What is Hexane? Hexane is a pollutant and neurotoxin also found in gasoline, Mother Jones reports, citing a recent study by the Cornucopia Institute. Some companies that make veggie burgers are submerging soybeans in hexane to separate the oil from the protein. It is done to reduce the fat in the product. It was noted in the study that the Hexane process is also used to make cooking oils and margarine. The food and agriculture nonprofit found that most non-organic veggie burgers currently on the market are made with the chemical hexane, an EPA-registered air pollutant and neurotoxin. Says Cornucopia Institute senior researcher Charlotte Vallaeys, “If a non-organic product contains a soy protein isolate, soy protein concentrate, or texturized vegetable protein, you can be pretty sure it was made using soy beans that were made with hexane.”

These veggie burgers are made with hexane:

Amy’s Kitchen
Boca Burger (conventional)
Franklin Farms
Garden Burger
It’s All Good Lightlife
Morningstar Farms
President’s Choice
Taste Above
Trader Joe’s
Yves Veggie Cuisin

While these veggie burgers are hexane-free:

Boca Burgers “made with organic soy”
Helen’s Kitchen
Morningstar “made with organic”
Superburgers by Turtle Island
Tofurky
Wildwood

sources:
You can read the report at http://cornucopia.org/soysurvey/OrganicSoyReport/behindthebean_color_final.pdf
more information can be found at www.motherjones.com