期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 353, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.131146
关键词
Sulfur quantum dots; Heparin; Ratiometric fluorescence; Inner filter effect; Uric acid
资金
- National Natural Science Foundation of China [81973283, 61775099, 21705080, 61905280]
- Natural Science Foundation of Jiangsu Province [BK20171487, BK20171043]
A novel kind of sulfur quantum dots (Hep-SQDs) is synthesized using heparin as passivator and stabilizer for the first time. The Hep-SQDs show excitation-independent emission and have a high quantum yield. They are successfully applied for the detection of uric acid.
In this work, a novel kind of sulfur quantum dots (SQDs) is synthesized using heparin as passivator and stabilizer for the first time by simple treatment of sublimed sulfur and NaOH under a pure oxygen atmosphere. The obtained heparin SQDs (Hep-SQDs) show excitation-independent emission and have a high quantum yield (11.4%). Herein, we set up a ratiometric fluorescence probe based on the inner filter effect between Hep-SQDs and 2, 3diaminophenazine, the oxidative product of o-phenylenediamine to detect uric acid (UA). The proposed probe is demonstrated to be highly selective and sensitive for UA assay with detection limit of 0.56 mu M. Moreover, the established fluorescence probe is also successfully applied to the determination of UA in human serum. We hope this work can provide new opportunities for developing good performance fluorescent biosensors based on SQDs.
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