Detection of quinolone antibiotics with electrochemiluminescence of bimetallic ruthenium complex [(bpy)2Ru(bpy)(CH2)8(bpy)Ru(bpy)2]4+

Electrochemiluminescence (ECL) of bimetallic ruthenium tris-bipyridyl complex [(bpy)₂Ru(bpy)(CH₂)₈(bpy)Ru(bpy)₂]⁴⁺ has been employed for the determination of ofloxacin (OFLX), levofloxacin (LVFX), norfloxacin (NFLX) and ciprofloxacin (CPFX) in milk samples with good reproducibility and stability.