β-Cyclodextrin coated CdSe/ZnS quantum dots for vanillin sensoring in food samples

Durán, Gema M.; Contento, Ana M.; Ríos, Ángel

doi:10.1016/j.talanta.2014.07.100

Cited by 47 publications

(21 citation statements)

References 27 publications

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“…Since urine is mainly composed of amino acids, glucose and anions/cations, our recovery results further confirm that these co-existing biomolecules do not significantly interfere with the DA detection in diluted urine samples. Using this approach, similar results were reported to detect AA, vanillin, cyanide ions and organophosphate in urine, food, tap/ground and lake water, respectively (Bian et al, 2013;Duran et al, 2015;Shamsipur et al, 2014;Zhang et al, 2014). Finally, our findings reveal the potential applicability and accuracy of our ZnS:Mn phosphorescent probes to detect DA in biological fluids with high sensitivity and selectivity.…”

Section: Effect Of the Mediumsupporting

confidence: 85%

L-cysteine capped ZnS:Mn quantum dots for room-temperature detection of dopamine with high sensitivity and selectivity

Diaz-Diestra

Thapa

Beltran‐Huarac

et al. 2017

Biosensors and Bioelectronics

116

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Dopamine (DA) is one of the most important catecholamine neurotransmitters of the human central nervous system, and is involved in many behavioral responses and brain functions. Below normal DA levels in biological fluids can lead to different neurodegenerative conditions. For excess DA levels, a failure in energy metabolism is indicated. In this study, a facile room-temperature phosphorescence sensor is developed to detect DA based on l-cysteine capped Mn doped ZnS quantum dots (l-cys ZnS:Mn QDs). The QDs display a prominent orange emission band peaking at ~598nm, which is strongly quenched upon addition of DA in alkaline medium. The sensor exhibits a linear working range of ~0.15-3.00μM, and a limit of detection of ~7.80nM. These results are explained in terms of a pH-dependent electron transfer process, in which the oxidized dopamine quinone functions as an efficient electron acceptor. The QDs-based sensor shows a high selectivity to DA over common interfering biomolecules (including some amino acids, ascorbic acid, chloride and glucose). The sensor has been successfully applied for the detection of DA in urine samples, yielding recoveries as high as 93%. Our findings indicate that our developed sensor exhibits high sensitivity and reproducibility to determine DA even in biological fluids where DA is at low levels, e.g., in the central nervous system, which is the usual clinical profile of a neurodegenerative disorder associated to the Parkinson's disease.

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Section: Effect Of the Mediumsupporting

confidence: 85%

L-cysteine capped ZnS:Mn quantum dots for room-temperature detection of dopamine with high sensitivity and selectivity

Diaz-Diestra

Thapa

Beltran‐Huarac

et al. 2017

Biosensors and Bioelectronics

116

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“…Vanillin, which exists in sugar beet and vanilla pods, is one of the most popular flavoring substances and it is widely used in food, beverages, perfumery and pharmaceutical industries [20][21][22]. Vanillin has been identified as a bio-based crosslinking agent due to its aldehyde.…”

Section: Introductionmentioning

confidence: 99%

Enhancing mechanical properties of chitosan films via modification with vanillin

Zhang

Han

Zeng

et al. 2015

International Journal of Biological Macromolecules

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“…8 Briey, 1 mL (200 mg L À1 ) of TOPO-capped CdSe/ZnS QDs in chloroform (0.2 mg) was added to a 5 mL polypropylene vial and the chloroform was dried under the nitrogen atmosphere. 8 Briey, 1 mL (200 mg L À1 ) of TOPO-capped CdSe/ZnS QDs in chloroform (0.2 mg) was added to a 5 mL polypropylene vial and the chloroform was dried under the nitrogen atmosphere.…”

Section: Synthesis and Surface Modication Of Cdse/zns Qdsmentioning

confidence: 99%

A continuous method incorporating β-cyclodextrin modified CdSe/ZnS quantum dots for determination of ascorbic acid

2015

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A flow system using water-soluble CdSe/ZnS quantum dots modified with b cyclodextrin (b-CD) was developed for the determination of ascorbic acid. The system was based on the quenching effect produced by ascorbic acid on the fluorescence intensity of surface modified QDs with b-CD. Under the optimized conditions, the relationship between the fluorescence intensity of the b-CD-CdSe/ZnS-QDs and ascorbic acid concentration was linear in the 2-100 mg L À1 range. LOD and LOQ values of 0.6 and 2.0 mg L À1 were obtained, respectively. A reproducibility of 4.2% in terms of relative standard deviation (3.2% under repeatability conditions) was obtained. The proposed methodology was applied to the determination of ascorbic acid in fruit juices and a pharmaceutical formulation. The results obtained were in good agreement with both the titrimetric method and the amount specified by the manufacturer, thus indicating the usefulness of the proposed methodology in the alimentary field.

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β-Cyclodextrin coated CdSe/ZnS quantum dots for vanillin sensoring in food samples

Cited by 47 publications

References 27 publications

L-cysteine capped ZnS:Mn quantum dots for room-temperature detection of dopamine with high sensitivity and selectivity

L-cysteine capped ZnS:Mn quantum dots for room-temperature detection of dopamine with high sensitivity and selectivity

Enhancing mechanical properties of chitosan films via modification with vanillin

A continuous method incorporating β-cyclodextrin modified CdSe/ZnS quantum dots for determination of ascorbic acid

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