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3-Pyridylacetic acid

3-Pyridylacetic acid is a breakdown product of nicotine (and other tobacco alkaloids) and is part of the nicotine degradation pathway. It is formed from 4-(3-pyridyl)-butanoate. One alkaloid in particular, myosmine, appears to be a major source for 3-pyridylacetic acid. The alkaloid myosmine is present not only in tobacco products but also in various foods. Myosmine is easily nitrosated, yielding 4-hydroxy-1-(3-pyridyl)-1-butanone (HPB) and the esophageal tobacco carcinogen N'-nitrosonornicotine. The two major metabolites of myosmine metabolism have been identified as 3-pyridylacetic acid (20-26%) and 4-oxo-4-(3-pyridyl)butyric acid (50-60%) (PMID:16079272). 3-pyridylacetatic acid is an analog of nicotinic acid. (PMID 13898750).