LC-PDA C18 column (250 mm × 4.6 mm; 5 μm) was used together with a C18 (25 mm × 4.6 mm; 5 μm) guard column Mobile phase: (A) Acetonitrile/methanol 20:80, v/v mixture and (B) 1% (M/V) ammonium acetate (pH) 7.5; gradient elution
LC-PDA C18 column (250 mm × 4.6 mm; 5 μm) was used together with a C18 (25 mm × 4.6 mm; 5 μm) guard column Mobile phase: (A) Acetonitrile/methanol 20:80, v/v mixture and (B) 1% (M/V) ammonium acetate (pH) 7.5; gradient elution