纳米传感器
分子印迹聚合物
荧光
检出限
沸石咪唑盐骨架
量子产额
量子点
石墨烯
发光
材料科学
咪唑酯
选择性
化学
纳米技术
金属有机骨架
色谱法
吸附
无机化学
有机化学
光电子学
物理
量子力学
催化作用
作者
Ying Guo,Guanqing Yuan,Xuelian Hu,Jinni Zhang,Guozhen Fang
出处
期刊:Foods
[MDPI AG]
日期:2022-05-06
卷期号:11 (9): 1348-1348
被引量:2
标识
DOI:10.3390/foods11091348
摘要
In this study, a novel fluorescent molecularly imprinted nanosensor (N, S-GQDs@ZIF-8@MIP) based on the nitrogen and sulfur co-doped graphene quantum dots decorated zeolitic imidazolate framework-8 was constructed for the detection of octopamine (OA). Herein, ZIF-8 with a large surface area was introduced as a supporter of the sensing system, which effectively shortened the response time of the sensor. Meanwhile, high green luminescent N, S-GQDs and a maximum emission wavelength of 520 nm under 460 nm excitation and a 12.5% quantum yield were modified on the surface of ZIF-8 as a signal tag that can convert the interactions between the sensor and OA into detectable fluorescent signals. Finally, N, S-GQDs@ZIF-8@MIP was acquired through the surface molecular imprinting method. Due to the synergy of N, S-GQDs, ZIF-8, and MIP, the obtained sensor not only demonstrated higher selectivity and sensitivity than N, S-GQDs@ZIF-8@NIP, but also displayed faster fluorescence response than N, S-GQDs@MIP. Under optimal conditions, the developed sensor presented a favorable linear relationship in the range of 0.1-10 mg L-1 with a detection limit of 0.062 mg L-1. Additionally, the proposed N, S-GQDs@ZIF-8@MIP strategy was effectively applied to the detection of OA in fermented samples, and the obtained results had a satisfactory correlation with those of HPLC.
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