Open Access Nano Express

Preparation and Characterization of Stimuli-Responsive Magnetic Nanoparticles

ShiXing Wang12*, Yang Zhou12, Wen Guan1 and Bingjun Ding1

Author Affiliations

1 School of Science, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an, Shanxi, 710049, China

2 National Center for Nanoscience and Technology, Beijing, China

For all author emails, please log on.

Nanoscale Research Letters 2008, 3:289-294  doi:10.1007/s11671-008-9151-3

Published: 7 August 2008

Abstract

In this work, the main attention was focused on the synthesis of stimuli-responsive magnetic nanoparticles (SR-MNPs) and the influence of glutathione concentration on its cleavage efficiency. Magnetic nanoparticles (MNPs) were first modified with activated pyridyldithio. Then, MNPs modified with activated pyridyldithio (MNPs-PDT) were conjugated with 2, 4-diamino-6-mercaptopyrimidine (DMP) to form SR-MNPs via stimuli-responsive disulfide linkage. Fourier transform infrared spectra (FTIR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize MNPs-PDT. The disulfide linkage can be cleaved by reduced glutathione (GHS). The concentration of glutathione plays an important role in controlling the cleaved efficiency. The optimum concentration of GHS to release DMP is in the millimolar range. These results had provided an important insight into the design of new MNPs for biomedicine applications, such as drug delivery and bio-separation.

Keywords:
Site-specific delivery; Surface chemistry; Nanoparticles; Biomaterials; Conjugation; Controlled release