Identification of metabolites of azaperone in horse urine.

The research article describes the identification of two new metabolites from a tranquilizer drug, azaperone, in horse urine. The extracted metabolites from horse urine are identified through independent chemical synthesis and spectral analysis.

Metabolites Extraction and Identification

• The researchers identified two metabolites of a tranquilizer drug called azaperone from horse urine. These metabolites were extracted after alkalinizing the urine and treating it with enzymes called beta-glucuronidase and sulfatase extracted from limpets, a type of marine snail.
• To identify these metabolites, the researchers performed independent chemical synthesis, a process by which chemical reactions are used to prepare the metabolites from simpler starting materials, followed by Gas Chromatography/Mass Spectrometry (GC/MS) and Hydrogen Nuclear Magnetic Resonance (1H NMR) analysis. These are powerful techniques used for the identification and analysis of chemical composition and structures.

Naming and Screening of Extracted Metabolites

• The identified metabolites were named as 5′-hydroxy-azaperol and 5′-hydroxyazaperone based on their structures. Both these metabolites were from the family of azaperone.
• The researchers developed a Thin Layer Chromatography (TLC) screening test to detect these metabolites in horse urine extracts. TLC is a type of chromatography used in molecular biology and biochemistry for separating and identifying compounds present in a sample.
• The screening test was then used to detect the presence of azaperone metabolites in horse urine extracts. This was done for samples collected over a period of 24 hours after the administration of azaperone to horses.

Confirmation of Azaperone Administration

• The presence of azaperone in horses was confirmed by a GC/MS identification technique of the above-mentioned metabolites from horse urine that was treated in a similar way as before.
• The extracted metabolites were treated with a reagent called bis(trimethylsilyl)acetamide to produce derivatives that were further tested, and the obtained mass spectra and retention times were compared with those of the synthesized metabolites that were treated in the same manner.

This study has important implications in the identification of tranquilizer drug usage in horses, by identifying their metabolites from urine samples, thereby aiding in better drug usage monitoring.