Ytterbium-substituted transferrin and lactoferrin for near-infrared luminescent pH indicationElectronic supplementary information (ESI) available: Luminescence and circular dichroism spectra of apo-transferrin upon YbCl3 complexation. See DOI: 10.1039/c2nj40201g

The Yb 3+ -substituted transferrin and lactoferrin exhibited pH-dependent near-infrared emissions, and worked as luminescent pH indicators under neutral and weakly basic conditions. The Yb 3+ -substituted transferrin and lactoferrin exhibited pH-dependent near-infrared emissions, and worked as luminescent pH indicators under neutral and weakly basic conditions.