Hippuric acid
Hippuric Acid
Hippuric acid is an organic compound with the formula C_H_NO_. It is a benzoyl derivative of glycine and is found in the urine of herbivorous animals and humans. The name "hippuric" is derived from the Greek words "hippos" (horse) and "ouron" (urine), reflecting its presence in horse urine.
Structure and Properties
Hippuric acid is a white crystalline solid that is soluble in water and alcohol. It has a melting point of approximately 187 °C. The compound consists of a benzoyl group attached to the nitrogen of a glycine molecule. This structure is depicted in the adjacent image.
Biosynthesis
In the body, hippuric acid is synthesized in the liver by the conjugation of benzoic acid with glycine. This process is part of the body's mechanism for detoxifying benzoic acid, which can be derived from the metabolism of certain aromatic compounds or ingested directly from food preservatives.
Excretion
Hippuric acid is primarily excreted in the urine. The presence of hippuric acid in urine is often used as a biomarker for exposure to toluene, a common industrial solvent. Elevated levels of hippuric acid can indicate excessive exposure to toluene or other aromatic hydrocarbons.
Clinical Significance
The measurement of hippuric acid levels in urine can be used in occupational health to monitor workers' exposure to toluene. It is also used in toxicology to assess the body's ability to metabolize and excrete benzoic acid.
Related Compounds
Hippuric acid is related to other amino acid conjugates such as phenylacetylglutamine and indoxyl sulfate, which are also involved in the detoxification processes in the body.
Related Pages
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