How many ATPs are produced in fermentation

How Many ATPs are Produced in Fermentation, Lactic Acid Fermentation, and Alcohol Fermentation Process

Fermentation starts with pyruvates to produces the end products of fermentation. As fermentation requires carbohydrates (for example glucose) to produce end products, these carbohydrates first need to undergo a step by step breakdown process.  In this article, we will find the answer to ‘ How many ATPs are produced in fermentation ‘.

Does Fermentation Produce ATP?

 

The answer is YES.

The fermentation produces TWO ATPs, in the glycolytic pathway.

 

 

How many ATPs are produced in fermentation:

 

Two ATPs are produced in fermentation, mainly in the glycolysis process.

Glucose  first converts to pyruvates through glycolysis process and then to lactic acids or alcohol as well as other products of fermentation. In the glycolysis process, 2 pyruvates, 2 net ATP, and 2 NADH are produced.

Glucose + ATP +Pi + NAD+→ 2 pyruvate +2ATP +2NADH

Pyruvic acid ­­­­­­­+NADH → Lactic acids / Alcohol + NAD+.

Fermentation breakdown pyruvates to produce the end products of fermentation such as lactic acids or alcohol etc. It converts NAD+ to NADH, but produces no ATP.

How Many ATPs are Produced in Fermentation, Lactic Acid Fermentation, and Alcohol Fermentation process

Glycolysis needs two moles of ATP to breakdown one mole of glucose. However, at the end of glycolysis, four moles of ATP are produced, resulting in the production of net 2 moles ATP from each mole of glucose.

 

Although glycolysis is an aerobic process, it still requires an oxidizing agent to converts NAD+ to NADH.

But fermentation converts NADH to NAD+ an oxidizing agent that helps the glycolysis generate more ATP.

Therefore 2 ATP are produced in fermentation, mainly in the glycolysis process.

 

How Many ATPs are Produced in Alcoholic Fermentation:

Two ATPs are produced in Alcohol Fermentation.

In Alcoholic fermentation one mole of glucose is converted to two moles of ethanol, two moles of carbon dioxide, producing two moles of ATP in the process.

Glucose + ADP + Pi —→ Lactate + 2Ethanol + 2CO2 + 2NAD+ + 2ATP

 

How Many ATPs are Produced in Lactic Acid Fermentation:

Two ATPs are produced in Lactic Acid Fermentation.

  1. In Homofermentative lactic acid fermentation, two molecules of lactic acids, 2NAD+, and two ATPs are produced from glucose.

Glucose + 2ADP + 2Pi —→ 2 Lactate + 2NAD+ + 2 ATP.

How Many ATPs are Produced in Fermentation, Lactic Acid Fermentation, and Alcohol Fermentation technology

 

  1. In Heterofermentative lactic acid fermentation one molecule of lactic acids, ethanol, carbon-di-oxide, 2NAD+, and two ATPs are produced from glucose.

Glucose + ADP + Pi —→ Lactate + Ethanol + CO2 + 2NAD+ + 2ATP.

How Many ATPs are Produced in Fermentation, Lactic Acid Fermentation, and Alcohol Fermentation technology

 

The main purpose of alcohol and lactic acid fermentation is to generate two ATP, the energy flow for cells.

 

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What are the Products of Lactic Acid Fermentation

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So how many ATPs are produced in fermentation?

The answer is TWO ATPs.

 

If you have any questions, feel free to comment here.

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1 thought on “How many ATPs are produced in fermentation”

  1. Whereas lack of an appropriate inorganic final electron acceptor is environmentally dependent, the other two conditions are genetically determined. Thus, many prokaryotes, including members of the clinically important genus for reuse as an electron carrier for glycolysis, the cell’s only mechanism for producing any ATP, to continue. Some living systems use an organic molecule (commonly pyruvate) as a final electron acceptor through a process called fermentation. Fermentation does not involve an electron transport system and does not directly produce any additional ATP beyond that produced during glycolysis by substrate-level phosphorylation. Organisms carrying out fermentation, called fermenters, produce a maximum of two ATP molecules per glucose during glycolysis. Table 1 compares the final electron acceptors and methods of ATP synthesis in aerobic respiration, anaerobic respiration, and fermentation. Note that the number of ATP molecules shown for glycolysis assumes the Embden-Meyerhof-Parnas pathway. The number of ATP molecules made by substrate-level phosphorylation (SLP) versus oxidative phosphorylation (OP) are indicated.

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