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Dhanya TM, Krishnan A, Anjali Krishna G, Francis S, Aswathy PV, Augustine M, Shanty AA, Divya KM, Savitha DP, Mohanan PV. A novel benzothiophene incorporated Schiff base acting as a "turn-on" sensor for the selective detection of Serine in organic medium. Bioorg Chem 2023; 136:106525. [PMID: 37054527 DOI: 10.1016/j.bioorg.2023.106525] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/24/2023] [Accepted: 04/02/2023] [Indexed: 04/08/2023]
Abstract
A novel fluorogenic sensor N-benzo[b]thiophen-2-yl-methylene-4,5-dimethyl-benzene-1,2-diamine (BTMPD) was synthesized and characterized by using spectroscopic methods including UV-visible, FT-IR, 1H NMR, 13C NMR, and mass spectrometry. The designed fluorescent probe, owing to its remarkable properties, behaves as an efficient turn-on sensor for the sensing of amino acid Serine (Ser). Also, the strength of the probe enhances upon the addition of Ser via charge transfer, and the renowned properties of the fluorophore were duly found. The sensor BTMPD shows incredible execution potential with respect to key performance indicators such as high selectivity, sensitivity, and low detection limit. The concentration change was linear ranging from 5 × 10-8 M to 3 × 10-7 M, which is an indication of the low detection limit of 1.74 ± 0.02 nM under optimal reaction conditions. Interestingly, the Ser addition leads to an increased intensity of the probe at λ = 393 nm which other co-existing species did not. The information about the arrangement and the features of the system and the HOMO-LUMO energy levels was found out theoretically using DFT calculations which is fairly in good agreement with the experimental cyclic voltammetry results. The fluorescence sensing using the synthesized compound BTMPD reveals the practical applicability and its application in real sample analysis.
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Affiliation(s)
- T M Dhanya
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India
| | - Aravind Krishnan
- Department of Chemistry, Saint Berchmans College, Changanassery, Kerala, India
| | - G Anjali Krishna
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India
| | - Shijo Francis
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India
| | - P V Aswathy
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India
| | - Maria Augustine
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India; Department of Chemistry, St. Paul's College, Kalamasserry, Kerala, India
| | - A A Shanty
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India; Department of Chemistry, St Teresa's College, Kochi, Kerala, India
| | - K M Divya
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India; Department of Chemistry, NSS College, Cherthala, Kerala, India
| | - D P Savitha
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India
| | - P V Mohanan
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 22, Kerala, India.
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Mishra S, Kumar Singh A. Real time sensor for Fe 3+, Al 3+, Cu 2+ & PPi through quadruple mechanistic pathways using a novel dipodal quinoline-based molecular probe. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 270:120832. [PMID: 35065423 DOI: 10.1016/j.saa.2021.120832] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 11/23/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
A quinoline-based small molecular probe, H2L was designed, synthesized and characterized by different spectroscopic methods. It was utilized as a multi-responsive probe for the detection of Fe3+, Al3+, Cu2+ and PPi. It showed very selective instant turn-on fluorimetric response towards Fe3+and Al3+ with a detection limit in nanomolar range. Solutions of H2L containing Fe3+ or Al3+ could sequentially sense PPi by a turn-off mechanism. Also, H2L could determine the presence of Cu2+ very selectively among a series of other metal ions by a sharp change in colour. Detection of Cu2+ through colorimetry was further investigated by systematic UV-Vis studies and the potential of H2L to act as a potential colorimetric sensor for Cu2+ was suitably established. Filter-paper strip experiments were conducted to demonstrate the practical utility of the proposed sensor. Potential applications of H2L as a sensor for pH in the acidic range has also been explored.
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Affiliation(s)
- Sagarika Mishra
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 752050, India
| | - Akhilesh Kumar Singh
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 752050, India.
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