Journal
DALTON TRANSACTIONS
Volume 40, Issue 18, Pages 5018-5025Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10033e
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Funding
- National Science Council of Taiwan [NSC 98-2627-M-009-009, NSC 97-2113-M-009-016-MY3]
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In this study, we have developed two new L-tryptophan based contrast agents [Gd(Try-TTDA)(H2O)](2-) and [Gd(Try-ac-DOTA)(H2O)](-). Upon addition of Cu(II) to [Gd(Try-TTDA)(H2O)](2-), significant increases in the relaxivity (r(1)) and hydration number of [Gd(Try-TTDA)(H2O)](2-) were observed. However, it only induced a minute increase in the relaxivity (r(1)) in the case of [Gd(Try-ac-DOTA)(H2O)](-). Furthermore, the interaction of Cu(II) with the indole ring of Gd(III) complexes was explored by measuring the intrinsic fluorescence of the tryptophan of the Gd(III) complex. With the addition of one equivalent of Cu(II) to [Gd(Try-TTDA)(H2O)](2) the indole fluorescence was completely quenched. Moreover, the [Gd(Try-TTDA)(H2O)](2-) complex shows excellent selectivity towards Cu(II) over other metal ions (Cu(II) > La(III) > Mg(II)). Importantly, the significant signal intensity (2073 +/- 67) for in vitro MR imaging using [Gd(Try-TTDA)(H2O)](2-) in the presence of Cu(II) implicates that this new smart contrast agent ([Gd(Try-TTDA)(H2O)](2-)) can serve as a Cu(II) sensor for MR imaging.
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