Lactic Acid Bacteria

Lactic Acid Bacteria Lactic Acid Bacteria - Start

2016-05-20 168K 168 0 0

Lactic Acid Bacteria - Description

Hopkins Microbiology Course 2010. 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. ID: 327672 Download Presentation

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Lactic Acid Bacteria




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Presentations text content in Lactic Acid Bacteria

Slide1

Lactic Acid Bacteria

Hopkins Microbiology Course 2010

Marcus

Schicklberger

Slide2

Lactic Acid Bacteria

Gram positiveNon-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

Slide3

homofermentative

heterofermentative

Slide4

Lactic 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

.

Slide5

pH

initial

= 6.0

pH

final

= 4.2

plate cabbage juice on glucose-CaCO3 plates

O

2 O2- H2O2 H2O+O2

e

-

e

-

catalase

CaCO

2

Ca

2

++CO32- HCO3- H2CO3

H

2

O+CO

2

H

+

H

+

Isolation of Lactic Acid Bacteria

3d @ 30°C

Slide6

THANK YOU

Slide7

Slide8

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