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Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
Published on: June 23, 2016
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A simple benzimidazole styryl-based colorimetric chemosensor for dual sensing application.
Daulat Phapale1, Archana Kushwaha1, Dipanwita Das1
1Department of Chemistry, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 17, 2019
Summary
A novel styryl-benzimidazole receptor (L1) was developed for selective ion detection. It effectively senses bisulfate (HSO₄⁻), copper (Cu²⁺), and aluminum (Al³⁺) ions, with practical applications demonstrated using paper strips.
Area of Science:
- Chemical Sensing
- Materials Science
- Analytical Chemistry
Background:
- Development of selective chemosensors is crucial for environmental and industrial monitoring.
- Styryl-benzimidazole derivatives offer promising scaffolds for molecular recognition.
Purpose of the Study:
- To synthesize and characterize a new colorimetric receptor, trans-2-[4'-(dimethylamino)styryl]benzimidazole (L1).
- To investigate the sensing capabilities of L1 towards various anions and cations.
- To explore the practical application of L1 in ion detection.
Main Methods:
- Synthesis and full characterization of L1 using NMR, elemental analysis, UV-vis, and HRMS.
- UV-vis spectroscopy for investigating sensing abilities with multiple anions and cations.
- ¹H NMR titration for confirming receptor-analyte interactions.
- Job's method and HRMS for determining binding stoichiometry and complex formation.
Main Results:
- Receptor L1 exhibited a selective colorimetric response exclusively for bisulfate (HSO₄⁻) ions.
- L1 demonstrated selective sensing of Cu²⁺ (yellow to green) and Al³⁺ (yellow to dark yellow) ions.
- A 1:1 binding stoichiometry was determined for L1 with HSO₄⁻, Cu²⁺, and Al³⁺.
- Paper strips incorporating L1 successfully detected HSO₄⁻ and Cu²⁺ ions down to 10 ppm.
Conclusions:
- The synthesized styryl-benzimidazole receptor (L1) is a highly selective and sensitive sensor for HSO₄⁻, Cu²⁺, and Al³⁺ ions.
- The receptor's ability to induce distinct color changes facilitates visual detection.
- The developed paper strip sensor offers a practical and cost-effective tool for on-site ion detection.
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