Journal ArticleDOI
Sensitive and selective detection of adenine using fluorescent ZnS nanoparticles.
TLDR
Steady-state fluorescence experiments suggest that one molecule of adenine is sufficient to quench the emission arising from a cluster of ZnS consisting of about 20 molecules, and time-resolved fluorescence measurements indicate that theadenine molecules block the sites on the surface ofZnS responsible for emission with the longest lifetime component.Abstract:
We have used fluorescent ZnS nanoparticles as a probe for the determination of adenine. A typical 2 × 10(-7) M concentration of adenine quenches 39.3% of the ZnS fluorescence. The decrease in ZnS fluorescence as a function of adenine concentration was found to be linear in the concentration range 5 × 10(-9)-2 × 10(-7) M. The limit of detection (LOD) of adenine by this method is 3 nM. Among the DNA bases, only adenine quenched the fluorescence of ZnS nanoparticles in the submicromolar concentration range, thus adding selectivity to the method. The amino group of adenine was important in determining the quenching efficiency. Steady-state fluorescence experiments suggest that one molecule of adenine is sufficient to quench the emission arising from a cluster of ZnS consisting of about 20 molecules. Time-resolved fluorescence measurements indicate that the adenine molecules block the sites on the surface of ZnS responsible for emission with the longest lifetime component. This method may be applied for the determination of adenine in biological samples since the measurements have been carried out at pH 7.read more
Citations
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Application of quantum dots as analytical tools in automated chemical analysis: a review.
Christian Frigerio,David S.M. Ribeiro,S. Sofia M. Rodrigues,Vera L.R.G. Abreu,João Roberto Barbosa,João A.V. Prior,Karine L. Marques,João L.M. Santos +7 more
TL;DR: In this review, insights are provided into the analytical potential of quantum dots focusing on prospects of their utilisation in automated flow-based and flow-related approaches and the future outlook of QDs applications in chemical analysis.
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Nucleobases, nucleosides, and nucleotides: versatile biomolecules for generating functional nanomaterials
Fang Pu,Jinsong Ren,Xiaogang Qu +2 more
TL;DR: In this review, strategies for the synthesis of nanomaterials and the regulation of their morphologies and functions using nucleobases, nucleosides, and nucleotides as building blocks, templates or modulators are summarized alongside selected applications.
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Nanophotonics for Molecular Diagnostics and Therapy Applications
TL;DR: The uses of nanobiophotonics for molecular diagnostics involving specific sequence characterization of nucleic acids and for gene delivery systems of relevance for therapy strategies and the translation of nanophotonic for theranostics into the clinical setting will be discussed.
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Interaction study of human serum albumin and ZnS nanoparticles using fluorescence spectrometry
TL;DR: In this article, the interaction of ZnS nanoparticles (NPs) with human serum albumin (HSA) using florescence spectroscopy was investigated using modified Stern-Volmer equation.
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A silica nanoparticle-based sensor for selective fluorescent detection of homocysteine via interaction differences between thiols and particle-surface-bound polymers.
TL;DR: A new mesoporous silica nanoparticle-based sensor for selective detection of homocysteine from biothiols and other common amino acids and may offer an approach for designing other MSN-based sensing systems by using polymers as diffusion regulators in sensing assays for other analytes.
References
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Journal ArticleDOI
Synthesis and Characterization of Strongly Luminescing ZnS-Capped CdSe Nanocrystals
TL;DR: In this paper, the authors describe the synthesis of ZnS-capped CdSe semiconductor nanocrystals using organometallic reagents by a two-step single-flask method X-ray photoelectron spectroscopy, transmission electron microscopy and optical absorption.
Journal ArticleDOI
Photochemistry of colloidal semiconductors. 20. Surface modification and stability of strong luminescing CdS particles
TL;DR: The preparation of CdS sols with a mean diameter between 40 and 60 A and a relatively narrow size distribution is described in this paper, where the colloids could be separated as solids, which in turn could be redissolved to give solutions of some 10/sup -2/M.
Journal ArticleDOI
Photoluminescence and photoinduced oxygen adsorption of colloidal zinc sulfide dispersions
William G. Becker,Allen J. Bard +1 more
TL;DR: Etudes de suspensions colloidales aqueuses de ZnS et de la relation entre l'intensite d'emission and la distribution spectrale, et des facteurs tels que la concentration du dopant Mn 2+, the presence d'oxygene dissous ou d'ions sulfure en solution, the presence de lacunes dans le reseau de soufre, the photodegradation and l'extinction de la luminescence par des reactifs en solution.
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Amine-capped ZnS-Mn2+ nanocrystals for fluorescence detection of trace TNT explosive.
TL;DR: The ion-doped nanocrystal sensors reported here show a remarkable air/solution stability, high quantum yield, and strong analyte affinity and, therefore, are well-suited for detecting the ultratrace TNT and distinguishing different nitro compounds.
Journal ArticleDOI
Peptide-coated CdS quantum dots for the optical detection of copper(II) and silver(I)
TL;DR: Gly-His-Leu- leu- Leu-Cys coated CdS quantum dots detected Cu2+ and Ag+ selectively with high sensitivity, below 0.5 microM.