Theo Nash
Alcohol is a drug that can be toxic and addictive. It is made through a process called fermentation, where yeast or bacteria react with the sugars in grains, fruits, or vegetables to produce ethanol (ethyl alcohol) and carbon dioxide. Wine, for example, is made from the sugar in grapes, while vodka comes from the sugar in potatoes. The alcohol content of a drink depends on how long it ferments and whether it undergoes distillation, a process that removes water and increases the alcohol concentration. Beer, wine, and spirits are the most common alcoholic beverages, with beer being the most consumed globally.
| Characteristics | Values |
|---|---|
| What is alcohol | A drug called ethanol (ethyl alcohol) |
| How is alcohol made | Through a process called fermentation, where yeast or bacteria react with the sugars in grains, fruits or vegetables to produce ethanol and carbon dioxide |
| Distillation is another method where the concentration of ethyl alcohol is increased above the original fermented mixture | |
| Fortified wines are made by adding distilled spirits to wine | |
| Spirits are alcoholic beverages with a higher concentration of alcohol, produced by distillation | |
| Liquors are spirits that are aged in barrels or infused with flavorings | |
| Beer is made by fermenting malted barley and other cereals, with hops added for flavouring and preservation | |
| Wine is made by fermenting grape juice (white wine) or crushed grapes (red wine) | |
| Cider is made by fermenting fruit | |
| Alcohol content | Beer typically contains 2.25% to 10% ethanol, with German and US beers containing around 5% |
| Wines are typically limited to 12% alcohol content due to yeast dying at higher concentrations | |
| Spirits typically contain 35-40% alcohol by volume |
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What You'll Learn
- Fermentation: a chemical reaction where yeast or bacteria react with sugars to produce ethanol and carbon dioxide
- Distillation: a process that increases the concentration of alcohol in a drink by boiling and condensing vapours
- Fortified wines: wines with added spirits, like sherry and port
- Health risks: alcohol is toxic and addictive, linked to various cancers and other serious health issues
- Whisky maturation: the process of ageing whisky to improve flavour and remove alcoholic irritation
Fermentation: a chemical reaction where yeast or bacteria react with sugars to produce ethanol and carbon dioxide
Alcohol is made by putting grains, fruits, or vegetables through a process called fermentation. This is a chemical reaction where yeast or bacteria react with the sugars in the ingredients to produce ethanol (the alcohol in the drink) and carbon dioxide (which can result in the drink having bubbles).
Fermentation is a chemical reaction that breaks down glucose obtained from fruit and vegetable sources to form ethanol and carbon dioxide. An enzyme in yeast acts as a catalyst for the reaction. The yeast ferments the sugars in grains, fruits, and vegetables. For example, wine is made from the sugar in grapes, and vodka is made from the sugar in potatoes.
The type of alcohol in alcoholic drinks is ethanol, also known as ethyl alcohol. Ethanol production requires fermentation, the natural process of decomposing organic materials containing carbohydrates. It occurs in nature whenever the two necessary ingredients, carbohydrates, and yeast, are available. Yeast is a vegetative microorganism that lives and multiplies in media containing carbohydrates, particularly simple sugars.
The alcohol content of a drink is affected by how long it's left to ferment. Beer may vary in ethanol content from 2.25% by volume to over 10%. German and US beers usually contain about 5% alcohol, while English ales usually contain 2.5–5.5% by volume. There is a limit to the alcohol content of fermented drinks of about 12 percent because alcohol is toxic and kills yeast. Depending on the concentration of alcohol required, fermentation only or fermentation followed by distillation may be used.
Distilled spirits are alcoholic beverages in which the concentration of ethyl alcohol has been increased above that of the original fermented mixture by distillation. The principle of alcoholic distillation is based on the different boiling points of alcohol (78.5 °C) and water (100 °C). If a liquid containing alcohol is heated above 78.5 °C but below 100 °C, the vapour is condensed, resulting in a higher alcohol concentration. Liquors contain significantly more alcohol (ethanol) than other alcoholic drinks and are considered "harder".
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Distillation: a process that increases the concentration of alcohol in a drink by boiling and condensing vapours
Distillation is a process that increases the concentration of alcohol in a drink by boiling and condensing vapours. It is a crucial step in making spirits, separating alcohol from water through evaporation and condensation. This process involves heating the base alcohol, which is typically an already fermented beverage, to a low temperature to vaporise the alcohol, capturing the alcohol vapours, and then cooling them back into a liquid with a higher alcohol content.
The key to successful distillation lies in the fact that alcohol has a lower boiling point than water (173°F vs. 212°F). This allows distillers to evaporate the alcohol separately, collect the vapours, and condense them back into a liquid form with an increased alcohol concentration. The equipment used for distillation, known as stills, come in two main varieties: pot stills and column stills. Pot stills are simpler and more recognisable, while column stills are more complex but offer greater efficiency and continuous production.
The distillation process begins with the preparation of the base or "mash," which can vary depending on the desired spirit. For example, whiskey is typically produced from a beer base made by fermenting grains, while vodka can be made with grain, fruit, or potato-based alcohol. The mash is then transferred to the still, heated, and the resulting alcohol-rich vapours are captured and condensed.
During distillation, various compounds called congeners, such as esters, tannins, methanol, and fusel alcohols, can also evaporate and impact the flavour of the final product. Distillers must carefully control temperature and timing to separate these elements and ensure the desired flavour profile. The distillation process may be repeated multiple times to achieve the desired purity and alcohol content.
While distillation is a critical step in producing spirits, it is just one part of the overall process. Fermentation precedes distillation, and ageing or additional flavouring processes may follow. The specific requirements vary depending on the type of spirit being produced and its desired characteristics.
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Fortified wines: wines with added spirits, like sherry and port
Alcohol is made by putting grains, fruits, or vegetables through a process called fermentation. This is a chemical reaction where yeast or bacteria react with the sugars in the ingredients to produce ethanol (the alcohol in the drink) and carbon dioxide. Wine and cider are made by fermenting fruit, while fermented cereals such as barley and rye form the basis of beer and spirits.
Fortified wines are wines with added spirits, usually brandy, to increase alcohol content and introduce a new dimension of flavour. Fortified wines typically have an alcohol content ranging from 15% to 20% ABV. The fortification process dates back centuries, initially serving as a way to stabilise wine for long voyages. Today, it is considered an art form, producing wines that are rich, complex, and capable of ageing gracefully for decades.
Port wine, or simply port, is a well-known fortified wine from the Douro Valley in the northern provinces of Portugal. It is typically a sweet red wine but also comes in dry, semi-dry, and white or rosé styles. Port wine's roots stretch back to the 17th century when merchants began adding brandy to wine to preserve it for the journey from Portugal to England. Today, port comes in a variety of styles, including tawny, ruby, vintage, and white ports.
Sherry is another popular fortified wine, produced in Southwest Spain from white grapes grown near the town of Jerez. The word "sherry" is an anglicisation of Jerez. Sherry is produced in a range of styles, from dry, light versions such as finos to darker and sometimes sweeter versions known as olorosos. Cream sherry is always sweet. In terms of the fortification process, sherry is typically fortified shortly before or after the end of fermentation, resulting in a drier wine.
In addition to port and sherry, other notable fortified wines include Madeira, a white fortified wine from the Portuguese island of the same name; Marsala, a wine from Sicily available in both fortified and unfortified versions; and Vermouth, a fortified wine flavoured with aromatic herbs and spices, or "aromatised" in the trade. Vermouth is generally available as either dry or sweet and is probably best known as an ingredient in a martini.
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Health risks: alcohol is toxic and addictive, linked to various cancers and other serious health issues
Alcohol is a drug that can be toxic and addictive. Ethanol, the alcohol found in beer, wine, and spirits, is produced when yeast ferments the sugars in grains, fruits, and vegetables. This small molecule travels to virtually all parts of the body, including the brain, causing chemical changes that affect mood, concentration, judgment, and coordination.
While many are aware of alcohol's short-term effects, its long-term health consequences can be more severe. Alcohol is a Group 1 carcinogen, classified by the International Agency for Research on Cancer (IARC) due to sufficient evidence linking it to cancers of the oral cavity, pharynx, larynx, esophagus, and liver. Epidemiological studies show that even light drinkers have an increased risk of certain cancers, with the risk rising significantly for heavy drinkers and binge drinkers. Alcohol's impact on cancer risk is not limited to the amount consumed but also the duration of consumption, with regular, heavy alcohol use damaging the liver and increasing the likelihood of liver cancer.
Additionally, alcohol contributes to weight gain, which is another risk factor for cancer. It also raises estrogen levels, which may explain the heightened risk of breast cancer in women who consume alcohol. The negative health effects of alcohol extend beyond cancer. Consuming multiple alcoholic drinks in a short period can lead to acute alcohol poisoning, and heavy drinking over extended periods increases the risk of developing seven different types of cancer and other serious health issues.
Withdrawal symptoms from alcohol can be life-threatening, including tremors, confusion, hallucinations, and seizures. The UK Chief Medical Officers' low-risk drinking guidelines advise that it is safest for individuals to consume no more than 14 units of alcohol per week, spread over several days with drink-free days, and no bingeing. These guidelines aim to mitigate the harmful physical and mental health consequences of excessive alcohol consumption.
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Whisky maturation: the process of ageing whisky to improve flavour and remove alcoholic irritation
Alcohol is made through a process called fermentation, where yeast or bacteria react with the sugars in grains, fruits, or vegetables to produce ethanol (alcohol) and carbon dioxide. Distilled spirits, such as whisky, have a higher concentration of alcohol and are produced through distillation, which involves heating the liquid to a specific temperature to increase the alcohol concentration.
Whisky maturation, also known as ageing, is a crucial process in improving the flavour and reducing the alcoholic irritation of whisky. This process occurs when the whisky is stored in wooden casks, typically made of oak. The interaction between the whisky and the wood gives the whisky its unique flavour, aroma, and colour. Maturation provides whisky with a mild and smooth texture by removing the irritating alcoholic flavour, resulting in a more mellow drink.
There are three types of whisky maturation: additive, subtractive, and interactive maturation. Additive maturation refers to how the wood of the cask imparts its characteristics to the whisky. The wood contains organic polymers called lignins, which break down in the presence of alcohol, releasing aromatic compounds that contribute to the whisky's flavour and mouthfeel. Different compounds create distinct profiles, with guaicacol imparting a smoky flavour, phenylethanol adding floral notes, and vanillin providing a hint of vanilla sweetness.
The type of oak used also influences the flavour of the whisky. European oak adds spicy and woody notes, while American oak contributes flavours of vanilla and coconut. The previous contents of the cask can also affect the whisky's flavour, with casks previously used for maturing spirits like sherry or bourbon imparting unique characteristics. The number of times a cask has been reused, known as the fill, also plays a role, with first-fill casks requiring careful monitoring to prevent the whisky from being overpowered by the wood's compounds.
While the precise mechanism of flavour improvement during whisky maturation remains unknown, studies have employed techniques such as dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS) to understand the relationship between liquid structure and flavour maturation. These studies revealed the presence of clusters formed by extractives from oak casks during maturation, with small clusters increasing in concentration and playing a crucial role in obtaining flavorful whiskies. Additionally, changes in the liquid structures of H2O and ethanol through hydrogen bonding during maturation contribute to the reduction of alcoholic irritation.
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Frequently asked questions
The chemical name for the alcohol in alcoholic drinks is ethanol, also known as ethyl alcohol.
Ethanol is produced by putting grains, fruits or vegetables through a process called fermentation. This is a chemical reaction where yeast or bacteria react with the sugars in the ingredients to produce ethanol and carbon dioxide.
Distillation is a process used to increase the concentration of ethanol in a drink. It involves heating a liquid containing ethanol to a temperature above its own boiling point (78.5 °C or 173.3 °F) but below that of water (100 °C or 212 °F). The vapour is then condensed, resulting in a higher alcohol concentration.
