Amid growing concern that using soybeans and other food crops to produce biodiesel fuel will raise the price of food, scientists have identified a new and unlikely raw material for the fuel: Alligator fat.

Their report documenting gator fat's suitability for biofuel production appears in the latest episode in the American Chemical Society's (ACS) award-winning "Global Challenges/Chemistry Solutions" podcast series.

Rakesh Bajpai and colleagues note that most of the 700 million gallons of biodiesel produced in the United States (2008 data) came from soybean oil. The search for non-food sources of biodiesel already has identified a number of unlikely candidates, including spent oil from deep fryers in fast-food restaurants and sewage.

The scientists realized that alligator fat could join that list. Each year, the alligator meat industry disposes of about 15 million pounds of alligator fat in landfills. Bajpai is with the University of Louisiana at Lafayette.

They showed in laboratory experiments that oil extracted oil from alligator fat can easily be converted into biodiesel. The oil actually was more suitable for biodiesel production that oil from some other animal fats.

The gator biodiesel was similar in composition to biodiesel from soybeans, and met nearly all of the official standards for high quality biodiesel.

The new podcast is available without charge at iTunes