Under optimal conditions, Kana can be detected selectively in a linear range from 0.05 to 0.6 μg mL−1 with a detection limit of 2.6 ng mL−1 (4.6 nM, S/N = 3) in milk, which is below the allowed maximum residue limit (MRL) in food products (for example, 300 nM in milk and 200 nM in meat as set by the European Medicines uation Agency) [25] and [26].