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Hollow gold nanoparticles encapsulating horseradish peroxidase

Paper ID Volume ID Publish Year Pages File Format Full-Text
10996 711 2005 11 PDF Available
Title
Hollow gold nanoparticles encapsulating horseradish peroxidase
Abstract

Hollow nanoshells of gold entrapping an enzyme, horseradish peroxidase (HRP), in the cavity of the nanoshell have been prepared in the reverse micelles by leaching out silver chloride (AgCl) from AushellAgClcore nanoparticles with dilute ammonia solution. The particles have been characterised by dynamic laser light scattering (DLS), transmission electron microscopy (TEM), X-ray diffraction (XRD), and electron diffraction. The particle size is below 100 nm diameter, depending upon the size of the aqueous core of reverse micelles in which these particles have been prepared. This soft-chemical method for the preparation of such particles allows the entrapped enzyme to remain active inside the hollow gold nanoparticles. Small substrate molecules such as o-dianisidine can easily enter through the pores of the nanoshell and can undergo enzymatic oxidation by H2O2. The enzyme kinetics follows Michaelis–Menten mechanism. When the substrate is chemically conjugated with dextran molecule (10 kDa), the enzymatic reaction is practically completely prevented perhaps by the inability of dextran-o-dianisidine conjugate to penetrate the pores of the nanoshells. However, HRP did not show any activity when trapped inside solid gold nanoparticles.

Keywords
Hollow gold nanoparticles; Aushell AgClcore nanoparticles; Enzyme entrapment; Horseradish peroxidase (HRP); Dextran-o-dianisidine
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 33, November 2005, Pages 6743–6753
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us