It mainly provides microbial growth factors, vitamins and other substances, but it contains 10~ 15% nitrogen and 10% carbohydrate, and its functions are complex, so it can't be simply said to be carbon and nitrogen or anything else.

Tryptone, which mainly provides nitrogen source, has many special amino acids, so it will be chosen as the main nitrogen source.

sodium chloride

Its main function is to provide microbial growth environment, osmotic pressure and then inorganic salt ions.