1-Aminohydantoin

1-Aminohydantoin is a major metabolite of Nitrofurantoin (HY-A0090) in animal tissues and can be used as a standard for the determination of residues of veterinary agents in meat, milk et.al. 1-Aminohydantoin covalently binds to tissue proteins and is released from the tissues under slightly acidic conditions and derivatized with 2-nitrobenzaldehyde to form nitrophenyl derivatives of 1-Aminohydantoin before detection.