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A Study on the Concentration-Dependent Relaxometric Transition in Manganese Oxide Nanocolloid As Mri Contrast Agent Publisher



Khodaei A1 ; Malek M2 ; Hosseini HRM1 ; Delavari H H3 ; Vahdatkhah P1
Authors
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Authors Affiliations
  1. 1. Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, 14588–9694, Iran
  2. 2. Department of Radiology, Medical Imaging Center, Advanced Diagnostic and Interventional Radiology Research Center (ADIR), Tehran University of Medical Sciences, Imam Khomeini Hospital, Tehran, Iran
  3. 3. Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran

Source: ChemistrySelect Published:2019


Abstract

A green precipitation method has been used for the synthesis of ultra-small APTMS-mPEG conjugated Mn3O4 nanoparticles. Spherical cores in the uniform size of 4±1 nm were characterized by HRTEM. Zeta potential of −45 mV and the invariant turbidimetry results during the time, confirmed super-stability of the colloids. MRI relaxometry by 1.5 T scanner represented two values of r1= 8.23 s−1mM−1 and r1=7.3 s−1mM−1 for diluted and concentrated samples. The r2/r1 ratio was also decreased from 11.86 to 6.9 by dilution of colloids. Particle aggregation and motional narrowing phenomena led to a dual T1/T2 contrast agent in the Mn ion concentrations of more than 0.2 mM. The optimum concentration of Mn ion for maximum dual signal intensity was estimated about 0.4 mM which is two times less than commercial Gd–DTPA. Cytotoxicity was examined through MTT assay and respectively, showed high cell viability at 48 h incubation. Overall, a potential dual T1/T2 contrast agent was developed for early-stage detection. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim