荧光
检出限
谷胱甘肽
分析物
紫外线
信号(编程语言)
化学
光电子学
材料科学
碳纤维
光化学
有机化学
光学
色谱法
复合材料
物理
酶
复合数
程序设计语言
计算机科学
作者
Roghayeh Jalili,Alireza Khataee,Mohammad-Reza Rashidi,Rafael Luque
标识
DOI:10.1016/j.snb.2019.126775
摘要
A dual-emissive metal−organic frameworks was prepared by encapsulating yellow emitting and blue emitting carbon dots into the zeolitic imidazolate framework ([email protected]) which acted as a ratiometric probe for Glutathione. The composite shows dual-emissions which are centered at 565 and 440 nm under a single excitation wavelength of 365 nm. In the presence of Cu2+, the fluorescence of yellow emitting carbon dots in the nanocomposite was selectively enhanced, while the fluorescence of the blue emitting carbon dots was quenched. Upon addition of glutathione on Cu2+- [email protected] system, the fluorescence of both carbon dots gradually restored to their original amounts due to the strong interaction between glutathione and Cu2+. Detection progress can be observed by unaided eyes with a visual color change from yellow to blue under ultraviolet irradiation. Under the optimal conditions, glutathione determined in the range of 3–25 nM with a limit of detection of 0.90 nM (Signal/Noise = 3). The employed composite with distinct size-selectivity not only decreases the background interference from large molecule but it is also able to strongly accumulate the target analytes and thus greatly amplifies the sensing signal and specificity. Also, the ratiometric strategy provided built-in self-calibration for signal correction and improved precision and accuracy. This method was applied for the detection of glutathione in fruit samples and showed satisfactory results.
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