Opposing Digits

Soybean lecithin comes from sludge left after crude soy oil goes through a “degumming” process. It is a waste product containing solvents and pesticides and has a consistency ranging from a gummy fluid to a plastic solid. Before being bleached to a more appealing light yellow, the color of lecithin ranges from a dirty tan to reddish brown. The hexane extraction process commonly used in soybean oil manufacture today yields less lecithin than the older ethanol-benzol process, but produces a more marketable lecithin with better color, reduced odor and less bitter flavor.7

Historian William Shurtleff reports that the expansion of the soybean crushing and soy oil refining industries in Europe after 1908 led to a problem disposing the increasing amounts of fermenting, foul-smelling sludge. German companies then decided to vacuum dry the sludge, patent the process and sell it as “soybean lecithin.” Scientists hired to find some use for the substance cooked up more than a thousand new uses by 1939.8

Today lecithin is ubiquitous in the processed food supply. It is most commonly used as an emulsifier to keep water and fats from separating in foods such as margarine, peanut butter, chocolate candies, ice cream, coffee creamers and infant formulas. Lecithin also helps prevent product spoilage, extending shelf life in the marketplace. In industry kitchens, it is used to improve mixing, speed crystallization, prevent “weeping,” and stop spattering, lumping and sticking. Used in cosmetics, lecithin softens the skin and helps other ingredients penetrate the skin barrier. A more water-loving version known as “deoiled lecithin” reduces the time required to shut down and clean the extruders used in the manufacture of textured vegetable protein and other soy products.9,10

In theory, lecithin manufacture eliminates all soy proteins, making it hypoallergenic. In reality, minute amounts of soy protein always remain in lecithin as well as in soy oil. Three components of soy protein have been identified in soy lecithin, including the Kunitz trypsin inhibitor, which has a track record of triggering severe allergic reactions even in the most minuscule quantities. The presence of lecithin in so many food and cosmetic products poses a special danger for people with soy allergies.11-13

# posted by madthumbs @ 6:55 PM