Theo Nash
Alcoholic and lactic acid fermentation are both biochemical processes that produce different by-products. Alcoholic fermentation, also known as ethanol fermentation, is a process that converts sugars and other carbohydrates into alcohol and carbon dioxide through the action of microorganisms, primarily yeast or bacteria. Lactic acid fermentation, on the other hand, is a process where bacteria convert sugar molecules into lactic acid. This process is used in the production of foods like yogurt and cheese, and it can also occur in muscle cells during strenuous exercise when oxygen levels are low.
| Characteristics | Alcoholic Fermentation | Lactic Acid Fermentation |
|---|---|---|
| Process | Pyruvic acid is converted into ethanol (alcohol) and carbon dioxide. | Pyruvic acid is converted into lactate. |
| Byproducts | Carbon dioxide, glycerin, succinic acid, amylic alcohol. | Carbon dioxide. |
| Organisms | Occurs due to the action of yeast. | Occurs due to the action of bacteria. |
| Energy Production | Produces 2 molecules of ATP. | No ATP is produced. |
| Use | Used in the making of alcoholic beverages, bread, and carbonated beverages. | Used in mammalian red blood cells and in skeletal muscles. |
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What You'll Learn
Alcoholic fermentation produces ethanol
Alcoholic fermentation and lactic acid fermentation are two types of fermentation processes. Fermentation is an important process for making ATP without oxygen, starting with glycolysis, which does not require oxygen. Alcoholic fermentation occurs by the action of yeast, whereas lactic acid fermentation occurs due to bacterial action.
The process of alcoholic fermentation involves the breakdown of pyruvate molecules, which are produced through the splitting of glucose by glycolysis. This breakdown results in the production of acetaldehyde, carbon dioxide, and eventually ethanol. Alcoholic fermentation requires electrons from NADH and leads to the generation of NAD+.
Yeast in bread dough utilizes alcoholic fermentation for energy, producing carbon dioxide gas as a waste product. Additionally, alcoholic fermentation yields other products, such as glycerin, succinic acid, and amylic alcohol. These observations suggest that fermentation is an organic process.
In summary, alcoholic fermentation, facilitated by yeast, results in the production of ethanol, with other by-products like carbon dioxide and glycerin. This process is essential in various industries, including food and beverage production, such as bread-making and winemaking.
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Lactic acid fermentation occurs in muscle cells with low oxygen
During strenuous exercise, the body's respiratory and cardiovascular systems cannot transport oxygen to the muscle cells fast enough to maintain aerobic respiration. In such low-oxygen conditions, muscle cells use lactic acid fermentation to produce ATP. This process involves converting glucose to lactic acid through glycolysis, which breaks down glucose molecules into two pyruvate molecules, producing a net gain of two ATP, two NADH molecules, and regenerating NAD+ in the process.
Lactic acid fermentation allows glycolysis to continue making ATP, as NAD+ is limited in each cell and must be regenerated for ATP production to persist. The accumulation of lactic acid in muscle cells during fermentation is associated with muscle fatigue, soreness, and pain. While it was once believed that lactic acid caused muscle cramps, recent research suggests that cramps may be due to a lack of potassium in muscles, leading to contractions under high stress.
Lactic acid fermentation is not unique to humans. Chickens and grouse, for example, use anaerobic respiration in the white cells of breast and wing muscles, enabling rapid ATP production during short bursts of speed.
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Pyruvic acid is converted into ethanol and CO2 during alcoholic fermentation
Fermentation is an important process for making ATP without oxygen. While glycolysis does not require oxygen, fermentation does not involve the latter two stages of aerobic cellular respiration. There are two types of fermentation: alcoholic fermentation and lactic acid fermentation.
Alcoholic fermentation is a process that starts with glycolysis, which is the chemical breakdown of glucose to lactic acid. Glycolysis requires 11 enzymes that degrade glucose to lactic acid. The process of alcoholic fermentation is identical to glycolysis except for the final step. In alcoholic fermentation, pyruvic acid is broken down into ethanol and carbon dioxide.
The process of alcoholic fermentation is used by yeast in bread dough to produce carbon dioxide gas as a waste product. It is also used by yeast cells during the production of beer or wine, where it contributes to the alcoholic content of these beverages.
In summary, pyruvic acid is converted into ethanol and CO2 during alcoholic fermentation through the action of enzymes and the use of energy from NADH. This process is important for the production of food and beverages, such as bread, beer, and wine.
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Lactic acid fermentation is caused by bacteria
Lactic acid fermentation is a metabolic process carried out by specific bacteria, such as Lactobacillus, bifidobacteria, and certain other microorganisms. This process results in the production of lactate and, in some cases, ethanol, acetate, and carbon dioxide. Lactic acid fermentation is an anaerobic process, meaning it occurs in the absence of oxygen. It involves the conversion of glucose or other six-carbon sugars into cellular energy and the metabolite lactate, which is lactic acid.
Lactic acid fermentation is commonly associated with the souring of milk and the production of dairy products like yogurt. This process is caused by bacteria such as Lactobacillus bulgaricus and Streptococcus thermophilus, which are required by law in the United States and Europe for yogurt production. These bacteria produce lactic acid in milk, lowering its pH and causing it to thicken. Additionally, these bacteria produce compounds that give yogurt its distinctive flavour.
Lactic acid fermentation also has applications in the transformation and preservation of various foods, including vegetables and sourdough bread. For example, Lactococcus lactis enables the simultaneous saccharification and fermentation of wheat starch to lactic acid. Additionally, Lactobacillus fermentum Ogi E1, isolated from Benin maize sourdough, is an acid-tolerant microorganism that effectively produces lactic acid from sourdough.
Furthermore, lactic acid fermentation plays a role in human physiology. It occurs in muscle cells during periods of intense activity, resulting in muscle fatigue and pain. Lactic acid fermentation in muscles involves the conversion of pyruvate to lactic acid, which regenerates NAD+ and allows glycolysis to continue producing ATP in low-oxygen conditions. This process is similar to the anaerobic respiration carried out by yogurt bacteria, which also produce lactic acid.
Lactic acid fermentation is a versatile process caused by specific bacteria that have various applications in food production and human physiology. It involves the conversion of sugars or pyruvate into lactic acid, which has both functional and preservative roles in different contexts.
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Alcoholic fermentation also produces carbon dioxide
Fermentation is an important process for making ATP without oxygen. While glycolysis does not require oxygen, fermentation does not involve the latter two stages of aerobic cellular respiration. There are two types of fermentation: alcoholic fermentation and lactic acid fermentation.
Alcoholic fermentation occurs by the action of yeast, and it produces ethanol, an alcohol. Pyruvic acid can be converted into ethanol and carbon dioxide through the alcoholic fermentation pathway. Yeast in bread dough uses alcoholic fermentation for energy and produces carbon dioxide gas as a waste product. The carbon dioxide is used in bread-making and the production of carbonated beverages.
The process of alcoholic fermentation starts with glycolysis, which produces two molecules of ATP. The continued breakdown of pyruvate produces acetaldehyde, carbon dioxide, and eventually ethanol. Alcoholic fermentation requires the electrons from NADH and results in the generation of NAD+.
Lactic acid fermentation, on the other hand, occurs by the action of bacteria. It is common in muscle cells that have run out of oxygen. Lactic acid fermentation produces lactate, which is recycled into glucose by the liver in mammals.
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Frequently asked questions
Alcoholic fermentation is the process by which pyruvic acid is converted into ethanol and carbon dioxide. It is carried out by yeast and some bacteria.
Along with ethanol and carbon dioxide, alcoholic fermentation produces glycerin, succinic acid, and amylic alcohol.
Lactic acid fermentation is a type of fermentation that occurs in mammalian red blood cells and skeletal muscles that do not have enough oxygen supply for aerobic respiration. It is carried out by bacteria.
Lactic acid fermentation produces lactate, which in mammals is recycled into glucose by the liver.
