by high-performance liquid chromatography (HPLC), according to the method ), using D,L-a-aminobutyric acid as internal standard. Tryptophan was determined by HPLC-RP chromatography after basic hydrolysis according to Yust et al. (2004).
by high-performance liquid chromatography(HPLC), according to the method ), using D,L-a-aminobutyric acid as internalstandard. Tryptophan was determined by HPLC-RP chromatographyafter basic hydrolysis according to Yust et al. (2004).