Corn starch

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Corn starch
Cornstarch mixed with water.jpg
Corn starch powder
Food energy
(per 100  g serving)
381  kcal  (1595 kJ)
Nutritional value
(per 100  g serving)
Protein 0.3  g
Fat 0.1  g
Carbohydrate 91  g
Other informationdensity 0.54 g/ml [1]
Corn starch mixed in water Corn Starch mixture.jpg
Corn starch mixed in water

Cornflour, cornstarch, maize starch, or corn starch (American English) is the starch derived from corn (maize) grain. [2] The starch is obtained from the endosperm of the kernel. Corn starch is a common food ingredient, often used to thicken sauces or soups, and to make corn syrup and other sugars. [3] 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. [4] It has medical uses as well, such as to supply glucose for people with glycogen storage disease. [5]

Contents

Like many products in dust form, it can be hazardous in large quantities due to its flammability—see dust explosion. 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". [6]

History

Advertisement for a Cornflour manufacturer, 1894 Brown & Polson's.JPG
Advertisement for a Cornflour manufacturer, 1894

Until 1851, corn starch was used primarily for starching laundry and for other industrial uses.[ citation needed ] A method to produce pure culinary starch from maize was patented by John Polson of Brown & Polson, in Paisley, Scotland in 1854. [7] [8] This was sold as "Patented Corn Flour". Brown & Polson were muslin manufacturers who had been producing laundry starch for the Paisley shawl industry and would become the largest starch producers in the UK.

Uses

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.

Culinary

Advertisement by the US Food Administration, 1918, indicating corn starch as "wholesome" and "nutritious" United States Food Admininstration corn products poster.jpg
Advertisement by the US Food Administration, 1918, indicating corn starch as "wholesome" and "nutritious"

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 over 203 °F (95 °C), the molecular chains unravel, allowing them to collide with other starch chains to form a mesh, thickening the liquid (Starch gelatinization). However, continued boiling breaks up the molecules and thins the liquid. [9]

Cornstarch is usually included as an anticaking agent in powdered sugar (icing or confectioner's sugar).[ citation needed ]

A common substitute is arrowroot starch, which replaces the same amount of corn starch. [10]

Food producers reduce production costs by adding varying amounts of corn starch to foods, for example to cheese and yogurt. [11]

Chicken nuggets with a thin outer layer of corn starch allows increased oil absorption and crispness after the latter stages of frying. [12]

Non-culinary

Baby powder may include corn starch among its ingredients. [13] Corn starch can be used to manufacture bioplastics (like PLA used for 3D printing) [14] and may be used in the manufacture of airbags.[ citation needed ]

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.[ citation needed ]

Medical

Corn starch is the preferred anti-stick agent on medical products made from natural latex, including condoms, diaphragms, and medical gloves. [15] [16]

Corn starch has properties enabling supply of glucose to maintain blood sugar levels for people with glycogen storage disease. [17] Corn starch can be used starting at age 6–12 months allowing glucose fluctuations to be deterred. [18]

Manufacture

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. [19]

Risks

Like many other powders, corn starch is susceptible to dust explosions. It is believed that overheating of a corn starch-based powder—despite warnings on the packaging indicating that the material is flammable—initiated the Formosa Fun Coast explosion in Taiwan on 27 June 2015. [20]

Names and varieties

See also

Related Research Articles

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Dessert is a course that concludes a meal. The course consists of sweet foods, such as cake, and possibly a beverage such as dessert wine and liqueur. Some cultures sweeten foods that are more commonly savory to create desserts. In some parts of the world there is no tradition of a dessert course to conclude a meal.

<span class="mw-page-title-main">Hominy</span> Dried nixtamalized corn consumed as food

Hominy is a food produced from dried maize (corn) kernels that have been treated with an alkali, in a process called nixtamalization. "Lye hominy" is a type of hominy made with lye.

<span class="mw-page-title-main">Starch</span> Glucose polymer used as energy store in plants

Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants for energy storage. Worldwide, it is the most common carbohydrate in human diets, and is contained in large amounts in staple foods such as wheat, potatoes, maize (corn), rice, and cassava (manioc).

<span class="mw-page-title-main">Flour</span> Cereal grains ground into powder

Flour is a powder made by grinding raw grains, roots, beans, nuts, or seeds. Flours are used to make many different foods. Cereal flour, particularly wheat flour, is the main ingredient of bread, which is a staple food for many cultures. Corn flour has been important in Mesoamerican cuisine since ancient times and remains a staple in the Americas. Rye flour is a constituent of bread in both Central Europe and Northern Europe.

<span class="mw-page-title-main">Custard</span> Semi-solid cooked mixture of milk and egg

Custard is a variety of culinary preparations based on sweetened milk, cheese, or cream cooked with egg or egg yolk to thicken it, and sometimes also flour, corn starch, or gelatin. Depending on the recipe, custard may vary in consistency from a thin pouring sauce to the thick pastry cream used to fill éclairs. The most common custards are used in custard desserts or dessert sauces and typically include sugar and vanilla; however, savory custards are also found, e.g., in quiche.

<span class="mw-page-title-main">Corn syrup</span> Syrup made from corn used as food additive

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<span class="mw-page-title-main">Gravy</span> Sauce made from the juices of meats

Gravy is a topping or sauce often made from the juices of meats that run naturally during cooking and often thickened with corn starch or other thickeners for added texture. The gravy may be further coloured and flavoured with gravy salt or gravy browning or ready-made cubes. Powders can be used as a substitute for natural meat or vegetable extracts. Canned and instant gravies are also available. Gravy is commonly served with roasts, meatloaf, rice, noodles, chips (fries), mashed potatoes, or biscuits.

<span class="mw-page-title-main">Sweet corn</span> Variety of corn

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<span class="mw-page-title-main">Mazamorra</span> Beverage from Iberia or Hispanic America

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Arrowroot is a starch obtained from the rhizomes (rootstock) of several tropical plants, traditionally Maranta arundinacea, but also Florida arrowroot from Zamia integrifolia, and tapioca from cassava, which is often labeled arrowroot. Polynesian arrowroot or pia, and Japanese arrowroot, also called kudzu, are used in similar ways. In India, it is called palua.

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References

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  5. Gremse, D.A.; Bucuvalas, J. C.; Balistreri, W. F. (October 1990). "Efficacy of cornstarch therapy in type III glycogen-storage disease". The American Journal of Clinical Nutrition. 52 (4): 671–674. doi:10.1093/ajcn/52.4.671. ISSN   0002-9165. PMID   2403059.
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  8. Grace's Guide To British Industrial History - Brown and Polson
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