Ferrous sulfate, or iron comes from the United States- the only ingredient in the enrichment blend that comes from the United States. At the steel mills, iron ore is baked into steel and squeezed into long sheets up to 1,400 feet long, and rinsed with sulfuric acid to remove the crusty oxide scales that automatically form on the new steel. After several sheets of steel have been through the sulfuric acid, it becomes saturated with iron and is pumped out to be separated. Iron sulfate crystals drop to the bottom of the tank and the sulfuric acid is poured off to be reused later. The crystals are ground into a fine dust and used to enrich Twinkies or in a number of other ways such as fabric dyes, inks, water purification, or weed killer. When cheaper, the food companies will use reduced iron instead of ferrous sulfate. Reduced iron is made when iron has reacted with carbon monoxide and/or hydrogen to get ferric oxide (better known as rust) which is ground to an ultra fine powder and used as ferrous sulfate. This product is less expensive and not as strong as ferrous sulfate and comes from India or China.
Niacin (B3) is made in Switzerland from 3 basic materials: water, air, and petroleum. The petroleum is processed under extreme heat and pressure into methane, ethylene, and hydrogen (among a multitude of other things). Air is liquefied and distilled to separate the nitrogen from the oxygen and the nitrogen is mixed with the hydrogen under high heat and pressure to make ammonia. The ammonia is mixed with oxygen to make nitric acid. Ethylene and Acetylene are mixed under pressure with water and a rare platinum catalyst to make acetaldehyde, a flammable liquid which is processed and mixed with ammonia. The ammonia/acetaldehyde blend is mixed with some of the nitric acid and niacin is the result.
Thiamine Mononitrate (B1) was the first vitamin to be discovered in the late 1800's by Dutch scientist Christiaan Eiijkman. There are a variety of ways that the vitamin is made and each company closely guards their secret. In most cases, thiamine mononitrate is made with coal tar (yum!) that may (depending on the company) be treated with hydrogen peroxide, active carbon, ammonium nitrate, nitric acid, and washing alcohol. Believe it or not, they say it is edible at this point, but they do let it dry into crystals and turn it into a fine powder before mixing it with our flour. Some overachieving companies further react it with methanol, hydrochloric acid, and ethanol to make thiamine hydrochloride, another version of the vitamin found in manufactured foods.
Riboflavin (B2) is my personal favorite. Often yeast or bacteria is fermented, with candida yeast being a commonly used variety. Makers of monistat must be proud. Ashbya gossypii fungus and bacillus subtilis, or spent beer grain recycled from beer companies can also be used. The vitamin is taken out of the fermentation broth by many complex processes including: concentration, purification, crystallization, drying and milling. Once created riboflavin is a deep orange color which is used as a natural yellow food coloring. People who eat excessive amounts of riboflavin will have a bright yellow urine. Riboflavin is necessary to allow us to grow and convert food into energy. Insufficient amounts of riboflavin also lead to cracks and sores around the mouth and nose, light-sensitive eyes, and a sore tongue.
Folic acid was naturally discovered by the British. Never having been known for their great culinary skills, English and Australian people often use marmite on their toast. Marmite is a dark, yeast based substance similar to jelly that tastes (I've heard) like a salty, bitter, awful form of molasses. In the 1930's Dr. Lucy Wills discovered that a certain kind of anemia could be cured with marmite. Folic acid is the manufactured version of B9 or folate, and is better absorbed by the body when in the synthetic form. This vitamin was added to the enrichment blend in 1993. Though discovered in England, folic acid is made in China using both fermented and petroleum products. The fermentation is done in cane molasses, tapioca starch, or cornstarch. The rest is made with glutamic acid (the one that makes MSG when mixed with sodium), a form of acetone (found in nail polish remover), pteroic acid, benzoic acid, paraffin and butyric acid (butyric acid is also used in the Twinkie artificial butter flavoring). This mix is refined, reduced in acidity, purified with zinc and magnesium salts, crystallized, dried, and sterilized until only a fine dark powder is left over.
All of these ingredients get mixed together and added to all of our flours by law. With Twinkies, we get to add many more products as well including everyone's favorite, sugar, which we'll talk about next time.