Effect of 11 commercially available food
coloring dyes was tested on referent bacterial strains:
Staphylococcus aureus ATCC 25923, Pseudomona
aeruginosa ATCC 27853, Escherichia coli ATCC 25922
and Enterococcus faecalis ATCC 29212.
Mueller-Hinton agar was used as media for bacterial
growth to which different concentration of food coloring
dyes were added. Two different types of food coloring
dyes were used, powder and gel. The results indicated
that different food dyes have different effect on
bacterial growth due to difference in their ingredients,
such as sugars, coloring and emulsifiers. Difference in
growth, on media containing food coloring dyes, was
also noticed between Gram-negative and Gram-positive
Keywords : Food Coloring Dyes; Bacteria; Emulsifiers; Sugar; S.Aureus; P.Aeruginosa; E.Coli; E.Faecalis.