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Spinel Cobalt Ferrite Nanoparticles for Sensing Phosphate Ions in Aqueous Media and Biological Samples
Abstract
Phosphate ions perform a variety of functions in metabolic processes and are essential for all living organisms. The determination of the concentration of phosphate ions is useful in clinical diagnosis of various diseases as an inadequate phosphate level could lead to many health problems. In the search for a cost-effective method of fast monitoring, we investigated the use of cobalt ferrite nanoparticles (CoFeNPs) in the selective recognition of phosphate ions dissolved in aqueous media and more complex samples, such as human blood serum. We prepared these NPs by a chemical coprecipitation route and subjected them to annealing at 600 °C for 1 h. The successful formation of the NPs was confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and hysteresis loop measurements. The NPs exhibited a ferrimagnetic behavior, a spinel-type crystalline structure, and hexagonal shape in the nanoscale range. We demonstrated that CoFeNPs containing immobilized fluorescent-labeled single-chain DNA (ssDNA*) probes can be applied for the fast selective detection of phosphate ions dissolved in a liquid medium. We have explored the fact that phosphate groups can displace ssDNA* probes attached to the nanoparticles, therefore causing a perceptible change in the fluorescence signal of the supernatant liquid. This detection method has been tested for the sensing of phosphate ions present both in aqueous solutions and in biological samples, with excellent selectivity and a low limit of detection (∼1.75 nM).
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“In this context, perovskite materials facilitate signal conversion and amplification, transforming the subtle changes generated by the antibody-antigen interaction into measurable signals [71].”
From Design Strategies and Emerging Applications of Perovskite-Based Sensors (2025) · cites this paper as [71]
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“Among them, perovskite materials play a role in signal conversion and enhancement, transforming the minute changes produced by hybridization reactions into measurable signals (Figure 3H) [71].”
From Design Strategies and Emerging Applications of Perovskite-Based Sensors (2025) · cites this paper as [71]
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Metadata
- Authors
- Ratkovski, G. P., do Nascimento, K. T. O., Pedro, G. C., Ratkovski, D. R., Gorza, F. D. S., da Silva, R. J., Maciel, B. G., Mojica-Sánchez, L. C., & de Melo, C. P.
- Affiliations
- Universidade Federal de Pernambuco (BR)
- Corresponding author
- de Melo, Celso P.
- ORCID
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-03-02
- Volume
- 36
- Issue
- 11
- Pages
- 2920-2929
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W3009475981
- Cited by
- 40
- References
- 60
- Citations by year
- 2026: 5 · 2025: 7 · 2024: 9 · 2022: 6 · 2021: 11 · 2020: 2
- FWCI
- 1.54
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Langmuir (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Funda??o de Amparo ? Ci?ncia e Tecnologia do Estado de Pernambuco
- Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
- Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
- Funda??o Nacional de Sa?de
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Advanced biosensing and bioanalysis techniques
- Physical Sciences › Chemistry › Spectroscopy › Molecular Sensors and Ion Detection
- Physical Sciences › Materials Science › Materials Chemistry › Magnetic Properties and Synthesis of Ferrites
- Keywords
- cobalt ferrite nanoparticles, phosphate ion detection, fluorescent DNA probes, spinel ferrite, chemical coprecipitation, annealing, fluorescence sensing, human serum, aqueous media, ferrimagnetic nanoparticles
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