Characteristics

LAB-A

LAB-B

Colony Color

White

Creamy White

Colony Shape

As a surface colony, they are Small, irregular,

Cottony-fluffy colonies

As a surface colony, they are Large, Circular, Lenticular colonies in middle of the medium

Surface

Rough

Smooth

Elevation

Convex to umbonate

Raised

Margin

Undulate

Entire

Gram staining

+

+

Catalase test

Milk coagulation test

+

+

NaCl tolerance test

1.5%

+

+

2.5%

+

3.5%

+

4.5%

Possibility of strains

L. acidophilus

L. bulgaricus