Maize/Corn Starch in Nairobi, Kenya
Corn starch, maize starch, or corn flour is the starch derived from corn (maize) grain. The starch is obtained from the endosperm of the kernel. It is a common food ingredient, often used to thicken sauces or soups, and to make corn syrup and other sugars. Corn starch is versatile, easily modified, and finds many uses in industry such as adhesives, in paper products, as an anti-sticking agent, and textile manufacturing. It has medical uses as well, such as to supply glucose for people with glycogen storage disease.
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Like many products in dust form, it can be hazardous in large quantities due to its flammability. When mixed with a fluid, corn starch can rearrange itself into a non-Newtonian fluid. For example, adding water transforms corn starch into a material commonly known as oobleck while adding oil transforms corn starch into an electrorheological (ER) fluid. The concept can be explained through the mixture termed “cornflour slime”.
Uses of corn starch
Although mostly used for cooking and as a household item, corn starch is used for many purposes in several industries, ranging from its use as a chemical additive for certain products, to medical therapy for certain illnesses.
Corn starch is used as a thickening agent in liquid-based foods (e.g., soup, sauces, gravies, custard), usually by mixing it with a lower-temperature liquid to form a paste or slurry. It is sometimes preferred over flour alone because it forms a translucent, rather than opaque mixture. As the starch is heated, the molecular chains unravel, allowing them to collide with other starch chains to form a mesh, thickening the liquid (Starch gelatinization). It is usually included as an anticaking agent in powdered sugar (icing or confectioner’s sugar).
A common substitute is arrowroot starch, which replaces the same amount of corn starch.
Food producers reduce production costs by adding varying amounts of corn starch to foods, for example to cheese and yogurt.
Chicken nuggets with a thin outer layer of corn starch allows increased oil absorption and crispness after the latter stages of frying.
Baby powder may include corn starch among its ingredients. Corn starch can be used to manufacture bioplastics and may be used in the manufacture of airbags.
Adhesive can be made from corn starch, traditionally one of the adhesives that may be used to make paste papers. It dries with a slight sheen compared to wheat starch. It may also be used as an adhesive in book and paper conservation.
Corn starch is the preferred anti-stick agent on medical products made from natural latex, including condoms, diaphragms, and medical gloves.
Corn starch has properties enabling supply of glucose to maintain blood sugar levels for people with glycogen storage disease. Corn starch can be used starting at age 6–12 months allowing glucose fluctuations to be deterred.
The corn is steeped for 30 to 48 hours, which ferments it slightly. The germ is separated from the endosperm and those two components are ground separately (still soaked). Next the starch is removed from each by washing. The starch is separated from the corn steep liquor, the cereal germ, the fibers and the corn gluten mostly in hydrocyclones and centrifuges, and then dried. (The residue from every stage is used in animal feed and to make corn oil or other applications.) This process is called wet milling. Finally, the starch may be modified for specific purposes.