Ractopamine is a beta-adrenergic agonist that stimulates the beta-2 receptor, leading to an increase in the release of fatty acids from adipocytes and glycerol from liver cells. The effect of ractopamine on the body weight and carcass composition can be measured by analyzing its concentration in blood plasma and urine after administration. Ractopamine is metabolized through hydrolysis into two metabolites: alpha-hydroxy-beta-methylpyridine carboxylic acid (AMPC) and pyridine carboxylic acid (PCA). These metabolites are excreted into the urine, which can then be quantified using analytical methods such as gas chromatography with an electrochemical detector.
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