RETRACTED: Mercaptoacetic acid capped CdS quantum dots as fluorescence single shot probe for mercury(II)

Koneswaran, Masilamany; Narayanaswamy, Ramaier

doi:10.1016/j.snb.2008.09.011

Cited by 150 publications

(74 citation statements)

References 29 publications

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“…The interdigitated bilayer structure of CTAB-TOPO-coated CdSe/ZnS QD, whose first layer was original surface ligands TOPO and the second layer was CTAB, made it a more sensitive and selective fluorescence probe than CdSe/ZnS QD to the quenchers [46]. Similar organic coated bilayer structures of water-soluble CdSe/ZnS QDs were also investigated by others as fluorescence quenching probes for selective detection and quantification of analytes like chloride anion [47], hypochlorite [48], heavy metal ions [27][28][29][30]49], nitroaromatic [50] and even chiral mixtures of enantiomers [51,52].…”

Section: Comparison Of Oil-soluble Qds and Water-soluble Ctab-coated Qdsmentioning

confidence: 99%

Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Xiong

et al. 2014

Sensors and Actuators B: Chemical

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a b s t r a c tVegetable cooking oils adulterated with inedible used oils or impure oils have posed a severe food safety problem. Current detection methods cannot meet the needs for rapid detection of adulterated oils on line or in field. Therefore, the objective of this research was to develop a rapid optical sensing method based on fluorescence quenching of CdSe/ZnS quantum dots (QDs) for identification of adulterated vegetable cooking oils. High quality hydrophilic photoluminescent nanoparticles were synthesized by encapsulating hydrophobic QDs into the micellar structure of an amphiphilic surfactant cetyltrimethyl ammonium bromide (CTAB) via phase transfer method. TEM, AFM, and fluorescence spectroscopy were used to characterize the prepared CTAB-coated QDs. Oil samples were first captured into the core of the twolayer-structural micelle and then the fluorescence of CTAB-coated QDs, working as fluorescence probes, was selectively quenched by components of the adulterated oils. Heavy metal ions and free radicals were presumed to be main quenchers. After quenching for 1 min, fluorescence intensity was measured and converted to quenching percentage to determine the adulteration concentration. The results showed that in comparison with oil-soluble QDs, water-soluble CTAB-coated QDs had a greater ability to identify oil adulteration. A good quantitative relationship between quenching percentage and adulteration concentration (y = 5.96x + 14.99; R 2 = 0.94) was obtained. The sensitive, simple and low-cost sensing method did not require sample pretreatment and could detect refined used oils at 0.4% or higher concentrations in soybean oil within 2 min, showing great potentials for rapid screening of used oils and quantitative analysis of used oil adulteration in field.

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Section: Comparison Of Oil-soluble Qds and Water-soluble Ctab-coated Qdsmentioning

confidence: 99%

Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Xiong

et al. 2014

Sensors and Actuators B: Chemical

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“…The presence of the mercury ion was signaled by the fluorescence quenching of the QDs which was shown to be linearly proportional to the mercury ion concentration. Limits of detection in the nanomolar range were reported for these sensors (144). However, due to concerns related to the potential toxicity of cadmium, a modified mercury sensor was developed.…”

Section: Quantum Dotsmentioning

confidence: 99%

Nanotechnology Solutions for Global Water Challenges

McGuinness

Garvey

Whelan

et al. 2015

ACS Symposium Series

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The lack of clean and safe drinking water is responsible for more deaths than war, terrorism and weapons of mass destruction combined. This suggests contaminated water poses a significant threat to human health and welfare. In addition, standard water disinfection approaches such as sedimentation, filtration, and chemical or biological degradation are not fully capable of destroying emerging contaminants (e.g. pesticides, pharmaceutical waste products) or certain types of bacteria (e.g. Cryptosporidium parvum). Nanomaterials and nanotechnology based devices can potentially be employed to solve the challenges posed by various contaminants and

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“…The main characteristics for fluorimetric determination of Hg 2 þ with QDs systems [2,7,22,[31][32][33][34] were summarized in Table 2 The proposed method has been applied to the determination of Hg 2 þ in water samples (Table 3). The water samples were filtered four times through qualitative filter paper before use.…”

Section: Analytical Performance Of Cdte-dob Qds For Hg 2 þmentioning

confidence: 99%

“…Heavy metal mercury is a hazardous contaminant of environment which can be accumulated in organisms and interact with the proteins and thymine-thymine bases in DNA duplexes [1] to cause a serious threat to human health even at very low concentration level [2,3]. The development of new methods for the quantification of mercury at ultra-trace levels is a challenging task and one of considerable interests.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive synchronous fluorescence determination of mercury (II) based on the denatured ovalbumin coated CdTe QDs

Wang

Liu

et al. 2012

Talanta

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RETRACTED: Mercaptoacetic acid capped CdS quantum dots as fluorescence single shot probe for mercury(II)

Cited by 150 publications

References 29 publications

Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Nanotechnology Solutions for Global Water Challenges

Highly sensitive synchronous fluorescence determination of mercury (II) based on the denatured ovalbumin coated CdTe QDs

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