Noah Vinter
Alcoholic beverages are formed by fermenting the sugars in fruits, berries, grains, plant saps, tubers, honey, and milk. The alcohol formed in these beverages is called ethanol, which 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 other ingredients to produce ethanol 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. Spirits are also distilled, which increases the concentration of alcohol in the final product. Alcoholic fermentation is carried out by yeast and some other fungi and bacteria. The first step of the alcoholic fermentation pathway involves pyruvate, which is formed by yeast via the EMP pathway.
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What You'll Learn
Alcoholic drinks are made by fermenting fruit juices
Wine and cider are made by fermenting fruit juices. For example, wine is made by fermenting the juices of grapes or other fruits such as apples, cherries, berries, or plums. Cider is also made from fruit juice, most commonly apple juice, but also from other fruits such as peaches, pears, or other fruit juices. The type of yeast used in the fermentation process is S. cerevisiae, which becomes the dominant species during alcoholic fermentation due to the low pH and high sugar and ethanol concentrations, as well as the anaerobic conditions. The fermentation process can be carried out by different microorganisms that act sequentially.
Brandy is another alcoholic drink that is distilled from wine or fermented fruit juice. Any fruit juice can be used as a starting point for fermentation to produce alcohol, as any material that contains sugars or starches can undergo this process. However, fruits and grains are often used because they are naturally high in the carbohydrates needed for fermentation.
The alcohol content of a drink is affected by how long it is left to ferment. Generally, the longer a drink is left to ferment, the higher the alcohol content will be. However, distillation can also be used to increase the alcohol content of a drink by removing a proportion of the water. Spirits, such as vodka and rum, are made by distilling fermented liquids to concentrate the alcohol.
It is important to note that alcohol is toxic, and consuming several alcoholic drinks in a short period can lead to acute alcohol poisoning. Alcohol also has a depressant effect on the brain, contributing to feelings of anxiety as the brain readjusts when the alcohol wears off.
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Fermentation of yeast, sugars, and starches produces ethanol
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 other ingredients to produce ethanol (the alcohol in the drink) and carbon dioxide (which can mean the drink has bubbles).
Ethanol fermentation, also called alcoholic fermentation, is a biological process that converts sugars such as glucose, fructose, and sucrose into cellular energy, producing ethanol and carbon dioxide as by-products. Ethanol fermentation is the basis for alcoholic beverages, ethanol fuel, and bread dough rising. The chemical equation for the fermentation of sucrose (C12H22O11) into ethanol (C2H5OH) is:
> C6H12O6 + 2 ADP + 2 Pi → 2 C2H5OH + 2 CO2 + 2 ATP
The yeast Saccharomyces cerevisiae has been the most widely used organism for ethanol fermentation. In the United States, the primary feedstock for ethanol production is corn (maize) grain as a source of readily fermentable starch, but sorghum and other agricultural feedstocks are also used. In Brazil, it is sugarcane as a source of sugar. The "bagasse," or crushed stalk of the sugarcane plant, can be used as a solid fuel and burned for heat and electricity.
In the production of alcoholic beverages, wine and cider are made by fermenting fruit, while fermented cereals such as barley and rye form the basis of beer and spirits. Spirits also go through a process called distillation, where a proportion of the water is removed, leaving a stronger concentration of alcohol in the final product. The alcohol content of a drink is affected by how long it's left to ferment.
Yeast fermentation of various carbohydrate products is also used to produce the ethanol that is added to gasoline. The dominant ethanol feedstock in warmer regions is sugarcane, while in temperate regions, corn or sugar beets are used.
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Alcohol is a chemical and a psychoactive drug
Alcohol is a central nervous system (CNS) depressant, decreasing electrical activity in the neurons of the brain, causing the characteristic effects of alcohol intoxication. These effects include euphoria, decreased anxiety, increased sociability, sedation, and impaired cognitive, memory, motor, and sensory function.
Alcohol is also a psychoactive drug, recognised as such by the World Health Organization. Psychoactive drugs are substances that alter mental function when consumed, affecting how the brain works and causing changes in mood, awareness, thoughts, feelings, or behaviour. Alcohol disrupts the brain's communication pathways and impacts how the brain processes information, causing structural changes in the prefrontal area of the brain and the left cerebellum.
In addition to ethanol, alcoholic beverages contain several types of psychoactive alcohols, including primary, secondary, and tertiary alcohols. The tertiary alcohol tert-amyl alcohol (TAA) has been used as a hypnotic and anesthetic. Alcohol interacts with other drugs, such as cocaine and cannabis, altering their effects.
The production of alcohol involves putting grains, fruits, or vegetables through a process called fermentation, where yeast or bacteria react with sugars in the ingredients to produce ethanol and carbon dioxide. The alcohol content of a drink depends on how long it is left to ferment. Distillation is another process used in the production of spirits, where a proportion of the water is removed to create a stronger concentration of alcohol.
Alcohol has been consumed by humans for its psychoactive effects for thousands of years, and it is the second most consumed psychoactive drug globally, after caffeine. While alcohol is generally socially acceptable and legal in most countries, there are often restrictions on its sale and use, such as a minimum age for drinking and laws against public drinking and drinking and driving.
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Alcoholic drinks can be fortified with additional juice
The most common approach to fortifying beverages is to add ingredients classified as antioxidants, either in the form of a whole food, usually a juice, or an added nutrient, such as a plant extract or isolated vitamin. Antioxidants help the body fight damage from free radicals, which may cause cells to grow and reproduce abnormally. Free radicals are caused by oxidation, which occurs naturally when we breathe, exercise, or digest food. Vitamins C and E are both well-known antioxidants frequently added to beverages, as are plant concentrates and extracts high in known antioxidants such as carotenoids and polyphenols.
Tea is also used quite often to fortify beverages. Food and beverage fortification dates back to the early 1930s when dairy processors started adding vitamin D to fluid milk to prevent rickets, a bone-debilitating disease linked to a deficiency in the fat-soluble vitamin. Fortified beverages can also be used to fill nutritional gaps. For example, a night-time drink might contain ingredients to promote relaxation and drowsiness.
Alcoholic drinks can be made from grains, fruits, or vegetables through a process called fermentation. Alcoholic drinks can also be made from cereals such as barley and rye, which form the basis of beer and spirits. Cider is a fermented alcoholic drink made from fruit juice, usually apple juice, but also from peaches, pears, or other fruits. Wine coolers are beverages containing wine to which ingredients such as fruit juice or other flavorings have been added.
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Alcohol is formed when oxygen and hydrogen bind with carbon
Alcohol is a broad term for a range of molecules formed when oxygen and hydrogen atoms bind with carbon. This process is known as hydrogen bonding, which occurs when hydrogen bonds are formed through the dipole-dipole interaction between a hydrogen atom and a highly electronegative atom. In the case of water molecules (H2O), hydrogen is bonded covalently to the electronegative oxygen atom.
In alcoholic drinks, the alcohol is a specific small molecule called ethanol. Ethanol is a longer molecule, and the oxygen atom brings with it an extra 8 electrons. Ethanol is produced when grains, fruits, or vegetables are fermented. This is a chemical reaction where yeast or bacteria react with the sugars in the other ingredients to produce ethanol and carbon dioxide. The carbon dioxide can cause the drink to become carbonated and bubbly.
The ethanol molecules are absorbed into the bloodstream when consumed, and due to their small size, they can travel to almost all parts of the body, including the brain. Ethanol is both a weak base and a weak acid. It is a psychoactive substance, causing chemical changes in the brain and suppressing normal activity in the area that controls inhibition. This is why alcohol can contribute to feelings of anxiety.
The alcohol content of a drink is affected by how long it is left to ferment. Drinks with higher alcohol content, such as spirits, go through a process called distillation, where a proportion of the water is removed, resulting in a stronger concentration of alcohol.
Alcoholic beverages can also contain methanol, which originates from pectins in the must and juice when grapes and fruits are macerated. Methanol content is generally small, except in certain brandies produced from stone fruits.
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Frequently asked questions
Alcohol is a molecule formed when oxygen, hydrogen, and carbon atoms bind together. It is made by putting grains, fruits, or vegetables through a process called fermentation. Juices are made from fruits and do not contain alcohol.
Fermentation is a chemical reaction where yeast or bacteria reacts with the sugars in the ingredients to produce ethanol (alcohol) and carbon dioxide.
Alcoholic fermentation is the best-known fermentation process, involving the transformation, stabilization, and conservation of sugar-rich substrates such as fruit and fruit and vegetable juices.
Juices are sometimes added to alcoholic beverages to create mixed drinks, such as wine coolers or malt beverages. Juices are also used in wine fraud, where they are added to wine to increase volume.
