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To prepare the grounds for analysis, the team first dried them in an oven. They mixed the resulting powder with a combination of solvents that caused the oil to separate from the solution. They extracted the oil, saving the solvents for than these other sources because of its high antioxidant content, found the study, which appeared in December in the American Chemical Society's Journal of Agricultural and Food Chemistry.
Around the world, growers produce more than 16 billion year, according to the U.S. Department of Agriculture. The scientists estimate that spent grounds could add 340 million gallons of biodiesel to the global fuel supply.the next round of processing. The remains could still be used as compost, ethanol feedstock, and fuel pellets."We're not wasting anything," Mohaptra told Discovery News. "It's a recycling process." The study showed that used grounds contain about 15 percent oil by weight, depending on the type of coffee. That's not too far off the proportions in soybean, rapeseed, and palm oils, which are also used as sources for biodiesel. oil is more stable