期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 10, 页码 11646-11656出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00134
关键词
metal-organic framework; alkaline phosphatase; rational design; visual; ratiometric fluorescence; aggregation-induced emission
资金
- National Natural Science Foundation of China [82073811, 81673394]
- Fundamental Research Funds for the Central Universities [2042020kf1010]
This study presents a reasonable design strategy for dual-emission Ln-MOFs based on theoretical calculations, combining various theories to reveal the luminescence law of Ln-MOFs. The developed dual-emission Tb-MOF fluorescent probe shows ultrasensitive and selective response to ALP, suitable for point-of-care visual detection. The research also includes the development of a portable enzyme activity assay kit and a logical decoder for intelligent ALP activity detection equipment.
The alkaline phosphatase (ALP) activity assay is very significant for disease diagnosis and biomedical research. Lanthanide metal-organic framework (Ln-MOF) based fluorescence sensors have great application potential in ALP activity assays. However, it is critical but challenging to investigate the emission law of Ln-MOFs for revealing rational design principles and selecting an appropriate MOF. Here, we describe a reasonable design strategy for dual-emission Ln-MOFs based on theoretical calculations. This strategy combines Reinhoudt empirical rule, intramolecular charge transfer theory, and aggregation/coordination-induced emission theory; reveals the luminescence law of Ln-MOFs; and provides theoretical guidance for the rational design of dual-emission Ln-MOFs. On the basis of this strategy, we create a dual-emission Tb-MOF fluorescent probe used for ALP activity assay and investigate the detection mechanism. The probe shows ultrasensitive (limit of detection 0.002 mU mL(-1)) and selective response to ALP, and it suits for point-of-care visual detection coupled with a self-designed portable enzyme activity assay kit and smartphone-assisted visual device. The kit-based visual assay method can accurately quantify the activity of ALP in real serum samples (recovery >93%, and relative error is less than 6.8% compared with the results of fluorescence spectrometer-based method) and consumes only 25 mu L of serum. In addition, a logical decoder based on the dual-key unlocking strategy is designed, providing a feasible solution for the development of intelligent ALP activity detection equipment. As far as we know, this is the first report of a theoretical calculation-guided versatile design strategy for dual-emission Ln-MOFs and a portable enzyme activity assay kit for visual detection.
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