Rh-odin's masterpiece: Coupling N-(rhodamine-6G)lactam-ethylenediamine to Fe3O4 nanoparticles through a polyethylene glycol chain renders the rhodamine unit more water soluble and useful for sensitive and selective detection of FeIII at the 2 ppb level in water. This sensitivity is also demonstrated in HeLa cells, thus indicating potential applications of this detection method in biological systems.
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Wang et al. (2010) studied this question.
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