Module 2 Flashcards
LAB Classification
Firmicutes –> Bacilli –> Lactobacillales
General LAB Description
Acid tolerant, non-spore formers, Non-respiring, Cocci or rods
LAB Growth is
Fastidious
Metabolism of LAB
Strict fermentation with lactic acid as the major end product
Phenotypic classification
Type of fermentation; does not match rRNA phylogeny
LAB Strains
Enterococcous, Lactococcus, Lactobacacillus, Streptococcus, Vagococcus
Group D
Enterococci
Group N
Lactococcus and Vagococcus
Streptococcus Groups
Oral and Pyogenic
Most widely used in cheese fermentation
Lactococcus lactis
Probiotics and silage starter
E. faecium and faecalis
Wide span of mol G+C
Lactobacillus (32-53%)
Group 1 obligatory homofermentative
Only produce lactic acid (no CO2)
Group II facultatively Heterofermentative
Only lactic acid under certain conditions but can ferment pentose
Present in Homo
FDP Aldolase
Present in FH
Pentose fermentation, CO2 from gluconate, FDP aldolase, PK