The bread at Subway, said to be baked fresh, in-house each day, is made with a chemical that is also used to make yoga mats and rubber shoe soles. Well-known food blogger, Vani Hari says it is time to shine a light on the truth, and her work, along with 58,000 supporters, have forced a change: Subway has promised to remove the chemical called azodicarbonamide from its bread.
The principal use of azodicarbonamide is in the production of foamed plastics as an additive. The thermal decomposition of azodicarbonamide results in the evolution of nitrogen, carbon monoxide, carbon dioxide, and ammonia gases, which are trapped in the polymer as bubbles to form a foamed article. Azodicarbonamide as used in plastics, synthetic leather and other uses can be pure or modified. This is important because modification affects the reaction temperatures. Pure azodicarbonamide generally reacts around 200 ?C. In the plastic, leather and other industries, modified azodicarbonamide (average decomposition temperature 170 ?C) contains additives that accelerate the reaction or react at lower temperatures. Azodicarbonamide as a blowing agent in plastics has been banned in Europe since August 2005 for the manufacture of plastic articles that are intended to come into direct contact with food. Yummy.