, Chemical, 2021-01, Vol.326, p.128838, Article 128838

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Quelle

ScienceDirect

Beschreibungen/Notizen

• A. The structure of UCNPs@ZIF-8@MIP (the green part is upconverting nanoparticles, the yellow interlayer represents the metal organic framework ZIF-8 layer, and the blue shell is the molecularly imprinted polymer with specific imprinting holes toward octopamine); B. preparation process of UCNPs@ZIF-8@MIP; C. the process of detecting octopamine in actual sample. [Display omitted] •A fluorescent sensor UCNPs@ZIF-8@MIP has been designed for the quantification of octopamine.•The introduction of ZIF-8 simultaneously improved the optical properties and adsorption performance of UCNPs@ZIF-8@MIP.•The UCNPs@ZIF-8@MIP with high specificity and sensitivity exhibited excellent linear response toward octopamine.•The fluorescence sensor UCNPs@ZIF-8@MIP can detect octopamine in real sample without complicated preprocessing. A sensitive fluorescent sensor for the detection of octopamine (OA) has been established by encapsulating the upconversion nanoparticles (UCNPs) into the metal-organic frameworks (ZIF-8) and incorporating molecularly imprinted polymer (MIP). The presence of ZIF-8 with high specific surface area and strong stability can improve the dispersity and emission intensity of UCNPs in the organic phase. Meanwhile, ZIF-8 membrane reduced the mass transfer resistance and adsorption time of molecularly imprinted polymers. Thus, the final UCNPs@ZIF-8@MIP sensor has exhibited the excellent optical property and the superior selective recognition ability, which was similar to natural receptors. Under the optimum condition, the fluorescence intensity of UCNPs@ZIF-8@MIP increased linearly with the concentration of OA in the range of 0.1−10 mg L−1. Compared with traditional detection methods, the current method with the detection limit of 0.081 mg L−1 would yield double functions of specific recognition and quantitative detection for OA without sophisticated preprocessing. At the spiked concentration levels of 2, 4, 6, 8 mg L−1, the recovery range of OA in beer was 81.75%–90.63% with relative standard deviation (RSD) of 2.56–5.13%.