A novel optical sensor for uranium determination

Safavi, Afsaneh; Bagheri, Mozhgan

doi:10.1016/j.aca.2004.08.063

Cited by 69 publications

(25 citation statements)

References 15 publications

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“…Therefore, although on-site and realtime detection of uranium is difficult (21), it is also the most desirable for assessing uranium contamination problems and the effectiveness of remediation strategies. Chemical and biological sensors for UO 2 2ϩ , although available, cannot match the above instrumental analysis methods in sensitivity or selectivity (22)(23)(24)(25)(26). Perhaps the most challenging aspect of this sensor design is selectivity over Th(IV), because Th(IV) almost always coexists with uranium.…”

mentioning

confidence: 99%

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

Liu

Brown

Meng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

482

476

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Here, we report a catalytic beacon sensor for uranyl (UO 2 2؉ ) based on an in vitro-selected UO 2 2؉ -specific DNAzyme. The sensor consists of a DNA enzyme strand with a 3 quencher and a DNA substrate with a ribonucleotide adenosine (rA) in the middle and a fluorophore and a quencher at the 5 and 3 ends, respectively. The presence of UO 2 2؉ causes catalytic cleavage of the DNA substrate strand at the rA position and release of the fluorophore and thus dramatic increase of fluorescence intensity. The sensor has a detection limit of 11 parts per trillion (45 pM), a dynamic range up to 400 nM, and selectivity of >1-million-fold over other metal ions. The most interfering metal ion, Th(IV), interacts with the fluorescein fluorophore, causing slightly enhanced fluorescence intensity, with an apparent dissociation constant of Ϸ230 M. This sensor rivals the most sensitive analytical instruments for uranium detection, and its application in detecting uranium in contaminated soil samples is also demonstrated. This work shows that simple, cost-effective, and portable metal sensors can be obtained with similar sensitivity and selectivity as much more expensive and sophisticated analytical instruments. Such a sensor will play an important role in environmental remediation of radionuclides such as uranium.DNA ͉ DNAzyme ͉ fluorescence ͉ deoxyribozyme ͉ catalytic DNA

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mentioning

confidence: 99%

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

Liu

Brown

Meng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

482

476

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“…As we mentioned previously, so far, several rapid methods including colorimetric sensors [8,9,22], fluorescent sensor [21] and magnetoelastic sensor [23] have been developed for detecting UO 2 2+ . In comparison with previous colorimetric sensors [8,9,22], the proposed biosensor has higher sensitivity, similar or more excellent selectivity and short analysis time. Compared to the previous fluorescent sensor [21], the proposed biosensor is more simple and cost-effective although the sensitivity and selectivity of both are similar.…”

Section: +mentioning

confidence: 99%

“…The previously mentioned limitations of traditional techniques have pushed researchers to develop novel methods for the rapid, sensitive and specific detection of uranyl ion in the field. Along this goal, a few chemical sensors have been developed for the rapid detection of UO 2 2+ [8][9][10]. However, these methods have lower sensitivity and relatively poor selectivity, which do not meet the requirement of rapid and on-site detection of trace UO 2 2+ in aqueous environment.…”

Section: Introductionmentioning

confidence: 99%

A turn-off fluorescent biosensor for the rapid and sensitive detection of uranyl ion based on molybdenum disulfide nanosheets and specific DNAzyme

Zhang

Ruan

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Other advantages include simple and low cost preparation, ease of miniaturization, possibility of remote, in situ monitoring and no need for separate reference devices. 18,19 These features make optochemical sensors as a powerful tool for environmental and industrial process monitoring.…”

Section: Introductionmentioning

confidence: 99%

Development of an optical redox chemical sensor for nitrite determination

Rastegarzadeh¹,

Kalantaripour²

2012

Quím. Nova

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Recebido em 18/7/11; aceito em 14/10/11; publicado na web em 20/1/12An optical chemical sensor for the determination of nitrite based on incorporating methyltrioctylammonium chloride as an anionic exchanger on the triacetylcellulose polymer has been reported. The response of the sensor is based on the redox reaction between nitrite in aqueous solution and iodide adsorbed on sensing membrane using anion exchange phenomena. The sensing membrane reversibly responses to nitrite ion over the range of 6.52×10 -6 -8.70×10 -5 mol L -1 with a detection limit of 6.05×10 -7 mol L -1 (0.03 mg mL -1) and response time of 6 min. The relative standard deviation for eight replicate measurements of 8.70×10-6 and 4.34×10-5mol L -1 of nitrite was 4.4 and 2.5 %, respectively. The sensor was successfully applied for determination of nitrite in food, saliva and water samples.

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A novel optical sensor for uranium determination

Cited by 69 publications

References 15 publications

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

A catalytic beacon sensor for uranium with parts-per-trillion sensitivity and millionfold selectivity

A turn-off fluorescent biosensor for the rapid and sensitive detection of uranyl ion based on molybdenum disulfide nanosheets and specific DNAzyme

Development of an optical redox chemical sensor for nitrite determination

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