Zymomonas
Encyclopedia
Zymomonas is a genus of bacteria
. The best known species from this genus is Zymomonas mobilis
. Members of this genus are gram negative, facultative anaerobic
, non-sporulating, polarly-flagellated, rod-shaped bacteria.
It is a fermenting bacteria that contributes to cider sickness and beer spoilage.
Zymomonas is a bacterium that has a near theoretical ethanol yield from glucose, no oxygen requirement thus negating the need for expensive oxygen transfer, and high ethanol tolerance making it an effective microbe for ethanol biofuel production.
and hydrogen sulfide
. This can be likened to a rotten apple smell or fruity odor. Zymomonas haven't been reported in lager breweries due to the low temperatures (8 to 12 degrees Celsius) and stringent carbohydrate requirements (able to ferment only sucrose, glucose, and fructose). It is commonly found in cask-conditioned ales where priming sugar is used to carbonate the beer. The optimum growth temperature is 25 to 30 degrees Celsius.
Bacteria
Bacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...
. The best known species from this genus is Zymomonas mobilis
Zymomonas mobilis
Zymomonas mobilis is a bacterium belonging to the genus Zymomonas. It is notable for its bioethanol-producing capabilities, which surpass yeast in some aspects. It was originally isolated from alcoholic beverages like the African palm wine, the Mexican pulque, and also as a contaminant of cider and...
. Members of this genus are gram negative, facultative anaerobic
Anaerobic organism
An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. It could possibly react negatively and may even die if oxygen is present...
, non-sporulating, polarly-flagellated, rod-shaped bacteria.
It is a fermenting bacteria that contributes to cider sickness and beer spoilage.
Zymomonas is a bacterium that has a near theoretical ethanol yield from glucose, no oxygen requirement thus negating the need for expensive oxygen transfer, and high ethanol tolerance making it an effective microbe for ethanol biofuel production.
Beer spoilage
Zymomonas is a waterborne unwanted bacteria in beer, creating an estery-sulfury flavour due to the production of acetaldehydeAcetaldehyde
Acetaldehyde is an organic chemical compound with the formula CH3CHO or MeCHO. It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale industrially. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit, and is produced by plants as part...
and hydrogen sulfide
Hydrogen sulfide
Hydrogen sulfide is the chemical compound with the formula . It is a colorless, very poisonous, flammable gas with the characteristic foul odor of expired eggs perceptible at concentrations as low as 0.00047 parts per million...
. This can be likened to a rotten apple smell or fruity odor. Zymomonas haven't been reported in lager breweries due to the low temperatures (8 to 12 degrees Celsius) and stringent carbohydrate requirements (able to ferment only sucrose, glucose, and fructose). It is commonly found in cask-conditioned ales where priming sugar is used to carbonate the beer. The optimum growth temperature is 25 to 30 degrees Celsius.