Marcus Schicklberger Lactic Acid Bacteria Gram positive Non sporforming Anaerobes lack catalase Acid and halotolerant Ferment glucose to only lactic acid or to lactic acid CO 2 and ID: 787255
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Slide1
Lactic Acid Bacteria
Hopkins Microbiology Course 2010
Marcus
Schicklberger
Slide2Lactic Acid Bacteria
Gram positive
Non-
sporformingAnaerobes, lack catalaseAcid- and halotolerantFerment glucose to only lactic acid or to lactic acid, CO2 and EtOHObtain energy only from the metabolism of sugarsHave limited biosynthetic abilities complex mediaoften plant- and animal-associatedDon´t need iron advantage: no pathogens in nicheStreptococcus pneumoniae: meningitis, pneumonia
Lactobacillus
acidophilus
Slide3homofermentative
heterofermentative
Slide4Lactic Acid Bacteria in
foodproduction
among
the
most
improtant
bacteria
in
food
fermentation
contribute
to
taste
and
texture
of
fermented
products
inhibit
food
spoilage
bacteria
by
producing
growth
inhibiting
substances
and
large
amounts
of
lactic
acid
.
Slide5pH
initial
= 6.0
pHfinal = 4.2plate cabbage juice on glucose-CaCO3 plates
O
2
O2- H
2
O
2
H
2
O+O
2
e
-
e
-
catalase
CaCO
2
Ca
2
+
+CO
3
2-
HCO
3
-
H
2
CO
3
H
2
O+CO
2
H
+
H
+
Isolation of Lactic Acid Bacteria
3d @ 30°C
Slide6THANK YOU