Issue 34, 2023

Mn(ii) complex impregnated porous silica nanoparticles as Zn(ii)-responsive “Smart” MRI contrast agent for pancreas imaging

Abstract

Type-1 and type-2 diabetes mellitus are metabolic disorders governed by the functional efficiency of pancreatic β-cells. The activities of the cells toward insulin production, storage, and secretion are accompanied by Zn(II) ions. Thus, for non-invasive pathology of the cell, developing Zn(II) ion-responsive MRI-contrast agents has earned considerable interest. In this report, we have synthesized a seven-coordinate, mono(aquated) Mn(II) complex (1), which is impregnated within a porous silica nanosphere of size 13.2 nm to engender the Mn(II)-based MRI contrast agent, complex 1@SiO2NP. The surface functionalization of the nanosphere by the Py2Pic organic moiety for the selective binding of Zn(II)-ions yields complex 1@SiO2-Py2PicNP, which exhibits r1 = 13.19 mM−1 s−1. The relaxivity value elevates to 20.38 mM−1 s−1 in the presence of 0.6 mM BSA protein at pH 7.4. Gratifyingly, r1 increases linearly with the increase of Zn(II) ion concentration and reaches 39.01 mM−1 s−1 in the presence of a 40 fold excess of the ions. Thus, Zn(II)-responsive contrast enhancement in vivo is envisaged by employing the nanoparticle. Indeed, a contrast enhancement in the pancreas is observed when complex 1@SiO2-Py2PicNP and a glucose stimulus are administered in fasted healthy C57BL/6 mice at 7 T.

Graphical abstract: Mn(ii) complex impregnated porous silica nanoparticles as Zn(ii)-responsive “Smart” MRI contrast agent for pancreas imaging

  • This article is part of the themed collection: #MyFirstJMCB

Supplementary files

Article information

Article type
Paper
Submitted
05 jun. 2023
Accepted
31 jul. 2023
First published
31 jul. 2023

J. Mater. Chem. B, 2023,11, 8251-8261

Mn(II) complex impregnated porous silica nanoparticles as Zn(II)-responsive “Smart” MRI contrast agent for pancreas imaging

R. Mallik, M. Saha, V. Singh, H. Mohan, S. S. Kumaran and C. Mukherjee, J. Mater. Chem. B, 2023, 11, 8251 DOI: 10.1039/D3TB01289A

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