50X Tryptophan
7.5 g/L
Dissolve 1.875 g Tryptophan in 250 mL of distilled water (reserve some water to rinse the sides of the beaker). Leave it on the stir plate for a while. It's powdery and resistant to going into solution.
Filter sterilize.
Store in the dark at 4 ˚C.
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