Key Laboratory of Geriatric Nutrition and Health (Beijing Technology and Business University), Ministry of Education, 11 Fucheng Road, Beijing, 100048, China.
Mikrochim Acta. 2024 Aug 6;191(9):512. doi: 10.1007/s00604-024-06590-z.
Diphenylalanine(FF)-Zn self-assembly (FS) confined in covalent organic polymers (FS@COPs) with efficient fluorescence was synthesized for fluorescence sensing of biogenic amines, which was one of the most important indicators for monitoring food freshness. FS@COPs combined excellent biodegradability of self-assembled dipeptide with chemical stability, porosity and targeted site recognition of COPs. With an optimal excitation wavelength of 360 nm and an optimal emission wavelength of 450 nm, FS@COPs could be used as fluorescence probes to rapidly visualize and highly sensitive determination of tryptamine (Try) within 15 min, and the linear range was from 40 to 900 μg L with a detection limit of 63.08 μg kg. Importantly, the FS@COPs showed a high fluorescence quantum yield of 11.28%, and good stability, solubility, and selectivity, which could successfully achieve the rapid, accurate and highly sensitive identification of Try. Furthermore, we revealed the mechanism of FS@COPs for fluorescence sensing of targets. The FS@COPs system was applied to the fluorescence sensing of Try in real samples and showed satisfactory accuracy of 93.02%-105.25%.
二苯丙氨酸（FF）-Zn 自组装（FS）被限制在具有高效荧光的共价有机聚合物（FS@COPs）中，用于生物胺的荧光传感，这是监测食品新鲜度的最重要指标之一。FS@COPs 结合了自组装二肽的优异生物降解性与 COPs 的化学稳定性、多孔性和靶向位点识别。在最佳激发波长为 360nm 和最佳发射波长为 450nm 的条件下，FS@COPs 可用作荧光探针，可在 15 分钟内快速可视化和高灵敏度测定色胺（Try），线性范围为 40 至 900μg L，检测限为 63.08μg kg。重要的是，FS@COPs 表现出 11.28%的高荧光量子产率，以及良好的稳定性、溶解度和选择性，可成功实现 Try 的快速、准确和高灵敏度识别。此外，我们揭示了 FS@COPs 用于目标荧光传感的机制。FS@COPs 系统被应用于实际样品中 Try 的荧光传感，具有 93.02%-105.25%的令人满意的准确性。
