L-serine (l-ser) is an amino acid important for its roles in synthesizing other amino acids and for its use in intravenous feeding solutions. it is often synthesized commercially by fermentation, recovered by subjecting the fermentation broth to several processing steps, and then crystallizing the serine from an aqueous solution. the solubility x (in mg/l) of l-serine in water have been measured at several temperatures, producing the following data.