PEG-ylated cationic CdSe/ZnS QDs as an efficient intracellular labeling agent
作者:Junghan Lee、Junwon Kim、Eunjung Park、Shineun Jo、Rita Song
DOI:10.1039/b801317a
日期:——
Quantum dots (QDs) have size-tunable optical properties, such as photostability, strong photoluminescence and a large Stokes-shift, which make it possible to adapt them to various biological applications. In many cases, surface modification of QDs by carboxylate ligands has been extensively studied. However, there have been few applications on QDs modified with a potential cationic ligand such as amine. In this study, we synthesized robust amine-functionalized QDs and modified their surface with poly(ethylene glycol) for long-term stability. These QDs showed an excellent stability over a broad pH-range and remarkable internalization efficiency into living cells.
Fluorogenic assay and live cell imaging of HIV-1 protease activity using acid-stable quantum dot–peptide complex
作者:Youngseon Choi、Junghan Lee、Keumhyun Kim、Heeyeon Kim、Peter Sommer、Rita Song
DOI:10.1039/c0cc02702b
日期:——
A novel QD-peptide complex for detecting HIV-1 protease activity was prepared from simple one step electrostatic interaction. Fluorescence recovery of the pre-quenched QD through fluorescence resonance energy transfer allowed for in vitro assay and live cell imaging of the protease activity in HIV-1 transfected cells, proving the potential for cell-based protease inhibitor screening.
An imine-based approach to prepare amine-functionalized Janus gold nanoparticles
作者:Shaojue Wu、Si Yu Tan、Chung Yen Ang、Kim Truc Nguyen、Menghuan Li、Yanli Zhao
DOI:10.1039/c5cc03582a
日期:——
An imine-based approach was developed to prepare Janus gold nanoparticles having amine functionality on one patch of the surface and a polyethylene glycol unit on the other.
[EN] APPLICATION OF HETEROCYCLIC COMPOUND CONTAINING AT LEAST TWO SULFUR ATOMS IN PREPARING NANO-VACCINE AND PREPARED NANO-VACCINE<br/>[FR] APPLICATION D'UN COMPOSÉ HÉTÉROCYCLIQUE CONTENANT AU MOINS DEUX ATOMES DE SOUFRE DANS LA PRÉPARATION DE NANO-VACCIN ET NANO-VACCIN PRÉPARÉ<br/>[ZH] 含有至少2个硫原子的杂环化合物在制备纳米疫苗中的应用及制得的纳米疫苗
Lipoic Acid Glyco-Conjugates, a New Class of Agents for Controlling Nonspecific Adsorption of Blood Serum at Biointerfaces for Biosensor and Biomedical Applications
The carbohydrate-derived lipoic acid derivatives were Studied as protein and cell resistant biomaterials. Six types of carbohydrates were examined for their abilities to reduce nonspecific adsorption of human serum and Hela cell using quartz crystal microbalance. Our data Suggested that the Structures of carbohydrates play an important role in resisting nonspecific binding. Specifically, the resistance was found to increase in the order lipoic fucose < lipoic mannose < lipoic N-acetyl glucosamine < lipoic glucose < lipoic sialic acid < lipoic galactose, where lipoic galactose derivative resisted most nonspecific adsorption. Furthermore, the combination of lipoic galactose and BSA was the most effective in reducing the adsorption of even undiluted human serum and the attachment of Hela cells while allowing specific binding. Several control experiments have demonstrated that the resistant-ability of mixed lipoic galactose and BSA was comparable to the best known system for decreasing nonspecific adsorption.