Zwitterionic Ligands Bound to Cdse/Zns Quantum Dots Prevent Adhesion to Mammalian Cells
摘要:
Zwitterionic materials are useful tools in material science and biology as they provide high water solubility while preventing nonspecific interactions. Quantum dots (QDs) functionalized with zwitterionic and quaternary ammonium ligands were synthesized to investigate their interactions with the outer membrane of HeLa cells. Quaternary ammonium functionalized quantum dots adhered strongly to the cell surface while zwitterionic QDs had no cell adhesion. These results demonstrate that future noninteracting nanoparticles based on this design are possible.
Reversible Control of Nanoparticle Functionalization and Physicochemical Properties by Dynamic Covalent Exchange
作者:Flavio della Sala、Euan R. Kay
DOI:10.1002/anie.201409602
日期:2015.3.27
methods for the covalentfunctionalization of nanoparticles rely on kinetically controlled reactions, and largely lack the sophistication of the preeminent oligonucleotide‐based noncovalent strategies. Here we report the application of dynamiccovalent chemistry for the reversible modification of nanoparticle (NP) surface functionality, combining the benefits of non‐biomolecular covalent chemistry with
作者:Marta Diez‐Castellnou、Rongtian Suo、Nicolas Marro、Saphia A. L. Matthew、Euan R. Kay
DOI:10.1002/chem.202101042
日期:2021.7.7
Tunable surface densities of reactive aldehyde functionalities are revealed on-demand, leading to a wide range of adaptivesurfaceengineering options from one nanoscale synthon. Analytically tractable with molecular precision, interfacial reaction kinetics and dynamic surface constitutions can be probed in situ at the ensemble level. High functionalization densities combined with rapid equilibration
Drug delivery devices, sensors, and micropumps provided herein can utilize a reaction of an analyte triggered by an enzyme to drive fluid flow. In some cases, a drug delivery device can include a reservoir including a drug (e.g., insulin) and have an enzyme (e.g., glucose oxidase) positioned adjacent to said reservoir. The enzyme can catalyze a reaction of said analyte to drive a fluid flow adjacent to said reservoir to increase a release of the drug from said reservoir. A sensor for an analyte can include an enzyme bound to a surface and a flow meter to detect a flow of fluids adjacent to said surface. A self-powered enzyme micropump provided herein can provide precise control over flow rate in response to specific signals.
Ligand Conjugation of Chemically Exfoliated MoS<sub>2</sub>
作者:Stanley S. Chou、Mrinmoy De、Jaemyung Kim、Segi Byun、Conner Dykstra、Jin Yu、Jiaxing Huang、Vinayak P. Dravid
DOI:10.1021/ja310929s
日期:2013.3.27
MoS2 is a two-dimensional material that is gaining prominence due to its unique electronic and chemical properties. Here, we demonstrate ligand conjugation of chemicallyexfoliatedMoS2 using thiol chemistry. With this method, we modulate the ζ-potential and colloidal stability of MoS2 sheets through ligand designs, thus enabling its usage as a selective artificial protein receptor for β-galactosidase