Lena Savoie
The production of ethyl alcohol is a topic that involves biological processes that occur in the presence or absence of oxygen. Anaerobic cellular respiration, which takes place when oxygen is absent, involves the conversion of sugars into ethyl alcohol and carbon dioxide. This process is carried out by yeast and certain bacteria, and it is particularly important for energy generation in low-oxygen environments. On the other hand, aerobic respiration requires oxygen and does not produce ethyl alcohol as a byproduct. Understanding whether ethyl alcohol goes through an anaerobic or aerobic process is crucial for various applications, including the production of alcoholic beverages, ethanol fuel, and bread dough rising.
| Characteristics | Values |
|---|---|
| Process | Anaerobic |
| Occurrence | In yeast and certain bacteria |
| Raw Material | Fermentable sugars such as glucose, fructose, and sucrose |
| End Products | Ethyl alcohol, carbon dioxide, and other congeneric products |
| Byproducts | Heat, carbon dioxide, food for livestock, water, methanol, fuels, fertilizer, and alcohols |
| Use Cases | Alcoholic beverages, ethanol fuel, and bread dough rising |
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What You'll Learn
Anaerobic respiration
During anaerobic respiration, glucose is only partially broken down, resulting in incomplete oxidation. Consequently, less energy is released compared to aerobic respiration. The byproducts of this process are ethyl alcohol (ethanol) and carbon dioxide. In yeast, the equation for anaerobic respiration can be summarized as follows:
> C6H12O6 → 2 C2H5OH + 2 CO2 + 2 ATP
This equation illustrates the conversion of one mole of glucose (C6H12O6) into two moles of ethanol (C2H5OH) and two moles of carbon dioxide (CO2), with two moles of ATP produced.
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Ethanol fermentation
During ethanol fermentation, the first step is glycolysis, where glucose is broken down into two pyruvate molecules. This step is summarised by the equation:
C6H12O6 + 2 ADP + 2 Pi + 2 NAD+ → 2 CH3COCOO− + 2 ATP + 2 NADH + 2 H2O + 2 H+
The second step involves the conversion of pyruvate into ethanol and carbon dioxide. This step is catalysed by alcohol dehydrogenase (ADH1 in baker's yeast), which regenerates the NAD+ needed for glycolysis. The overall chemical equation for the fermentation of sucrose (C12H22O11) into ethanol (C2H5OH) is:
C6H12O6 + 2 ADP + 2 Pi → 2 C2H5OH + 2 CO2 + 2 ATP
While ethanol fermentation typically occurs in anaerobic conditions, some yeasts, such as Saccharomyces cerevisiae, can produce ethanol even in the presence of oxygen under certain conditions. This is known as the counter-Pasteur effect and is utilised in winemaking.
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Yeast and bacteria
The production of ethyl alcohol, or ethanol, is a result of an anaerobic process. This process is carried out by yeast and certain bacteria, which convert sugars into energy in the absence of oxygen. This process is known as alcoholic fermentation or anaerobic respiration.
Yeast is a unique organism that can survive and thrive in both aerobic and anaerobic environments. In the presence of oxygen, yeast undergoes aerobic respiration, converting glucose and oxygen into carbon dioxide and water. This process is important in bread-making, as it causes the dough to rise. However, when the oxygen is depleted, yeast switches to anaerobic respiration, converting carbohydrates into carbon dioxide and alcohol. This process is utilised in the production of alcoholic beverages, biofuels, and in cooking.
The ability of yeast to perform both aerobic and anaerobic respiration is due to its dual nature. During fermentation, yeast can produce ethanol in an anaerobic environment. However, some species of yeast, such as Kluyveromyces lactis and Kluyveromyces lipolytica, will only produce ethanol anaerobically, and will oxidise pyruvate completely to carbon dioxide and water in the presence of oxygen. On the other hand, yeasts such as baker's yeast (Saccharomyces cerevisiae) and fission yeast (Schizosaccharomyces pombe) can ferment even in the presence of oxygen, producing ethanol under aerobic conditions if provided with the right nutrition.
In addition to yeast, certain bacteria also play a role in anaerobic respiration. This process is particularly important for bacteria that survive in low-oxygen environments, such as those found in the deepest parts of the ocean near hydrothermal vents. These bacteria break down glucose anaerobically, producing ethyl alcohol and carbon dioxide. Examples of anaerobic bacteria include E. coli and Salmonella.
Overall, the production of ethyl alcohol is a result of anaerobic respiration, which is carried out by yeast and certain bacteria. Yeast is unique in its ability to thrive in both aerobic and anaerobic conditions, while certain bacteria are specifically adapted to survive and perform anaerobic respiration in low-oxygen environments.
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Aerobic respiration
The first stage of aerobic respiration is glycolysis, which takes place in the cytoplasm of cells. In this stage, glucose is converted into pyruvate under anaerobic conditions, producing a small amount of ATP and NADH. The second stage occurs in the mitochondria and is called the tricarboxylic acid (TCA) cycle or Krebs cycle. During this stage, pyruvate is oxidised to carbon dioxide and water in the presence of oxygen, generating more NADH and another molecule called FADH2.
The NADH and FADH2 produced in both stages then enter the electron transport chain, where they are converted into more ATP through oxidative phosphorylation. This process involves the transfer of electrons from NADH and FADH2 to oxygen, creating an electrochemical gradient and pumping protons across a membrane. This gradient is then used to drive ATP synthase, producing ATP from ADP and a phosphate group. Overall, aerobic respiration is a highly efficient process that yields a large amount of ATP, with estimates ranging from 29 to 38 ATP molecules produced per molecule of glucose.
In contrast to anaerobic respiration, aerobic respiration requires the presence of oxygen to carry out the metabolic reactions involved. While anaerobic respiration can occur in the absence of oxygen and is utilised by certain organisms such as yeast and some bacteria, aerobic respiration is the preferred method for generating energy in most living organisms. It is important to note that fermentation, which is commonly associated with ethanol production, is an anaerobic process and is not considered respiration as it does not involve an external electron acceptor.
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Alcoholic fermentation
During alcoholic fermentation, the enzyme invertase breaks the bond between glucose and fructose molecules in the first step. In the next step, each glucose molecule is broken down into two pyruvate molecules through glycolysis. The pyruvate molecule is then converted into ethanol and carbon dioxide, regenerating the oxidized NAD+ required for glycolysis. This process is catalysed by alcohol dehydrogenase (ADH1 in baker's yeast).
In addition to its applications in food and beverage production, alcoholic fermentation also produces unharvested by-products such as heat, carbon dioxide, water, methanol, fuels, fertiliser, and other alcohols. These by-products have various uses, such as generating energy and creating food for livestock.
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Frequently asked questions
Ethyl alcohol, also known as ethanol, is a colourless, volatile, flammable liquid. It is often produced by means of yeast-induced fermentation.
Ethyl alcohol is produced through anaerobic respiration. This is a biological process that occurs when oxygen is not present, allowing organisms to convert sugars into energy. The by-products of this process are ethanol and carbon dioxide.
Anaerobic respiration is commonly found in yeasts and some bacteria. It is also seen in some species of fish, including goldfish and carp, and in some plants and fungi. Ethanol fermentation, which is a form of anaerobic respiration, is the basis for alcoholic beverages, ethanol fuel and bread dough rising.
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