Loading...

Modified Gadonanotubes as a promising novel MRI contrasting agent

Jahanbakhsh, R ; Sharif University of Technology | 2013

1048 Viewed
  1. Type of Document: Article
  2. DOI: 10.1186/2008-2231-21-53
  3. Publisher: 2013
  4. Abstract:
  5. Background and purpose of the study. Carbon nanotubes (CNTs) are emerging drug and imaging carrier systems which show significant versatility. One of the extraordinary characteristics of CNTs as Magnetic Resonance Imaging (MRI) contrasting agent is the extremely large proton relaxivities when loaded with gadolinium ion (Gdn 3+) clusters. Methods. In this study equated Gdn 3+ clusters were loaded in the sidewall defects of oxidized multiwalled (MW) CNTs. The amount of loaded gadolinium ion into the MWCNTs was quantified by inductively coupled plasma (ICP) method. To improve water solubility and biocompatibility of the system, the complexes were functionalized using diamine-terminated oligomeric poly (ethylene glycol) via a thermal reaction method. Results: Gdn 3+ loaded PEGylated oxidized CNTs (Gdn 3+@CNTs-PEG) is freely soluble in water and stable in phosphate buffer saline having particle size of about 200 nm. Transmission electron microscopy (TEM) images clearly showed formation of PEGylated CNTs. MRI analysis showed that the prepared solution represents 10% more signal intensity even in half concentration of Gd3+ in comparison with commerciality available contrasting agent Magnevist®. In addition hydrophilic layer of PEG at the surface of CNTs could prepare stealth nanoparticles to escape RES. Conclusion: It was shown that Gdn 3+@CNTs-PEG was capable to accumulate in tumors through enhanced permeability and retention effect. Moreover this system has a potential for early detection of diseases or tumors at the initial stages
  6. Keywords:
  7. Carbon nanotubes ; Contrast agent ; Functionalization ; Gadolinium ; MRI ; Pegylation ; Gadolinium pentetate meglumine ; Macrogol ; Multi walled nanotube ; Nuclear magnetic resonance imaging agent ; Phosphate ; Biocompatibility ; Comparative study ; Contrast enhancement ; controlled study ; Infrared spectroscopy ; Mass spectrometry ; Nuclear magnetic resonance imaging ; Nuclear magnetic resonance scanner ; Particle size ; Solubility ; Solubilization ; Transmission electron microscopy
  8. Source: DARU, Journal of Pharmaceutical Sciences ; Volume 21, Issue 1 , 2013 ; 15608115 (ISSN)
  9. URL: http://www.darujps.com/content/21/1/53