Xenon capsule: A smart 129Xe NMR-based sensor of Zn2+ ions for magnetic resonance imaging (MRI) is proposed. The resonance frequency of xenon encapsulated in a cryptophane that bears a nitrilotriacetic ligand moiety varies when Zn2+ ions are present in solution (see picture). With hyper-polarized gas, such a construct enables detection of 100 nM zinc in one xenon batch, a threshold 300 times lower than achieved with gadolinium chelates.
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Kotera et al. (2012) studied this question.
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