What is this for?
designed to grow Gram-negative bacteria and stain them for lactose fermentation.
distinguishes those Gram-negative bacteria that can ferment the sugar lactose from those that cannot
Contents
It contains :
The concept :
designed to grow Gram-negative bacteria and stain them for lactose fermentation.
distinguishes those Gram-negative bacteria that can ferment the sugar lactose from those that cannot
Contents
It contains :
- bile salts and crystal violet dye to inhibit most Gram-positive bacteria
- neutral red dye to stains microbes fermenting lactose
- lactose and peptone.
The concept :
- bacteria that can ferment sugar lactose will produce acid
- lowers the pH
- appearance of red/pink colonies.
- bacteria that cannot ferment sugar lactose will use peptone
- producing ammonia
- raise pH
- appearance of white / colourless colonies
Macconkey agar with lactose (left) and non-lactose (right) fermenters