A logic gate-based fluorogenic probe for Hg2+ detection and its applications in cellular imaging
2016 (English)In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 919, 85-93 p.Article in journal (Refereed) PublishedText
A new colorimetric and fluorogenic probe (RN3) based on rhodamine-B has been successfully designed and synthesized. It displays a selective response to Hg2+ in the aqueous buffer solution over the other competing metals. Upon addition of Hg2+, the solution of RN3 exhibits a naked eye observable color change from colorless to red and an intensive fluorescence with about 105-fold enhancement. The changes in the color and fluorescence are ascribed to the ring-opening of spirolactam in rhodamine fluorophore, which is induced by a binding of the constructed receptor to Hg2+ with the association and dissociation constants of 0.22 x 10(5) M-1 and 25.2 mM, respectively. The Jobs plot experiment determines a 1: 1 binding stoichiometry between RN3 and Hg2+. The resultant "turn-on" fluorescence in buffer solution, allows the application of a method to determine Hg2+ levels in the range of 4.0-15.0 mu M, with the limit of detection (LOD) calculated at 60.7 nM (3 sigma/slope). In addition, the fluorescence turn-off and color fading-out happen to the mixture of RN3-Hg2+ by further addition of I- or S2-. The reversible switching cycles of fluorescence intensity upon alternate additions of Hg2+ and S2- demonstrate that RN3 can perform as an INHIBIT logic gate. Furthermore, the potential of RN3 as a fluorescent probe has been demonstrated for cellular imaging. (C) 2016 Elsevier B.V. All rights reserved.
Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2016. Vol. 919, 85-93 p.
Mercury; Rhodamine; Fluorogenic probe; Fluorescent imaging; Logical gate
IdentifiersURN: urn:nbn:se:liu:diva-128135DOI: 10.1016/j.aca.2016.03.017ISI: 000374642400011PubMedID: 27086103OAI: oai:DiVA.org:liu-128135DiVA: diva2:929592
Funding Agencies|National Natural Science Foundation of China ; Knut and Alice Wallenberg Foundation (KAW) [2012.0083]; Swedish Government Strategic Faculty Grant in Material Science 11 (SFO, MATLIU) in Advanced Functional Materials (AFM) (VR) [5.1-2015-5959]; Centre in Nano Science and Nanotechnology (CeNano) Grant in LiTH2016-05-192016-05-192016-06-03