Journal
TALANTA
Volume 115, Issue -, Pages 190-194Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2013.04.030
Keywords
Water-soluble polythiophene derivatives; Fluorescence; L-cysteine; [AuCl4](-)
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Funding
- National Natural Science Foundation of China [50872042]
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A novel water-soluble cationic conjugated polymer, denoted as poly 2,5-[3-(1,1-dimethyl-4-piperidine methylene)thiophene] chloride ( PDPMT-Cl) was a novel fluorescent material. Fluorescence can be quenched by [AuCl4](-) effectively. On addition of L-cysteine (L-Cys) in [AuCl4](-)-PDPMT-Cl, fluorescence recovered. A new method to detect L-Cys was established successfully by designing a fluorescent off-on probe. The method showed good sensitivity and selectivity. Under optimized condition, the fluorescence intensity was linear to L-Cys concentration varying from 1.0 x 10(-8) M to 6.0 x 10(-5) M (gamma=0.9982). The detection limit (3 sigma) was 1.39 x 10(-10) M. The method was successfully used for the determination of L-Cys in human serum and compound amino acid injection. (c) 2013 Elsevier B.V. All rights reserved.
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