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Reflective optical fiber SPR sensor with DNA modification for high-sensitive Hg2+ concentration measurement.
- Source :
-
Microchemical Journal . Aug2024, Vol. 203, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- [Display omitted] • A simple and reflective optical fiber sensor was proposed for high-sensitive measurement of Hg2+ concentration. • The Hg2+ could mismatch with T-T base pairs in DNA to form T-Hg2+-T structure. • The sensor behaved good sensitivity, stability and selectivity. • The sensor behaved low detection limit. A reflective optical fiber surface plasmon resonance (SPR) sensor was proposed to measure the concentration of mercury ions (Hg2+). The specific single-stranded DNA was modified on the optical fiber sensing surface coated with Au film by the combination of covalent bond and charge adsorption. The Hg2+ can mismatch with T-T (thymine-thymine) base pairs in single-stranded DNA to form T-Hg2+-T structure, which led to the change of refractive index in sensing area and the wavelength shift of SPR spectrum. The measurement results showed that when the concentration of Hg2+ increased from 0 μM to 13 μM, the resonance spectrum shifted by 14.26 nm. In the linear range between 1–8 μM, the measurement sensitivity of the sensor could reach 1.51 nm/μM. The limit of detection (LOD) was found to be 0.28 μM. Besides, the sensor showed good stability, selectivity and reusability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0026265X
- Volume :
- 203
- Database :
- Academic Search Index
- Journal :
- Microchemical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 177908035
- Full Text :
- https://doi.org/10.1016/j.microc.2024.110861