β-Cyclodextrin-Modified CdSe/ZnS Quantum Dots for Sensing and Chiroselective Analysis

Freeman, Ronit; Finder, Tali; Bahshi, Lily; Willner, Itamar

doi:10.1021/nl900470p

Cited by 250 publications

(168 citation statements)

References 38 publications

(18 reference statements)

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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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“…It is worth noting that this approach has already been explored using small organic molecules instead of polymers. The QDs are in that case coated with amphiphilic phospholipids, 26 calixarenes 27,28 or cyclodextrins [29][30][31] to achieve the same goal. Besides, the silicacoating method [32][33][34][35][36] has also been used to tailor QDs for gaining solubilization and functionalization to conjugate with biofunctional molecules.…”

Section: Surface Stabilization Chemistrymentioning

confidence: 99%

Quantum dots, lighting up the research and development of nanomedicine

Wang

Chen

2011

Nanomedicine: Nanotechnology, Biology and Medicine

244

119

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“…CDs can be used as modified surface agent in the synthesis of nanostructure materials. Zhao and Chen have synthesized multi-petals ZnO nano-structure in the presence ofcyclodextrin and they found that if not using -CD in the preparation process, only larger rods could be obtained [10] and according to recent report, -Cyclodextrin ( -CD)-functionalized CdSe/ZnS quantum dots (QDs) apply for optical sensing [11]. To develop functional nanowebs, Uyar et al have synthesized cyclodextrin functionalized polyethylene oxide (PEO) nanofibers (PEO/CD) [12].…”

Section: Cyclodextrins (Cds)mentioning

confidence: 99%