In addition, the E.E. of PEG-Fe3O4 was inferior to CTS-Fe3O4 notably for the lack of electrostatic attraction. Figure 1 The size and zeta potential of the CTS-Fe3O4. (a) Size of distribution of the CTS-Fe3O4; (b) zeta potential of the CTS-Fe3O4. 3.2. Target Distribution In Vivo The different organs from the mice injected with polymer-Fe3O4 were taken out and made into tissue slices. Target distribution of polymer Fe3O4 in vivo was demonstrated with the help of outer static magnetic Inhibitors,research,lifescience,medical field. Figure 2(b) shows a large number of iron particles scattered in the hepatic tissue; many

of them were distributed along the hepatic sinusoid 2h after injection. The iron particles decreased gradually over time and disappeared 24h after injection (data not shown). The shape of the liver Inhibitors,research,lifescience,medical cells was seen under a high-power microscope to be integrated. There was no iron staining in the other organs, such as the lungs (Figure 2(d)), the spleen, and the heart. And there was no obvious side effect observed in the injected mice. Figure 2 Target distribution of magnetic CTS-Fe3O4 in liver and lung tissue. Figures were shown by Prussian blue and neutral red staining Inhibitors,research,lifescience,medical (×250), with outer static magnetic field for 2 hours. (a) Normal liver tissue; (b) liver tissue injected CTS-Fe3O … 3.3. Test of Polymer-Fe3O4-Loaded

DNA In Vitro Protection of DNA from DNaseI degradation was detected by 1% agarose gel electrophoresis. Naked pEGFP-C1 without Inhibitors,research,lifescience,medical digestion and naked pEGFP-C1 following digestion by DNaseI were used as controls. We could evidence partial protection of DNA coated by polymer Fe3O4 from nuclease-mediated DNA degradation (unpublished data). It was assumed that DNA degradation occurs in several layers; external Inhibitors,research,lifescience,medical layers will be degraded easily but not internal layers. Furthermore, CTS-Fe3O4 nanoparticles offered higher protection for DNA than PEG-Fe3O4, as the DNA chains could be Selleck Vemurafenib attached more strongly to the former. In addition, DNaseI digestion resulted in a shift

in the most distribution of the DNA isoforms: supercoiled plasmid in nontreated samples was replaced by the open loop form in treated samples. The in vitro release rates of DNA from polymer-Fe3O4 complexes were studied at different volume ratios. A significant proportion (30%) of the adsorbed DNA was released very rapidly from the CTS-Fe3O4 nanoparticles in the initial 12 hours. After TCL 48h, the amount of released DNA reached 55% at the optimal E.E. And the remainder of the adsorbed DNA was released slowly, reaching 70% at 96h (Figure 3(a)). Compared to DNA release from CTS-Fe3O4, a burst release phase of more than 61% from PEG-Fe3O4 was observed. The release curve showed that the DNA was released more rapidly; more than 80% of DNA was discharged from PEG-Fe3O4 after 24h at the optimal E.E., and the entire release was mostly completed at 72h (Figure 3(b)).