Preparation and application of l-cysteine-modified CdSe/CdS core/shell nanocrystals as a novel fluorescence probe for detection of nucleic acid

Impact of reaction variables and PEI/l-cysteine ratio on the optical properties and cytocompatibility of cationic Ag2S quantum dots as NIR bio-imaging probes

“…25 Here, we developed cationic Ag 2 S NIRQDs with a mixed coating comprised of branched PEI of different molecular weights and cysteine (Cys) with the aim of understanding the effect of Cys as a part of the coating composition and investigated the inuence of PEI/Cys ratio on emission tunability, stability, quantum yield and cytotoxicity. Cys is an aminoacid without any cytotoxin and is used for the synthesis of watersoluble nanocrystals such as CdS, 26 CdSe, 27 CdSe/CdS, 28 CdTe, 29 and CdTe/Cd(OH) 2 . 30 The mercapto group of Cys provides a strong binding to the crystal surface.…”

Quantum Dots — Characterization, Preparation and Usage in Biological Systems

“…QDs are excellent candidates for biosensing owing to their unique physical and optical properties and possibility of attaching various biomolecules to their surface [ 36 ]. Some new assays of QDs’ usage, which can improve the current methods of DNA and protein detection, were performed [ 37 , 38 ]. For example, a detection method of adenosine-triphosphate (ATP) using a QD tagged aptamer (nucleic acids that bind to certain molecular targets such as thrombin, adenosine, or cocaine) has been described [ 39 ].…”

Aqueous synthesis of thioglycollic acid-capped Tb3+-doped cadmium sulfur quantum dots

“…Compared with the organic synthetic methods, the aqueous synthesis methods are advantageous owing to its being simple, green, and highly reproducible, and its products exhibit good water solubility, stability, and biological compatibility. [7][8][9] The properties of QDs can be further adjusted, for instance, by doping impurity atoms in the NCs, the range of tunable fluorescence can be expanded, the stability of QDs can be improved, and magnetic properties can be introduced. [10][11][12] Daocheng's group synthesized Cu þ -and Ag þ -doped Zn x Cd 1Àx S/ZnS QDs through an easy and green method using hydrophilic glutathione as capping agent.…”