Selective red-emission detection for mercuric ions in aqueous solution and cells using a fluorescent probe based on an unnatural peptide receptor
- Authors
- Neupane, Lok Nath; Mehta, Pramod Kumar; Kwon, Joon-Uk; Park, See-Hyoung; Lee, Keun-Hyeung
- Issue Date
- 14-Apr-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ORGANIC & BIOMOLECULAR CHEMISTRY, v.17, no.14, pp.3590 - 3598
- Journal Title
- ORGANIC & BIOMOLECULAR CHEMISTRY
- Volume
- 17
- Number
- 14
- Start Page
- 3590
- End Page
- 3598
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/1755
- DOI
- 10.1039/c8ob03224f
- ISSN
- 1477-0520
- Abstract
- The selective ratiometric red-emission detection of Hg2+ ions in aqueous buffered solutions and live cells is still a significant challenge. In the present study, we synthesized a fluorescent probe (1) based on an unnatural peptide receptor containing sulfonamide groups with an aggregation-induced emission and twisted internal charge transfer (TICT)-active fluorophore, cyanostilbene. 1 exhibited a highly selective ratiometric response to Hg2+ among 14 metal ions tested by ratiometric red-emission at 600 nm, with a clear isoemissive point in purely aqueous solution containing 1% DMSO. The ratiometric response for Hg2+ ions was complete within 3 min and the ratiometric responses induced by Hg2+ ions did not suffer considerable interference from the other metal ions. The ratiometric response was complete for less than 7 M Hg2+ and 1 had a potent binding affinity (7.42 x 10(-6) M, R-2 = 0.98) for Hg2+ and a nanomolar detection limit. 1 detected Hg2+ ions by ratiometric responses in aqueous buffered solutions over a wide range of pH (5.5-11.5). Binding mode studies using TEM, NMR, IR, and a mass spectrometer revealed that the sulfonamide groups of the unnatural peptide receptor played an important role in the complexation of Hg2+ and in the complexation-induced nano-sized aggregates, which resulted in a significant increase in emissions at 600 nm and a decrease in emissions at 535 nm. 1 quantified micro-molar concentrations (0-6 M) of Hg2+ in tap water and groundwater by ratiometric detection. Furthermore, 1 passed through the lipid membranes of live cells and detected intracellular Hg2+ ions at 2 M by a ratiometric red-emission change.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Science and Technology > Department of Biological and Chemical Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.