Pyridine
An aromatic nitrogen heterocycle used as a secondary denaturant in Indian denatured spirit formulations (at 1-2% v/v). Its presence in a headspace GC-FID chromatogram of an illicit liquor sample is a forensic marker indicating that industrial denatured spirit was the methanol source, rather than a direct methanol addition.
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27 CFR Part 21Alcohol dehydrogenase (ADH)Anion-gap metabolic acidosisBitrex (denatonium benzoate)Completely Denatured Alcohol (CDA)Congener fingerprintingCountry liquor (India)EU Directive 92/83/EECFomepizole (4-methylpyrazole)Formate (formic acid)FSSAI methanol limitHaemodialysis in methanol poisoning