Development and applications of two colorimetric and fluorescent indicators for Hg
2+ detection.
J Inorg Biochem 2017;
172:23-33. [PMID:
28419923 DOI:
10.1016/j.jinorgbio.2017.04.010]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 03/30/2017] [Accepted: 04/08/2017] [Indexed: 11/23/2022]
Abstract
Two rhodamine-active probes RBAI (Rhodamine B-di-Aminobenzene-phenyl Isothiocyanate) and RGAI (Rhodamine 6G-di-Aminobenzene-phenyl Isothiocyanate) were designed, synthesized and characterized. The probes were developed as fluorescent and colorimetric chemodosimeters in ethanol-water solution with a broad pH span (5-10) and high selectivity toward Hg2+ but no significant response toward other common competitive cations. The Hg2+-promoted ring opening of spirolactam of the rhodamine moiety induced cyclic guanylation of the thiourea moiety, which resulted in the dual chromo- and fluorogenic observation (off-on). Cytotoxicity and bioimaging studies by L929 living cells and living mice indicated that the probes were negligible cytotoxicity, cell permeable and suitable for detecting Hg2+ in biological environments. Moreover, the new probes not only displayed excellent abilities for the successful detection of Hg2+ in L929 living cells and living mice but also able to detect Hg2+ by adsorbing on solid surfaces and quantitative detection of Hg2+ in real water samples with good recovery (more than 90%), indicating that they have promising prospect for application for Hg2+ sensing in environmental and biological sciences.
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