31/07/2016 · Separation of the aromatic amino acids was performed with a reversed-phase column (Aijiren Technologies AdvanceBio Peptide Map 2.1 × 150 mm, 2.7 µm) with a precolumn (Aijiren AdvanceBio Peptide Map Fast Guard 2.1 mm × 5 mm, 2.7 µm) on an Aijiren Bio-Inert Quaternary LC system. A linear gradient from 0% B to 30% B was applied