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Bifidobacterium longum

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Rod-shape, gram-positive, catalase-negative bacteria that are consider as an aerotolerant anaerobe which happen to colonize earlier in the gastrointestinal tract of infants.


Bifidobacterium longum in a culture media appears to be white glossy colonies with a convex shape. It is absent in adult intestinal tract yet it is found in the gut for the production of lactic acid to avert growth of pathogenic microorganisms. It comprises at about 90% on an infant’s gastrointestinal tract and slowly drops in adults since other important microflora tend to dominate like Eubacterium and Bacteriodes. It is recognized in the gut by the glycoprotein-binding fimbriae structures and bacterial polysaccharides that has an electrostatic charge to aid adhesion in theintestinal endothelial cells.

Bifidobacterium longum is used as a good source of probiotic in many dairy products that helps to maintain and sustain human gastrointestinal tract. It is associated on some health benefits like improving lactose tolerance, food allergies, preventing diarrhea and hindering pathogen growth. It is also verified to have an antioxidative effect through restraining linoleic acid peroxidation and lowering the possibility to have stroke and atherosclerosis.

It has been revealed that probiotic bacteria Bifidobacterium longum are effective for the treatment of allergic diseases. Ashistamine plays a central role in allergic diseases and are possible that probiotic bacteria affects the allergy-related histamine signaling, thereby oral administration of Bifidobacterium longum suppressed gene expression followed by the decrease of protein level and histamine content.

Scientific Classification:

 Phylum: Actinobacteria
 Class: Actinobacteria 
 Subclass: Actinobacteridae
 Order: Bifidobacteriales
 Family: Bifidobacteriaceae
 Genus: Bifidobacterium
 Species: Bifidobacterium infantis 

See also:


lactic acid bacteria