TTC lactose agar

TTC lactose agar

TTC lactose agar is a selective and differential medium, which is mainly used for rapid detection and counting of coliforms. Its basic components provide nutrition, and bile salts can inhibit the growth of gram-positive bacteria. Lactose is the key component as fermentable carbon source, and TTC(2,3,5- triphenyltetrazole chloride) is the redox indicator. When the coliform bacteria ferment lactose to produce acid, the surrounding of the colony turns yellow; At the same time, the bacteria reduced the colorless TTC to insoluble red armor, which made the typical colony appear red in the center and yellow around it. The chromogenic reaction is easy to observe and is widely used for hygienic microbiological examination of food and water quality.

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