Journal
ACS OMEGA
Volume 4, Issue 5, Pages 9333-9342Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b00874
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Funding
- National Natural Science Foundation of China [21864006, 21763005, 21563006]
- Natural Science Foundation of Guangxi Province [2017GXNSFDA198034, 2017GXNSFFA198005, 2016GXNSFBA380118]
- Guangxi Scientific and Technological Development Projects [AD17195081]
- China Scholarship Council Project [201708455047]
- High-Level-Innovation Team [guijiaoren[2017]38]
- Outstanding Scholar Project of Guangxi Higher Education Institutes
- BAGUI Scholar Program of Guangxi Province of China
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Detection of cholesterol and uric acid biomarkers is of great importance for clinical diagnosis of several serious diseases correlated with their variations in human blood serum. In this study, a new kind of well selective and highly sensitive ratiometric fluorescent probe for cholesterol and uric acid determination in human blood serum was innovatively developed on the basis of the inner filter effect (IFE) process of nitrogen, cobalt co-doped carbon dots (N, Co-CDs) with 2,3-diaminophenazine (DAP). DAP was the oxidative product during the oxidation reaction between o-phenylenediamine and H2O2. Fluorescent magnetic N, Co-CDs possessing blue emission and magnetic property were prepared through a facile one-pot hydrothermal strategy by using citric acid, diethylenetriamine, and cobalt(II) chloride hexahydrate as precursors. N, Co-CDs exhibited good ferromagnetic property and excellent optical properties even in extremely harsh environmental conditions, implying the huge potential applications of such N, Co-CDs in biological areas. On the basis of the IFE process between N, Co-CDs and DAP, N, Co-CDs were applied to establish ratiometric fluorescent probes for the indirect detection of cholesterol and uric acid that participated in enzyme-catalyzed H2O2-generation reactions. The established IFE-based fluorescent probes exhibited relatively low detection limits of 3.6 nM for cholesterol and 3.4 nM for uric acid, respectively. The fluorescent probe was successfully utilized for the determination of cholesterol and uric acid in human blood serum with satisfying results, which provided an informed perspective on the applications of such doped CDs to explore the specific and sensitive nanoprobe in disease diagnoses and clinical therapy.
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