Question

What is the difference between homolactic and heterolactic fermentation?

Answer 1

In homolactic fermentation, one molecule of glucose is ultimately converted to two molecules of lactic acid. 

Heterolactic fermentation, in contrast, yields carbon dioxide and ethanol in addition to lactic acid, in a process called the phosphoketolase pathway.

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Answer 2

Explanation:

Homolactic fermentation is as follow.

• One molecule of glucose gets converted into two molecules of lactic acid.
• In gram positive lactic acid bacteria, homolactic fermentation occurs and this contains the important enzyme aldolase.
• For example, homolactic fermentation occurs in Lactobacillus delbrueckii .

Heterolactic fermentation is as follows.

• In addition to lactic acid, heterolactic fermentation produces carbon dioxide and ethanol.
• In gram positive lactic acid bacteria, heterolactic fermentation occurs and it lacks the important enzyme aldolase.
• For example, Leuconostoc mesenteroides is a heterolactic fermenter.