Figure 2. Top: Concentration-dependence of the ECL signal of three amino acids. The background (only Ru(II)) is quite low. Bottom: ECL intensity of proline (and Ru(bpy)32+) at low concentrations

From

Short Communication: Electrochemiluminescence on the Basis of tris(bipyridyl)ruthenium(II) – Further Analytical Experiments

A. Habekost

World Journal of Chemical Education. 2016, 4(3), 64-66 doi:10.12691/wjce-4-3-3