Only the starches and sugars from corn's seed, or kernels, are used to make corn ethanol. After they ferment in water and enzymes, the liquor is distilled to produce ethanol. Cellulosic ethanol draws from an entire plant, which may be corn, sugar cane or other local crop. The majority of American ethanol is corn ethanol, which uses only the corn kernels.
Read more: What Part of the Corn Plant is Used to Make Ethanol? | eHow.com
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