Corn Facts
Corn, Zea mays L., (or “maize” at it is known throughout much of the world) is a cereal crop, a member of the grass family. Corn is grown around the world and is one of the globe's most widely used food staples; corn varieties are directly used for food and animal feed or processed to make food and feed ingredients (such as high fructose corn syrup, corn starch and lysine) or industrial products such as ethanol and polylactic acid (PLA). The two primary methods of processing corn are referred to as "dry" and "wet" milling.
Industry Overview
In 2005, the U.S. produced 42 percent of the world’s corn. Over 50 percent of the U.S. crop is produced in Iowa, Minnesota, Nebraska or Illinois. Other states in which corn is grown include Kentucky, Ohio, Indiana, Wisconsin, South Dakota, Wisconsin and Missouri. In 2005, over 58 percent of the U.S. corn crop was used for feed. The remaining U.S. crop was split between exports (25 percent) and food, seed or industrial uses such as ethanol production (17 percent).Other major corn producing countries include China, Brazil, Mexico and the 25 countries that make up the European Union.
Global Corn Production
(1000 metric tons)
Production 2003/2004 2004/2005
Argentina15,00019,500
Brazil42,00035,500
Canada9,6008,836
China115,830128,000
Egypt5,7405,780
India14,72013,600
Indonesia6,3506,500
Mexico21,80022,000
Nigeria5,5006,500
Philippines4,8455,100
Romania7,02012,000
Serbia and Montenegro3,8006,274
South Africa9,70012,000
Thailand4,1004,000
Turkey2,8003,000
Ukraine6,8508,800
EU-2539,86153,350
Others51,91755,606
United States256,278299,917
TOTAL623,711706,263
Much of the corn now grown around the world is genetically modified for herbicide and/or pest resistance.
Major Products
Corn oil, which is extracted from corn germ, has high polyunsaturated fatty acid content and oxidative stability. Its largest single use is in bottled oil for consumer use, followed by margarine and industrial snack-frying operations. By removing free fatty acids and phospholipids from crude corn oil, the oil refining process gives corn oil one of the qualities consumers value most: its excellent frying quality and resistance to smoking or discoloration. It also has a pleasant taste, resists developing off-flavors.In addition, refiners produce starches, sweeteners and ethanol -- all made from the starch portion of the corn.Corn starch, which is derived from the endosperm of the corn kernel, is a mainstay of the corn refining industry. It has a wide range of industrial and food applications. Over 90 percent of the starch Americans used is produced from corn.Corn sweeteners supply more than 56 percent of the U.S. nutritive sweetener market. Corn syrup is a sweetener made by processing corn starch with enzymes or acid to create a dextrose solution. High fructose corn syrup (HFCS) is further processed to increase its sweetness. Since HFCS is stable and cheaper to produce than ordinary sugar, it has largely replaced sugar in processed foods and soft drinks; in recent years, consumer watchdog and health groups have increasingly taken food manufacturers to task for their widespread use of HFCS, claiming that the product contributes to obesity.Ethanol is another major refined corn product; refined from the starch of the corn kernel, ethanol is an alcohol that has many industrial uses. In recent years, it has become an increasingly important source of fuel for internal combustion engines.
Common Processes Used
There are two basic methods employed in processing corn kernels. They are known as “dry milling” and “wet milling.”Dry milling is the process in which corn is separated into flour, corn meal, grits and other products by soaking corn kernels in water, then removing the germ for processing into oil. The remaining parts of the kernel are ground and sieved into various fractions.Wet milling is the process by which corn is separated into starch (syrup, ethanol, corn starch), germ (oil), and fiber and gluten (animal feed) by soaking corn kernels in water (and often sulfur dioxide) before separating them into the components above by grinding and centrifuge.
Leading Companies
Major processors of corn in the U.S. include A.E. Staley Manufacturing Company, Ag Processing Inc., Archer Daniels Midland Company, Bunge Ltd., Cargill, Inc., Corn Products International, Inc., National Starch and Chemical Company, Penford Company, Roquette America, Inc. and Tate & Lyle PLC.Other important U.S. processors include Consolidated Grain and Barge Company, SunOpta Grains and Foods Group, SK Food International Inc. and Agricor, Inc.
Further Resources
American Association of Cereal Chemists: Corn Growers Association: Refiners Association: Corn Growers Association: American Millers Association: www.nama.orgU.S. Grains Council: for this Corn Facts page was provided by the Corn Refiners Association.