Heterodimers of Nanoparticles: Formation at a Liquid−Liquid Interface and Particle-Specific Surface Modification by Functional Molecules
作者:Hongwei Gu、Zhimou Yang、Jinhao Gao、C. K. Chang、Bing Xu
DOI:10.1021/ja045220h
日期:2005.1.1
On the basis of a fundamental property of nanoparticles, the self-assembling at a liquid-liquidinterface to form "colloidosomes", a heterogeneous reaction takes place on the exposed surface of the nanoparticles to produce the heterodimers of two distinct nanospheres, which can be modified by two different functional molecules in a particle-specific manner.
Design and synthesis of a photocleavable biotin-linker for the photoisolation of ligand–receptor complexes based on the photolysis of 8-quinolinyl sulfonates in aqueous solution
The ability of avidin (Avn) to form strong complex with biotin (Btn) is frequently used in the detection and isolation of biomolecules in biochemical, analytical, and medicinal research. The fact that the binding is nealy irreversible, however, constitutes a drawback in term of the isolation and purification of intact biomolecules. We recently found that 8-quinolinyl esters of aromatic or aliphatic sulfonic acids undergo photolysis when irradiated at 300-330 nm in aqueous solution at neutral pH. In this work, a biotin-dopamine (BD) conjugate containing a photocleavable 8-quinolinyl benzenesulfonate (QB) linker, BDQB, was designed and synthesized for use in the efficient recovery of dopamine-protein (e.g., antibody) complexes from an Avn-Btn system. The complexation of BDQB with a primary anti-dopamine antibody (anti-dopamine IgG(1) from mouse) on an Avn-coated plate was confirmed by an enzyme-linked immunosorbent assay ( ELISA) utilizing a secondary antibody (anti-IgG(1) antibody) conjugated with horseradish peroxidase (HRP). Upon the photoirradiation (at 313 nm) of the BDQB-IgG(1) complex, the release of dopamine-IgG(1) complex was confirmed by ELISA. Characterization of the resulting photoreleased dopamine anti-dopamine IgG(1) complex was performed by SDS-PAGE and Western blot. (C) 2009 Elsevier Ltd. All rights reserved.
Conversion of Magnetic Impulses into Cellular Responses by Self-Assembled Nanoparticle-Vesicle Hydrogels
作者:Felicity de Cogan、Andrew Booth、Julie E. Gough、Simon J. Webb
DOI:10.1002/anie.201103469
日期:2011.12.16
Crosslinking vesicles with magnetic nanoparticles produced MNPVs, self‐assembled “nanopills” that can be “unlocked” by an alternating magnetic field (AMF), releasing chemical messengers stored within the vesicles. When MNPVs are co‐immobilized with cells in a hydrogel matrix, exposure to an AMF magnetic signal releases the chemical messengers, which then induce a cellularresponse.