Trimethylamine (Trimethylamine, abbreviated TMA), molecular formula N (CH3) 3, organic compounds, is also the simplest tertiary amine compounds. Trimethylamine is a colorless gas, heavier than air, hygroscopic, poisonous and flammable. The low concentration of trimethylamine gas has a strong fishy odor, with a high concentration of similar to the odor of ammonia. Trimethylamine is usually compressed into a cylinder or sold in a 40% aqueous solution. In natural conditions, the decomposition of plant and animal decay produces trimethylamine gas. The stench of rotten fish, the bad smell of infected wounds and bad breath are usually caused by trimethylamine. Most of the trimethylamine comes from choline and carnitine. Trimethylamine is a nitrogen-alkali, easy to obtain proton formation of trimethylamine cations. Trimethylamine hydrochloride is a hygroscopic white solid produced by the reaction of hydrochloric acid and trimethylamine.