Greetings all.

As you probably know the "Tryptone" used as component of LB media and alike are the product of digestion of casein. Similarly Cas-Amino acids are the product of acidic hydrolysis of casein.

Given the above, and knowing that casein is highly phosphorylated I am trying to understand if the peptides in Tryptone and the amino acids in "Cas-Amino acids" are also phosphorylated.

Many thanks

Yoram