Genus/species: Lactobacillus kunkeei
Gram Stain: Positive
Cell: rod-shaped cells
Colony: thin, almost translucent colonies, off-white in color
Liquid Growth: likely dispersed
The bacteria produces lactic acid from glucose, possessed weak catalase activity, and fermented relatively few carbohydrates (glucose, fructose, sucrose, raffinose (weakly) and mannitol). Is an aerotolerant organism.
Grape juice only medium found.
Known for causing especially “ferocious" spoilages.
Role in wine:
The bacteria is a spoilage organism in grape juice that has been relatively recently discovered. Is a strain of Lactobacillus known to strongly inhibit yeast.
- SO2: yes
- Sorbate: no
- DMDC: yes
- pH: yes, exist at < 5
- Acids: no
- Ethanol: yes, at higher levels
- Anaerobiosis: no
- Heat: no