Alligator Fat Could Fill Your Gas Tank and Fuel Renewable Resource Investment in the South

Every year, about 15 million pounds of alligator fat is dumped into landfills as a byproduct of alligator meat processing. It would certainly be better to reuse this gloopy mess for a greater purpose, no? As it turns out, alligator fat is a prime candidate for animal-derived biodiesel, according to researchers in Louisiana.
Food waste is a good alternative, and we’ve seen plenty of projects that use restaurant frying oil repurposed as biodiesel, for instance. But this does not come close to meeting the nation’s diesel needs — in 2008 alone, Americans consumed 45 billion gallons of diesel, according to the authors of this alligator study. Rendered animal fat could supplement food waste, but some animal fats are not very suitable for biofuel production.
Researchers at the University of Louisiana set about trying to determine if alligators could be a better source. Srividya Ayalasomayajula, Ramalingam Subramaniam and their colleagues knew alligator fat has a high lipid content, which could make it a strong biodiesel candidate. To test this hypothesis, the scientists obtained some frozen alligator samples from meat producers, and microwaved it to render the fat. They also used a chemical solvent.

       Microwaving it resulted in a 61 percent recovery by weight, the researchers found. Just to be sure, they went ahead and refined some biodiesel, and found the oil’s fatty acid profile meets all the requirements for high-quality biodiesel — it has a little excess calcium and magnesium, but an improved refining process can dispense with that. Check out their paper for the full rundown.