Vinegar

Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5–8% acetic acid by volume.[1] Usually the acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria.[2] There are many types of vinegar, depending on source materials. Vinegar is now mainly used in the culinary arts: as a flavorful, acidic cooking ingredient, or in pickling.

A variety of flavored vinegars, for culinary use, on sale in France

As the most easily manufactured mild acid, it has historically had a wide variety of industrial and domestic uses (such as its use as a household cleaner).[1]

Etymology
Fast aerobic fermentation stainless steel vessels

The word vinegar arrived in Middle English from Old French (vyn egre; 'sour wine'), which in turn derives from Latin: vinum (wine) + acer (sour).[1][3]

Chemistry

The conversion of ethanol (CH3CH2OH) and oxygen (O2) to acetic acid (CH3COOH) takes place by the following reaction:[4]

CH3CH2OH + O2 → CH3COOH + H2O

Polyphenols

Vinegar contains numerous flavonoids, phenolic acids, and aldehydes,[5] which vary in content depending on the source material used to make the vinegar, such as orange peel or various fruit juice concentrates.[6][7]

History

While vinegar making may be as old as alcoholic brewing, the first documented evidence of vinegar making and use was by the Ancient Babylonians around 3000 BC.[8][9] They primarily made vinegar from dates, figs, and beer and used it for both culinary and medicinal purposes. Traces of it also have been found in Egyptian urns. In East Asia, the Chinese began professionalizing vinegar production in the Zhou Dynasty.[10] In the book Zhou Li, it mentions many noble or royal households had a “vinegar maker” as a specialized position. Most vinegar making then was concentrated in what is now Shanxi province near the city Taiyuan which remains a famous vinegar making region today. Many Chinese vinegars and their uses for culinary and medicinal purposes were written down in the agricultural manual Qimin Yaoshu (齊民要術).[10]

The Greeks and Romans frequently used vinegars made from wine. The Spartans had vinegar as a part of their traditional broth melas zomos. The Roman Columella described the ingredients and process for making several types of vinegars in his work Res Rustica.[10]

During the Middle Ages, much work was done by Islamic scholars such as Geber who first isolated acetic acid by distilling vinegar. Vinegar making was also slowly professionalized in Europe with the French city of Orléans becoming particularly famous for the quality of its vinegars through a formalized fermentation and aging process which became known as the Orléans process.[8][9][10] During this time malt vinegar also began to develop in England where it was first known as alegar.[11] Balsamic vinegar also began its evolution in the Duchy of Modena in Italy though it would not become widely known until the Napoleonic Wars after being sold abroad by French troops.[12]

In the 19th century, vinegar underwent many dramatic changes, such as rapid industrialization as well as scientific analysis. The first large-scale industrial process for vinegar production was invented by Karl Sebastian Schüzenbach in the Kingdom of Baden in 1823.[10] Known as the packed generator, it circulated alcohol over beechwood shavings to reduce fermentation times from several months down to 1–2 weeks. This process also facilitated the rise of vinegar made from pure alcohol called spirit vinegar or distilled white vinegar. Japan also began industrializing vinegar production during the last days of the Tokugawa Shogunate when Matazaemon Nakano, a man from a traditional sake brewing family, discovered sake lees could be used to make rice vinegar. This helped provide an ample supply of vinegar for the burgeoning popularity of sushi in Japan. The company he founded, now known as Mizkan, is headquartered in Kyoto and is the largest vinegar producer in the world.[10]

Likewise, vinegar fermentation became understood as a natural and biological process. Louis Pasteur made the decisive discovery that a special type of bacteria, later known as acetic acid bacteria, were the agents of fermentation for vinegar production.

In the 20th century, vinegar production again was revolutionized by the invention of the submerged fermentation process that cut production times down to 1–2 days. This allowed the massive production of cheap vinegar around the world.

Production
Main article: Acetic acid § Production

Commercial vinegar is produced either by a fast or a slow fermentation process. In general, slow methods are used in traditional vinegars, where fermentation proceeds over the course of a few months to a year. The longer fermentation period allows for the accumulation of a nontoxic slime composed of acetic acid bacteria.

Fast methods add mother of vinegar (bacterial culture) to the source liquid before adding air to oxygenate and promote the fastest fermentation. In fast production processes, vinegar may be produced in one to three days.

Varieties

The source materials for making vinegar are varied: different fruits, grains, alcoholic beverages, and other fermentable materials are used.[1]

Fruit
Raisin vinegar

Fruit vinegars are made from fruit wines, usually without any additional flavoring. Common flavors of fruit vinegar include apple, blackcurrant, raspberry, quince, and tomato. Typically, the flavors of the original fruits remain in the final product. Most fruit vinegars are produced in Europe, where there is a market for high-price vinegars made solely from specific fruits (as opposed to non-fruit vinegars that are infused with fruits or fruit flavors).[13] Several varieties are produced in Asia. Persimmon vinegar, called gam sikcho, is common in South Korea. Jujube vinegar, called zaocu or hongzaocu, and wolfberry vinegar are produced in China.

Persimmon vinegar produced in South Korea

Apple cider vinegar is made from cider or apple must, and has a brownish-gold color. It is sometimes sold unfiltered and unpasteurized with the mother of vinegar present. It can be diluted with fruit juice or water or sweetened (usually with honey) for consumption.

A byproduct of commercial kiwifruit growing is a large amount of waste in the form of misshapen or otherwise-rejected fruit (which may constitute up to 30 percent of the crop) and kiwifruit pomace. One of the uses for pomace is the production of kiwifruit vinegar, produced commercially in New Zealand since at least the early 1990s, and in China in 2008.[14][15]

Pomegranate vinegar is used widely in Israel as a dressing for salad, but also in meat stew and in dips.[16] Vinegar made from raisins is used in cuisines of the Middle East. It is cloudy and medium brown in color, with a mild flavor. Vinegar made from dates is a traditional product of the Middle East, and used in Saudi Arabia and the Gulf countries.[17][18]

Palm

Coconut vinegar, made from fermented coconut water or sap, is used extensively in Southeast Asian cuisine (notably the Philippines, where it is known as sukang tuba), as well as in some cuisines of India and Sri Lanka, especially Goan cuisine. A cloudy white liquid, it has a particularly sharp, acidic taste with a slightly yeasty note.[19]

In the Philippines, there are other types of vinegar also made from palm sap. Like coconut vinegar, they are by-products of tubâ (palm wine) production. The two of the most widely produced are nipa palm vinegar (sukang nipa or sukang sasa) and kaong palm vinegar (sukang kaong or sukang irok). Along with coconut and cane vinegar, they are the four main traditional vinegar types in the Philippines and are an important part of Filipino cuisine.[20] Nipa palm vinegar is made from the sap of the leaf stalks of nipa palm. It has a citrusy flavor note to it and imparts a distinctly musky aroma.[21][19] Kaong palm vinegar is made from the sap of flower stalks of the kaong palm. It is sweeter than all the other Philippine vinegar types and are commonly used in salad dressing.[20] Vinegar from the buri palm sap is also produced, but not the same prevalence as coconut, nipa, and kaong vinegars.[22] Kaong palm vinegar is also produced in Indonesia and Malaysia, though it's not as prevalent as in the Philippines because the palm wine industry is not as widespread in these Muslim-majority countries.[23][24]

Balsamic
Main articles: Traditional Balsamic Vinegar and Balsamic vinegar

Balsamic vinegar is an aromatic aged vinegar produced in the Modena and Reggio Emilia provinces of Italy. The original product—traditional balsamic vinegar—is made from the concentrated juice, or must, of white Trebbiano grapes. It is dark brown, rich, sweet, and complex, with the finest grades being aged in successive casks made variously of oak, mulberry, chestnut, cherry, juniper, and ash wood. Originally a costly product available to only the Italian upper classes, traditional balsamic vinegar is marked "tradizionale" or "DOC" to denote its Protected Designation of Origin status, and is aged for 12 to 25 years. A cheaper non-DOC commercial form described as "aceto balsamico di Modena" (balsamic vinegar of Modena)[25] became widely known and available around the world in the late 20th century, typically made with concentrated grape juice mixed with a strong vinegar, then coloured and slightly sweetened with caramel and sugar.

Balsamic vinegar is made from a grape product. It contains no balsam. A high acidity level is somewhat hidden by the sweetness of the other ingredients, making it mellow. In terms of its nutrition content, balsamic vinegar contains the carbohydrates of grape sugars (some 17% of total composition), making it some 5 times higher in caloric content than typical distilled or wine vinegar.[26]

Cane

Vinegar made from sugarcane juice is most popular in the Philippines, in particular in the northern Ilocos Region (where it is called sukang Iloko or sukang basi), although it also is produced in France and the United States. It ranges from dark yellow to golden brown in color, and has a mellow flavor, similar in some respects to rice vinegar, though with a somewhat "fresher" taste. Because it contains no residual sugar, it is no sweeter than any other vinegar. In the Philippines it often is labeled as sukang maasim (Tagalog for "sour vinegar").

Cane vinegars from Ilocos are made in two different ways. One way is to simply place sugar cane juice in large jars; it becomes sour by the direct action of bacteria on the sugar. The other way is through fermentation to produce a local wine known as basi. Low-quality basi is then allowed to undergo acetic acid fermentation that converts alcohol into acetic acid. Contaminated basi also becomes vinegar.

A white variation has become quite popular in Brazil in recent years, where it is the cheapest type of vinegar sold. It is now common for other types of vinegar (made from wine, rice and apple cider) to be sold mixed with cane vinegar to lower the cost.

Sugarcane sirka is made from sugarcane juice in Punjab, India. During summer people put cane juice in earthenware pots with iron nails. The fermentation takes place due to the action of wild yeast. The cane juice is converted to vinegar having a blackish color. The sirka is used to preserve pickles and for flavoring curries.

Grains
Chinese black vinegar

Chinese black vinegar is an aged product made from rice, wheat, millet, sorghum, or a combination thereof. It has an inky black color and a complex, malty flavor. There is no fixed recipe, so some Chinese black vinegars may contain added sugar, spices, or caramel color. The most popular variety, Zhenjiang vinegar, originates in the city of Zhenjiang in Jiangsu Province, eastern China.[27] Shanxi mature vinegar is another popular type of Chinese vinegar that is made exclusively from sorghum and other grains. Nowadays in Shanxi province, there are still some traditional vinegar workshops producing handmade vinegar which is aged for at least five years with a high acidity. Only the vinegar made in Taiyuan and some counties in Jinzhong and aged for at least three years is considered authentic Shanxi mature vinegar according to the latest national standard. A somewhat lighter form of black vinegar, made from rice, is produced in Japan, where it is called kurozu.

Rice vinegar is most popular in the cuisines of East and Southeast Asia. It is available in "white" (light yellow), red, and black varieties. The Japanese prefer a light rice vinegar for the preparation of sushi rice and salad dressings. Red rice vinegar traditionally is colored with red yeast rice. Black rice vinegar (made with black glutinous rice) is most popular in China, and it is also widely used in other East Asian countries. White rice vinegar has a mild acidity with a somewhat "flat" and uncomplex flavor. Some varieties of rice vinegar are sweetened or otherwise seasoned with spices or other added flavorings.

Malt vinegar made from ale, also called alegar,[28] is made by malting barley, causing the starch in the grain to turn to maltose. Then an ale is brewed from the maltose and allowed to turn into vinegar, which is then aged.[28] It is typically light-brown in color. In the United Kingdom and Canada, malt vinegar (along with salt) is a traditional seasoning for fish and chips. Some fish and chip shops replace it with non-brewed condiment. Salt and vinegar are combined as a common, traditional flavouring for potato crisps;[29][30][31] in some varieties this involves the conversion of the vinegar to sodium acetate, to avoid dampening the product in manufacture.[32]

Spirits
Sherry vinegar

The term spirit vinegar is sometimes reserved for the stronger variety (5% to 21% acetic acid) made from sugar cane or from chemically produced acetic acid.[33] To be called "Spirit Vinegar", the product must come from an agricultural source and must be made by "double fermentation". The first fermentation is sugar to alcohol and the second alcohol to acetic acid. Product made from synthetically produced acetic acid cannot be called "vinegar" in the UK, where the term allowed is "non-brewed condiment".

Sherry vinegar is linked to the production of sherry wines of Jerez. Dark mahogany in color, it is made exclusively from the acetic fermentation of wines. It is concentrated and has generous aromas, including a note of wood, ideal for vinaigrettes and flavoring various foods.[34] Wine vinegar is made from red or white wine, and is the most commonly used vinegar in Southern and Central Europe, Cyprus and Israel. As with wine, there is a considerable range in quality. Better-quality wine vinegars are matured in wood for up to two years, and exhibit a complex, mellow flavor. Wine vinegar tends to have a lower acidity than white or cider vinegars. More expensive wine vinegars are made from individual varieties of wine, such as champagne, sherry, or pinot gris.

The term "distilled vinegar" as used in the United States (called "spirit vinegar" in the UK, "white vinegar" in Canada[35]) is something of a misnomer because it is not produced by distillation but by fermentation of distilled alcohol. The fermentate is diluted to produce a colorless solution of 5% to 8% acetic acid in water, with a pH of about 2.6. This is variously known as distilled spirit, "virgin" vinegar,[36] or white vinegar, and is used in cooking, baking, meat preservation, and pickling, as well as for medicinal, laboratory, and cleaning purposes.[33] The most common starting material in some regions, because of its low cost, is barley malt,[37] or in the United States, corn. It is sometimes derived from petroleum.[38] Distilled vinegar is used predominantly for cooking, although in the UK it is used as an alternative to brown or light malt vinegar. White distilled vinegar can also be used for cleaning, and some types are sold specifically for this purpose.

Culinary uses

Vinegar is commonly used in food preparation,[1] in particular pickling liquids, vinaigrettes and other salad dressings. It is an ingredient in sauces, such as hot sauce, mustard, ketchup, and mayonnaise. Vinegar is sometimes used in chutneys. It is often used as a condiment on its own, or as a part of other condiments. Marinades often contain vinegar. Soups sometimes have vinegar added to them, as is the case with hot and sour soup. In terms of its shelf life, vinegar's acidic nature allows it to last indefinitely without the use of refrigeration.[39]

Beverages
A beverage made from apple vinegar in China

Several beverages are made using vinegar, for instance Posca in ancient Rome. The ancient Greek drink oxymel is made from vinegar and honey, and sekanjabin is a traditional Persian drink similar to oxymel. Other preparations, known colloquially as "shrubs", range from simply mixing sugar water or honey water with small amounts of fruity vinegar, to making syrup by laying fruit or mint in vinegar for several days, then sieving off solid parts and adding considerable amounts of sugar. Some prefer to boil the "shrub" as a final step. These recipes have lost much of their popularity with the rise of carbonated beverages, such as soft drinks.

Diet and metabolism

Preliminary research indicates that consuming two to four tablespoons of vinegar may cause small reductions in post-meal levels of blood glucose and insulin in people with diabetes.[40]

Nutrition

Distilled or red wine vinegar is 95% water, with no fat or protein.[41] In a 100-millilitre (3 1⁄2-US-fluid-ounce) reference amount, distilled vinegar supplies 75 kilojoules (18 kilocalories) of food energy and no micronutrients in significant content.[41] The composition (and absence of nutrient content) for red wine vinegar and apple cider vinegar are the same, whereas balsamic vinegar is 77% water with 17% carbohydrates, 370 kJ (88 kcal) per 100 mL, and contains no fat, protein or micronutrients.[26]

In folk medicine

Since antiquity, folk medicine treatments have used vinegar, but there is no evidence from clinical research to support health claims of benefits for diabetes, weight loss, cancer or use as a probiotic.[1] Some treatments with vinegar pose risks to health.[42] Esophageal injury by apple cider vinegar has been reported, and because vinegar products sold for medicinal purposes are neither regulated nor standardized, such products may vary widely in content and acidity.[43]

Household uses

White vinegar is often used as a household cleaning agent.[1] For most uses, dilution with water is recommended for safety and to avoid damaging the surfaces being cleaned. Because it is acidic, it can dissolve mineral deposits from glass, coffee makers, and other smooth surfaces.[44] Vinegar is known as an effective cleaner of stainless steel and glass. Malt vinegar sprinkled onto crumpled newspaper is a traditional, and still-popular, method of cleaning grease-smeared windows and mirrors in the United Kingdom.[45]

Vinegar can be used for polishing copper, brass, bronze or silver. It is an excellent solvent for cleaning epoxy resin as well as the gum on sticker-type price tags. It has been reported as an effective drain cleaner.[46]

Other uses

Twenty percent acetic acid vinegar can be used as a herbicide,[47] but acetic acid is not absorbed into root systems so the vinegar will only kill the top growth and perennial plants may reshoot.[48]

Applying vinegar to common jellyfish stings deactivates the nematocysts, although not as effectively as hot water.[49] This also applies to the Portuguese man o' war, which, although generally considered to be a jellyfish, is not.[50]

Vinegar is not effective against lice.[51]

Miscellaneous

Most commercial vinegar solutions available to consumers for household use do not exceed 5%. Solutions above 10% require careful handling, as they are corrosive and damaging to the skin.[52]

When a bottle of vinegar is opened, mother of vinegar may develop. It is considered harmless and can be removed by filtering.[53]

Vinegar eels (Turbatrix aceti), a form of nematode, may occur in some forms of vinegar unless the vinegar is kept covered. These feed on the mother of vinegar and can occur in naturally fermenting vinegar.[54]

Some countries prohibit the selling of vinegar over a certain percentage of acidity. As an example, the government of Canada limits the acetic acid of vinegars to between 4.1% and 12.3%.[55]

According to legend, in France during the Black Plague, four thieves were able to rob houses of plague victims without being infected themselves. When finally caught, the judge offered to grant the men their freedom, on the condition that they revealed how they managed to stay healthy. They claimed that a medicine woman sold them a potion made of garlic soaked in soured red wine (vinegar). Variants of the recipe, called Four Thieves Vinegar, have been passed down for hundreds of years and are a staple of New Orleans hoodoo practices.[56][57]

A solution of vinegar can be used for water slide decal application as used on scale models and musical instruments, among other things. One part white distilled vinegar (5% acidity) diluted with two parts of distilled or filtered water creates a suitable solution for the application of water-slide decals to hard surfaces. The solution is very similar to the commercial products, often described as "decal softener", sold by hobby shops. The slight acidity of the solution softens the decal and enhances its flexibility, permitting the decal to cling to contours more efficiently.

When baking soda and vinegar are combined, the bicarbonate ion of the baking soda reacts to form carbonic acid, which decomposes into carbon dioxide and water.[58]

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See also

References
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