Poly(amidoamine) dendrimer based MRI contrast agents exhibiting enhanced relaxivities derived via metal preligation techniques.

Poly(amidoamine) dendrimer based MRI contrast agents exhibiting enhanced relaxivities derived via metal preligation techniques.
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DOI:
10.1021/bc1000802
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发表时间:
2010-06-16
影响因子:
4.7
通讯作者:
Brechbiel MW
Brechbiel MW
中科院分区:
化学2区
文献类型:
--
作者:
Nwe K;Bryant LH Jr;Brechbiel MW

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This report presents the preparation and characterization of three [Gd-C-DOTA]−1−dendrimer assemblies by way of analysis, NMRD spectroscopy, and photon correlation spectroscopy (PCS). The metal−ligand chelates were preformed in alcohol media prior to conjugation to generation 4, 5, and 6 PAMAM dendrimers. The dendrimer-based agents were purified by Sephadex G-25 column chromatography. The combustion analysis, SE-HPLC, and UV−vis data indicated chelate to dendrimer ratios of 28:1, 61:1 and 115:1, respectively. Molar relaxivity measured at pH 7.4, 22 °C, and 3 T (29.6, 49.8, and 89.1 mM−1s−1) indicated the viability of conjugates as MRI contrast agents. 1/T1NMRD profiles were measured at 23 °C and indicated that at 22 MHz the 1/T1reached a plateau at 60, 85, and 140 mM−1s−1for the generation 4, 5, and 6 dendrimer conjugates, respectively. The PCS data showed the respective sizes of 5.2, 6.5, and 7.8 nm for G-4, 5, and 6 conjugates.
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