Journal
TALANTA
Volume 227, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2021.122197
Keywords
Acid phosphatase; Gold nanoclusters; Fluorescence enhancement; Aggregation-induced-emission; Ascorbic acid
Categories
Funding
- National Natural Science Foundation of China [21305100]
- Project of Scientific and Technologic Infrastructure of Suzhou [SZS201708]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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A fluorescence method for measuring acid phosphatase (ACP) activity was developed in this study. It was found that in a weakly acidic environment, the generation of ascorbic acid enhanced gold nanocluster fluorescence through the reduction of Ce4+ to Ce3+, allowing for linear measurement of ACP activity. The whole analysis process was completed in 1.5 hours with results in good agreement with a reference method, demonstrating the effectiveness of the method.
A fluorescence method was developed for a turn-on measurement of acid phosphatase (ACP) activity. It was found that cerous ion (Ce3+) could lead to an enhancement of glutathione protected gold nanocluster fluorescence through an aggregation-induced-emission (AIE) process, while its higher valent counterpart ceric ion (Ce4+) could not. In a weakly acidic environment, ACP catalyzed the dephosphorylation of a phosphate ester of ascorbic acid, with a generation of ascorbic acid (AA). AA reduced Ce4+ into Ce3+, which subsequently enhanced the nanocluster fluorescence. This kind of turn-on fluorescence linearly related to the ACP activity in the range of 0.005-2.4 U/L, with a limit of detection as 0.001 U/L. Human serum samples were measured after a trichloroacetic acid treatment and a simple dilution. The whole analyses were accomplished in 1.5 h with results in good accordance with a reference method.
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