A Magnetic Biomimetic Nanocatalyst for Cleaving Phosphoester and Carboxylic Ester Bonds under Mild Conditions
摘要:
As a result of the unique surface structure of nanospheres, Asp and His residues supported on a 12 nm maghemite nanoparticle worked collaboratively as a biomimetic nanocatalyst for hydrolyzing paraoxon (phosphoester) and 4-nitrophenyl acetate (carboxylic ester) in Milli-Q water (pH 7.0) at 37 degrees C, without employing extremes of pH or heavy metals. Our nanocatalyst could be facilely recovered via magnetic concentration. The isolated catalyst exhibited long-term stability, showing no significant loss of its catalytic activity for repeated uses after 3 months.
Magnetic Assembly and Patterning of Vesicle/Nanoparticle Aggregates
作者:Kwan Ping Liem、Robert J. Mart、Simon J. Webb
DOI:10.1021/ja075000e
日期:2007.10.1
that mimic tissue, patterned vesicle assemblies composed of phospholipid vesicles cross-linked by magnetic nanoparticles have been developed. Multivalent binding between synthetic adhesive lipids in the vesicle membranes and histidine-coated magnetite nanoparticles resulted in the reversible formation of large nanoparticle/vesicle aggregates. The nanoparticles did not insert into or otherwise disrupt