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Corn kernels are the
fruits of
corn (called maize in many countries). Maize is a
grain, and the kernels are used in cooking as a
vegetable
Vegetables are parts of plants that are consumed by humans or other animals as food. The original meaning is still commonly used and is applied to plants collectively to refer to all edible plant matter, including the flowers, fruits, stems, ...
or a source of
starch. The kernel comprise
endosperm,
germ
Germ or germs may refer to:
Science
* Germ (microorganism), an informal word for a pathogen
* Germ cell, cell that gives rise to the gametes of an organism that reproduces sexually
* Germ layer, a primary layer of cells that forms during embryo ...
,
pericarp
Fruit anatomy is the plant anatomy of the internal structure of fruit. Fruits are the mature ovary or ovaries of one or more flowers. They are found in three main anatomical categories: aggregate fruits, multiple fruits, and simple fruits. Aggr ...
, and tip cap.
One ear of corn contains roughly 800 kernels in 16 rows. Corn kernels are readily available in bulk throughout maize-producing areas. They have a number of uses, including
food and
biofuel. Corn consists of the husk and the silk, often mistaken for the husk.
Description
![CSIRO ScienceImage 3195 Maize or corn](https://upload.wikimedia.org/wikipedia/commons/5/51/CSIRO_ScienceImage_3195_Maize_or_corn.jpg)
Corn kernels are the
fruits of
maize
Maize ( ; ''Zea mays'' subsp. ''mays'', from es, maíz after tnq, mahiz), also known as corn (North American and Australian English), is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. The ...
. Maize is a
grain, and the kernels are used in cooking as a
vegetable
Vegetables are parts of plants that are consumed by humans or other animals as food. The original meaning is still commonly used and is applied to plants collectively to refer to all edible plant matter, including the flowers, fruits, stems, ...
or a source of
starch. The kernels can be of various colors: blackish,
bluish-gray
''Glaucous'' (, ) is used to describe the pale grey or bluish-green appearance of the surfaces of some plants, as well as in the names of birds, such as the glaucous gull (''Larus hyperboreus''), glaucous-winged gull (''Larus glaucescens''), gl ...
, purple, green, red, white and yellow. One ear of corn contains roughly 800 kernels in 16 rows. One hundred bushels of corn can contain upwards of 7,280,000 kernels. Transportation and packaging of dried clean corn kernels to non-producing areas adds to the cost.
Parts
The kernel of maize consists of a
pericarp
Fruit anatomy is the plant anatomy of the internal structure of fruit. Fruits are the mature ovary or ovaries of one or more flowers. They are found in three main anatomical categories: aggregate fruits, multiple fruits, and simple fruits. Aggr ...
(fruit wall) fused to the seed coat. This type of fruit is typical of the
grasses
Poaceae () or Gramineae () is a large and nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns ...
and is called a
caryopsis
In botany, a caryopsis (plural caryopses) is a type of simple fruit—one that is monocarpellate (formed from a single carpel) and indehiscent (not opening at maturity) and resembles an achene, except that in a caryopsis the pericarp is fuse ...
. Maize kernels are frequently and incorrectly referred to as
seed
A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiospe ...
s. The kernels are about the size of
pea
The pea is most commonly the small spherical seed or the seed-pod of the flowering plant species ''Pisum sativum''. Each pod contains several peas, which can be green or yellow. Botanically, pea pods are fruit, since they contain seeds and d ...
s, and adhere in regular rows round a white, pithy substance, which forms the ear.
Endosperm
About 82 percent of the corn kernel’s dry weight consists of
endosperm.
Starch is the primary source and it most widely used part of the kernel. It is known as the key component in fuel, sweeteners,
bioplastics
Bioplastics are plastic materials produced from renewable biomass sources, such as vegetable fats and oils, corn starch, straw, woodchips, sawdust, recycled food waste, etc. Some bioplastics are obtained by processing directly from natural ...
and other products.
Germ
The germ is the only living part of the corn kernel, also called its embryo. It consists of the important genetic information, vitamins,
enzymes and minerals for the plant to grow. The germ accounts for 25 percent of the
corn oils and it is a valuable part of the kernel.
Pericarp
The
pericarp
Fruit anatomy is the plant anatomy of the internal structure of fruit. Fruits are the mature ovary or ovaries of one or more flowers. They are found in three main anatomical categories: aggregate fruits, multiple fruits, and simple fruits. Aggr ...
is the outer covering that protects the kernel and helps to maintain the kernel's nutrient value and moisture content. It is about 91% fiber. If the kernels are wet-milled, most of the pericarp will end up in the
corn gluten feed
Maize ( ; ''Zea mays'' subsp. ''mays'', from es, maíz after tnq, mahiz), also known as corn (North American and Australian English), is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. Th ...
.
Tip cap
The tip cap is the attachment point of the kernel to the
corn cob
A corncob, also called corn cob, cob of corn or corn on the cob, is the central core of an ear of corn (also known as maize). It is the part of the ear on which the kernels grow. The ear is also considered a "cob" or "pole" but it is not full ...
, where the nutrient and water flow, and this is the only part that not covered by the pericarp. It contains fiber.
Use
Corn kernels have a number of uses, including food,
biofuel, and
bioplastics
Bioplastics are plastic materials produced from renewable biomass sources, such as vegetable fats and oils, corn starch, straw, woodchips, sawdust, recycled food waste, etc. Some bioplastics are obtained by processing directly from natural ...
.
Food
Corn is a popular food throughout the world in many forms. It is used in breakfast cereals in the
Western world
The Western world, also known as the West, primarily refers to the various nations and states in the regions of Europe, North America, and Oceania. (as
corn flakes
Corn flakes, or cornflakes, are a breakfast cereal made from toasting flakes of corn (maize). The cereal, originally made with wheat, was created by Will Kellogg in 1894 for patients at the Battle Creek Sanitarium where he worked with his bro ...
) and it is a grain that can be eaten raw off the cob, although it is usually preferred cooked. It may be fed to animals or humans. In
the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
, for economic reasons such as government subsidies, corn is the basis of many products, in the form of
high fructose corn syrup
High-fructose corn syrup (HFCS), also known as glucose–fructose, isoglucose and glucose–fructose syrup, is a sweetener made from corn starch. As in the production of conventional corn syrup, the starch is broken down into glucose by enzy ...
, in favor of cane sugar. A
gene
In biology, the word gene (from , ; "... Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a b ...
tic variant that accumulates more sugar and less
starch in the ear is consumed as a vegetable and is called
sweet corn.
When ground into
flour, maize yields more flour, with much less
bran
Bran, also known as miller's bran, is the hard outer layers of cereal grain. It consists of the combined aleurone and pericarp. Corn (maize) bran also includes the pedicel (tip cap). Along with germ, it is an integral part of whole grains, ...
, than wheat does. It lacks the protein
gluten
Gluten is a structural protein naturally found in certain cereal grains. Although "gluten" often only refers to wheat proteins, in medical literature it refers to the combination of prolamin and glutelin proteins naturally occurring in all grai ...
of wheat and, therefore, makes baked goods with poor rising capability.
It is also used in
popcorn, a common snack in the US.
Biofuel
Corn kernels are used as
pelletized fuel for
pellet stove
A pellet stove is a stove that burns compressed wood or biomass pellets to create a source of heat for residential and sometimes industrial spaces. By steadily feeding fuel from a storage container (hopper) into a burn pot area, it produces a con ...
s and furnaces. Corn kernels are a natural pellet, which gives them an economic advantage over other man-made
biomass pellets and
wood pellets
Pellet fuels (or pellets) are biofuels made from compressed organic matter or biomass. Pellets can be made from any one of five general categories of biomass: industrial waste and co-products, food waste, agricultural residues, energy crops, and ...
.
The use of corn and other grains as a
renewable biofuel may have environmental and cost benefits, compared to other energy sources, and may create additional forms of revenue for farmers and other economic industries. However, the use of corn as a fuel stock may increase the price of corn and have adverse effects on corn as a food stock. In the United States, 5.6 million bushels of corn were used for
ethanol
Ethanol (abbr. EtOH; also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound. It is an alcohol with the chemical formula . Its formula can be also written as or (an ethyl group linked to a ...
production out of 14.6 million bushels produced, according to preliminary 2018
USDA
The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of com ...
data. According to the U.S. Department of Energy's Alternative Fuels Data Center, "The increased ethanol
roductionseems to have come from the increase in overall corn production and a small decrease in corn used for animal feed and other residual uses. The amount of corn used for other uses, including human consumption, has stayed fairly consistent from year to year."
This does not prove there was not an impact on food supplies: Since U.S. corn production doubled (approximately) between 1987 and 2018, it is probable that some cropland previously used to grow other food crops is now used to grow corn. It is also possible or probable that some marginal land has been converted or returned to agricultural use. That may have negative environmental impacts. Part of the production increase is also due to higher yields.
Achieving higher yields may entail greater use of irrigation, fertilizers, and controversial herbicides.
See also
*
Biofuel
*
Corn wet-milling
Corn wet-milling is a process of breaking corn kernels into their component parts: corn oil, protein, corn starch, and fiber. It uses water and a series of steps to separate the parts to be used for various products.
History
The corn wet-millin ...
References
{{corn
Maize