Las bacterias generan la desintegración de las proteínas, ocasionando la liberación de aminoácidos azufrados como la cisteína y metionina; que originan la producción de metilmercaptano. Este compuesto orgánico también es conocido como metanotiol, y es un gas incoloro con un olor similar a la col y huevos podridos.
Es una sustancia natural hallada en muchos medios orgánicos, en la sangre, el cerebro, tejidos vegetales, entre otros. Es el responsable del mal aliento, el olor de flatulencias y olor de los pies.
Por tal razón, es empleado para proporcionar el olor particular del gas doméstico. Como el butano es un gas inodoro, en su preparación se le agrega mercaptano que le concede un olor desagradable, para así lograr ser detectado en caso de que exista una fuga, ya que es altamente volátil y puede generar una explosión.
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