

This medium utilizes the ability of Salmonella spp. to produce acid from propylene glycol. This characteristic is used in conjunction with a chromogenic indicator to differentiate Salmonella spp. form Proteus spp. and other Enterobacteriaceae.
Salmonella spp., including S.typhi and S.paratyphi A, produce pink to magenta colonies as a result of propylene glycol utilization. Members of the family Enterobacteriaceae produce blue, blue-green, white, or colorless colonies, while Gram-positive bacteria and non-glucose fermenting bacteria will be inhibited.
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