Abstract
A dansyl derivative-based fluorescent probe, namely, DGly, was developed for relay detection of Cu2+ and bovine serum albumin (BSA) with high selectivity and sensitivity. The fluorescence intensity of DGly at 540 nm displayed “on–off–on” phenomenonafter Cu2+ and BSA were added in sequence. Correspondingly, the solution color changed from yellow to dark and then to yellowish white under 365 nm UV light irradiation; thus, the solution could be detected by the naked eye. The association constant of DGly–Cu2+ was stronger than that of DGly–BSA and DGly–Cu2+–BSA. Hence, BSA was detected after a complex was formed between DGly and Cu2+. The relay detection of Cu2+ and BSA was not influenced by other competitive interferents, and the detection limits of Cu2+ and BSA were 1.32 and 0.26 μM, respectively. Analysis of Cu2+ in real water samples validated the detection performance of the method proposed herein; it achieved satisfactory recovery and relative standard deviation values. This work demonstrated that introducing metal ions can be an effective way to improve the sensitivity of BSA detection.
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