Betaines - domestic (internal) salts chetvertichnyh ammonievyh the bases (sometimes these include internal salt of Quaternary oxonium and Solonevich grounds). Derive some amino acids, nitrogen fully methylated. Betaines widely represented in the plant world, and invertebrates. In the body of the higher animals. Ways of formation of betaines in the body is not yet known. The simplest representative of betaines is glycinebetaine, also called simply a betaine, C5H11O2N, first isolated from the juice of beetroot (Beta vulgaris). Also found in invertebrates, urine and various mammalian tissues. Methionine is the donor of methyl groups. Hydrochloric glycinebetaine is used in medicine as a substitute of hydrochloric acid. Carnitine (C7H15O3N) detected in animals. Guess he transfers of acetyl groups. Other representatives of betaines less studied.