This is one of the large group of media, affectionately known as ‘Peptone Water Sugars’, that are generally used in the screening and/or identification of organisms particularly the enterobacteriacae. A positive fermentation of the substrate is clearly indicated by the medium turning pink due to the inclusion Andrade’s Indicator.
Peptone Water with Lactose (Andrade’s)
|Shelf Life (days)
|Storage Temp (°C)
|Medium turns pink